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Low Power Audio Codec SSM2604
FEATURES
Stereo, 24-bit analog-to-digital and digital-to-analog converters DAC SNR: 100 dB (A-weighted), THD: -80 dB at 48 kHz, 3.3 V ADC SNR: 90 dB (A-weighted), THD: -80 dB at 48 kHz, 3.3 V Stereo line inputs Low power 7 mW stereo playback (1.8 V/1.5 V supplies) 14 mW record and playback (1.8 V/1.5 V supplies) Low supply voltages Analog: 1.8 V to 3.6 V Digital: 1.5 V to 3.6 V 256/384 oversampling rate in normal mode; 250/272 oversampling rate in USB mode Audio sampling rates: 8 kHz, 11.025 kHz, 12 kHz, 16 kHz, 22.05 kHz, 24 kHz, 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz 20-lead, 4 mm x 4 mm LFCSP (QFN) package
GENERAL DESCRIPTION
The SSM2604 is a low power, high quality stereo audio codec for portable digital audio applications with one set of stereo programmable gain amplifier (PGA) line inputs. It features two 24-bit analog-to-digital converter (ADC) channels and two 24-bit digital-to-analog (DAC) converter channels. The SSM2604 can operate as a master or a slave. It supports various master clock frequencies, including 12 MHz or 24 MHz for USB devices; standard 256 fS or 384 fS based rates, such as 12.288 MHz and 24.576 MHz; and many common audio sampling rates, such as 96 kHz, 88.2 kHz, 48 kHz, 44.1 kHz, 32 kHz, 24 kHz, 22.05 kHz, 16 kHz, 12 kHz, 11.025 kHz, and 8 kHz. The SSM2604 can operate at power supplies as low as 1.8 V for the analog circuitry and as low as 1.5 V for the digital circuitry. The maximum voltage supply is 3.6 V for all supplies. The SSM2604 is specified over the industrial temperature range of -40C to +85C. It is available in a 20-lead, 4 mm x 4 mm lead frame chip scale package (LFCSP).
APPLICATIONS
Mobile phones MP3 players Portable gaming Portable electronics Educational toys
AVDD VMID AGND DVDD DGND
FUNCTIONAL BLOCK DIAGRAM
SSM2604
BYPASS
-34.5dB TO +33dB, 1.5dB STEP
RLINEIN
ADC
DAC
ROUT
DIGITAL PROCESSOR
LLINEIN
-34.5dB TO +33dB, 1.5dB STEP
ADC
DAC
LOUT
BYPASS CLK DIGITAL AUDIO INTERFACE CONTROL INTERFACE
MCLK/ XTO CLKOUT XTI
PBDAT RECDAT BCLK PBLRC RECLRC SDIN
SCLK
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2008 Analog Devices, Inc. All rights reserved.
06978-001
SSM2604 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Digital Filter Characteristics ....................................................... 4 Timing Characteristics ................................................................ 5 Absolute Maximum Ratings............................................................ 7 Thermal Resistance ...................................................................... 7 ESD Caution .................................................................................. 7 Pin Configuration and Function Descriptions ............................. 8 Typical Performance Characteristics ............................................. 9 Converter Filter Response ........................................................... 9 Digital De-Emphasis .................................................................. 10 Theory of Operation ...................................................................... 11 Digital Core ................................................................................. 11 ADC and DAC ............................................................................ 11 ADC High-Pass and DAC De-Emphasis Filters .................... 11 Analog Interface ......................................................................... 12 Digital Audio Interface .............................................................. 12 Software Control Interface ........................................................ 15 Typical Application Circuits ......................................................... 16 Register Map ................................................................................... 17 Register Map Details ...................................................................... 18 Left-Channel ADC Input Volume, Address 0x00 .................. 18 Right-Channel ADC Input Volume, Address 0x01 ............... 19 Analog Audio Path, Address 0x04 ........................................... 20 Digital Audio Path, Address 0x05 ............................................ 20 Power Management, Address 0x06 .......................................... 21 Digital Audio I/F, Address 0x07 ............................................... 22 Sampling Rate, Address 0x08.................................................... 22 Active, Address 0x09 .................................................................. 25 Software Reset, Address 0x0F ................................................... 25 Outline Dimensions ....................................................................... 26 Ordering Guide .......................................................................... 26
REVISION HISTORY
7/08--Revision 0: Initial Version
Rev. 0 | Page 2 of 28
SSM2604 SPECIFICATIONS
TA = 25C, AVDD = DVDD = 3.3 V, 1 kHz signal, fS = 48 kHz, PGA gain = 0 dB, 24-bit audio data, unless otherwise noted. Table 1.
Parameter RECOMMENDED OPERATING CONDITIONS Analog Voltage Supply (AVDD) Digital Power Supply Ground (AGND, DGND) POWER CONSUMPTION Power-Up Stereo Record (1.5 V and 1.8 V) Stereo Record (3.3 V) Stereo Playback (1.5 V and 1.8 V) Stereo Playback (3.3 V) Power-Down LINE INPUT Input Signal Level (0 dB) Input Impedance Min 1.8 1.5 Typ 3.3 3.3 0 Max 3.6 3.6 Unit V V V Conditions
7 22 7 22 56 1 x AVDD/3.3 200 10 480 10 90 84 -80 -75 80 0 1.5 -80
mW mW mW mW W V rms k k k pF dB dB dB dB dB dB dB dB
PGA gain = 0 dB PGA gain = +33 dB PGA gain = -34.5 dB PGA gain = 0 dB, AVDD = 3.3 V PGA gain = 0 dB, AVDD = 1.8 V -1 dBFS input, AVDD = 3.3 V -1 dBFS input, AVDD = 1.8 V
Input Capacitance Signal-to-Noise Ratio (A-Weighted) Total Harmonic Distortion (THD) Channel Separation Programmable Gain Gain Step Mute Attenuation LINE OUTPUT DAC Full-Scale Output Signal-to-Noise Ratio (A-Weighted) THD + N Power Supply Rejection Ratio Channel Separation LINE INPUT TO LINE OUTPUT Full-Scale Output Voltage Signal-to-Noise Ratio (A-Weighted) Total Harmonic Distortion Power Supply Rejection
70
-34.5
+33.5
-1 dBFS input DAC + line output 85 1 x AVDD/3.3 100 94 -80 -75 50 80 1 x AVDD/3.3 92 86 -80 -80 50 V rms dB dB dB dB dB dB V rms dB dB dB dB dB AVDD = 3.3 V AVDD = 1.8 V AVDD = 3.3 V AVDD = 1.8 V
-75
AVDD = 3.3 V AVDD = 1.8 V AVDD = 3.3 V AVDD = 1.8 V
Rev. 0 | Page 3 of 28
SSM2604
DIGITAL FILTER CHARACTERISTICS
Table 2.
Parameter ADC FILTER Pass Band Pass-Band Ripple Stop Band Stop-Band Attenuation High-Pass Filter Corner Frequency Min 0 0.5 fS 0.04 0.555 fS -61 3.7 10.4 21.6 0 0.5 fS Pass-Band Ripple Stop Band Stop-Band Attenuation CORE CLOCK TOLERANCE Frequency Range Jitter Tolerance 0.04 0.555 fS -61 8.0 50 13.8 0.445 fS Typ Max 0.445 fS Unit Hz Hz dB Hz dB Hz Hz Hz Hz Hz dB Hz dB MHz ps Conditions 0.04 dB -6 dB
f > 0.567 fS -3 dB -0.5 dB -0.1 dB 0.04 dB -6 dB
DAC FILTER Pass Band
f > 0.565 fS
Rev. 0 | Page 4 of 28
SSM2604
TIMING CHARACTERISTICS
Table 3. I2C Timing
Parameter tSCS tSCH tPH tPL fSCLK tDS tDH tRT tFT tHCS tMIN 600 600 600 1.3 0 100 Limit tMAX Unit ns ns ns s kHz ns ns ns ns ns
tSCH tPL
SCLK
526 900 300 300
600
Description Start condition setup time Start condition hold time SCLK pulse width high SCLK pulse width low SCLK frequency Data setup time Data hold time SDIN and SCLK rise time SDIN and SCLK fall time Stop condition setup time
SDIN
tHCS tDS tPH tDH tFT tSCS
06978-036
06978-025
tRT
2
Figure 2. I C Timing
Table 4. Digital Audio Interface Slave Mode Timing
Parameter tDS tDH tLRSU tLRH tDD tBCH tBCL tBCY tMIN 10 10 10 10 25 25 50 Limit tMAX Unit ns ns ns ns ns ns ns ns
tBCH
BCLK PBLRC/ RECLRC
30
Description PBDAT setup time from BCLK rising edge PBDAT hold time from BCLK rising edge RECLRC/PBLRC setup time to BCLK rising edge RECLRC/PBLRC hold time to BCLK rising edge RECDAT propagation delay from BCLK falling edge (external load of 70 pF) BCLK pulse width high BCLK pulse width low BCLK cycle time
tBCL
tBCY
tDS tLRH
PBDAT
tLRSU tDH
tDD
RECDAT
Figure 3. Digital Audio Interface Slave Mode Timing
Rev. 0 | Page 5 of 28
SSM2604
Table 5. Digital Audio Interface Master Mode Timing
Parameter tDST tDHT tDL tDDA tBCLKR tBCLKF tBCLKDS tMIN 30 10 Limit tMAX Unit ns ns ns ns ns ns Description PBDAT setup time to BCLK rising edge PBDAT hold time to BCLK rising edge RECLRC/PBLRC propagation delay from BCLK falling edge RECDAT propagation delay from BCLK falling edge BCLK rising time (10 pF load) BCLK falling time (10 pF load) BCLK duty cycle (normal and USB mode)
10 10 10 10 45:55:00
55:45:00
BCLK
tDL
PBLRC/ RECLRC PBDAT
06978-026
tDST
tDHT
tDDA
RECDAT
Figure 4. Digital Audio Interface Master Mode Timing
Table 6. System Clock Timing
Parameter tXTIY tMCLKDS tXTIH tXTIL tCOP tCOPDIV2 tMIN 72 40:60 32 32 20 20 Limit tMAX 60:40:00 ns ns ns ns Unit ns Description MCLK/XTI system clock cycle time MCLK/XTI duty cycle MCLK/XTI system clock pulse width high MCLK/XTI system clock pulse width low CLKOUT propagation delay from MCLK/XTI falling edge CLKODIV2 propagation delay from MCLK/XTI falling edge
tXTIH
MCLK/XTI
tCOP tXTIL tXTIY
CLKOUT CLKODIV2 tCOPDIV2
Figure 5. System (MCLK) Clock Timing
Rev. 0 | Page 6 of 28
06978-035
SSM2604 ABSOLUTE MAXIMUM RATINGS
At 25C, unless otherwise noted. Table 7.
Parameter Supply Voltage Input Voltage Common-Mode Input Voltage Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering, 60 sec) Rating 3.6 V VDD VDD -65C to +150C -40C to +85C -65C to +165C 300C
THERMAL RESISTANCE
JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 8. Thermal Resistance
Package Type 20-Lead, 4 mm x 4 mm LFCSP JA 28 JC 32 Unit C/W
ESD CAUTION
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Rev. 0 | Page 7 of 28
SSM2604 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
20 19 18 17 16
PIN 1 INDICATOR
NC SCLK SDIN LLINEIN RLINEIN
MCLK/XTI XTO DGND DVDD CLKOUT
1 2 3 4 5
SSM2604
TOP VIEW (Not to Scale)
15 14 13 12 11
VMID AGND AVDD ROUT LOUT
Figure 6. Pin Configuration
Table 9. Pin Function Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Mnemonic MCLK/XTI XTO DGND DVDD CLKOUT BCLK PBDAT PBLRC RECDAT RECLRC LOUT ROUT AVDD AGND VMID RLINEIN LLINEIN SDIN SCLK NC GND Pad Type Digital Input Digital Output Digital Ground Digital Supply Digital Output Digital Input/Output Digital Input Digital Input/Output Digital Output Digital Input/Output Analog Output Analog Output Analog Supply Analog Ground Analog Output Analog Input Analog Input Digital Input/Output Digital Input NC Thermal Pad/Exposed Pad Description Master Clock Input/Crystal Input. Crystal Output. Digital Ground. Digital Core and I/O Buffer Supply. Buffered Clock Output. Digital Audio Bit Clock. DAC Digital Audio Data Input, Playback Function. DAC Sampling Rate Clock, Playback Function (from Left and Right Channels). ADC Digital Audio Data Output, Record Function. ADC Sampling Rate Clock, Record Function (from Left and Right Channels). Line Output for Left Channel. Line Output for Right Channel. Analog Supply. Analog Ground. Midrail Voltage Decoupling Input. Line Input for Right Channel. Line Input for Left Channel. 2-Wire Control Interface Data Input/Output. 2-Wire Control Interface Clock Input. No Connection Center Thermal Pad. Connect to PCB ground layer.
Rev. 0 | Page 8 of 28
06978-002
NOTES 1. NC = NO CONNECT. 2. FOR PROPER CONNECTION OF THE EXPOSED PAD, CONNECT TO PCB GROUND LAYER
BCLK 6 PBDAT 7 PBLRC 8 RECDAT 9 RECLRC 10
SSM2604 TYPICAL PERFORMANCE CHARACTERISTICS
CONVERTER FILTER RESPONSE
0 -10 -20 0 -10 -20
MAGNITUDE (dB)
MAGNITUDE (dB)
-30 -40 -50 -60 -70 -80 -90 -100
06978-003
-30 -40 -50 -60 -70 -80 -90
06978-005 06978-006
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
-100
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
FREQUENCY (fS)
FREQUENCY (fS)
Figure 7. ADC Digital Filter Frequency Response
Figure 9. DAC Digital Filter Frequency Response
0.05 0.04 0.03 0.02
MAGNITUDE (dB)
0.05 0.04 0.03 0.02
0.01 0 -0.01 -0.02 -0.03 -0.04 -0.05
06978-004
MAGNITUDE (dB)
0.01 0 -0.01 -0.02 -0.03 -0.04
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
-0.05
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
FREQUENCY (fS)
FREQUENCY (fS)
Figure 8. ADC Digital Filter Ripple
Figure 10. DAC Digital Filter Ripple
Rev. 0 | Page 9 of 28
SSM2604
DIGITAL DE-EMPHASIS
0 -1 -2 0.2 -3 0.4 0.3
MAGNITUDE (dB)
MAGNITUDE (dB)
06978-007
-4 -5 -6 -7 -8 -9 -10 0 4 8 FREQUENCY (kHz) 12 16
0.1 0 -0.1 -0.2 -0.3 -0.4
0
4
8
12
16
20
FREQUENCY (kHz)
Figure 11. De-Emphasis Frequency Response, Audio Sampling Rate = 32 kHz
Figure 14. De-Emphasis Error, Audio Sampling Rate = 44.1 kHz
0.4 0.3 0.2
MAGNITUDE (dB)
0 -1 -2 -3
0.1 0 -0.1 -0.2 -0.3 -0.4
MAGNITUDE (dB)
-4 -5 -6 -7 -8 -9
0
4
8 FREQUENCY (kHz)
12
16
06978-008
0
4
8
12 FREQUENCY (kHz)
16
20
24
Figure 12. De-Emphasis Error, Audio Sampling Rate = 32 kHz
Figure 15. De-Emphasis Frequency Response, Audio Sampling Rate = 48 kHz
0 -1 -2 -3
MAGNITUDE (dB)
0.4 0.3 0.2
MAGNITUDE (dB)
-4 -5 -6 -7 -8 -9 0 4 8 12 16 20
06978-009
0.1 0 -0.1 -0.2 -0.3 -0.4
0
4
8
12 FREQUENCY (kHz)
16
20
24
FREQUENCY (kHz)
Figure 13. De-Emphasis Frequency Response, Audio Sampling Rate = 44.1 kHz
Figure 16. De-Emphasis Error, Audio Sampling Rate = 48 kHz
Rev. 0 | Page 10 of 28
06978-012
-10
06978-011
-10
06978-010
SSM2604 THEORY OF OPERATION
DIGITAL CORE
Inside the SSM2604 digital core is a central clock source, called the master clock (MCLK), that produces a reference clock for all internal audio data processing and synchronization. When using an external clock source to drive the MCLK pin, great care should be taken to select a clock source with less than 50 ps of jitter. Without careful generation of the MCLK signal, the digital audio quality likely suffers. To enable the SSM2604 to generate the central reference clock in a system, connect a crystal oscillator between the MCLK/XTI input pin and the XTO output pin. To allow an external device to generate the central reference clock, apply the external clock signal directly through the MCLK/ XTI input pin. In this configuration, the oscillator circuit of the SSM2604 can be powered down by using the OSC bit (Register R6, Bit D5) to reduce power consumption. To accommodate applications with very high frequency master clocks, the internal core reference clock of the SSM2604 can be set to either MCLK or MCLK divided by 2. This is enabled by adjusting the setting of the CLKDIV2 bit (Register R8, Bit D6). Complementary to this feature, the CLKOUT pin can also drive external clock sources with either the core clock signal or the core clock divided by 2 by enabling the CLKODIV2 bit (Register R8, Bit D7). The ADC accepts analog audio input from the stereo line inputs. The digital data from the ADC output, once converted, is processed using the ADC filters. Complementary to the ADC channels, the SSM2604 contains a pair of oversampling - DACs that convert the digital audio data from the internal DAC filters into an analog audio signal. The DAC output can also be muted by setting the DACMU bit (Register R5, Bit D3) in the control register.
ADC HIGH-PASS AND DAC DE-EMPHASIS FILTERS
The ADC and DAC employ separate digital filters that perform 24-bit signal processing. The digital filters are used for both record and playback modes and are optimized for each individual sampling rate used. For recording mode operations, the unprocessed data from the ADC enters the ADC filters and is converted to the appropriate sampling frequency, and then is output to the digital audio interface. For playback mode operations, the DAC filters convert the digital audio interface data to oversampled data, using a sampling rate selected by the user. The oversampled data is processed by the DAC and then is sent to the analog output mixer by enabling the DACSEL (Register R4, Bit D4). Users have the option of setting up the device so that any dc offset in the input source signal is automatically detected and removed. To accomplish this, enable the digital high-pass filter (see Table 2 for characteristics) contained in the ADC digital filters by using the ADCHPF bit (Register R5, Bit D0). In addition, users can implement digital de-emphasis by using the DEEMPH bits (Register R5, Bit D1 and Bit D2).
ADC AND DAC
The SSM2604 contains a pair of oversampling - ADCs. The maximum ADC full-scale input level is 1.0 V rms when AVDD = 3.3 V. If the input signal to the ADC exceeds this level, data overloading occurs and causes audible distortion.
Rev. 0 | Page 11 of 28
SSM2604
ANALOG INTERFACE
Signal Chain
The SSM2604 includes stereo single-ended line inputs to the on-board ADC. In addition, the line inputs can be routed and mixed directly to the output terminals via the BYPASS bit (Register R4, Bit D3). The SSM2604 also includes line outputs from the on-board DAC.
LINE INPUT BYPASS
DACSEL DAC OUTPUT LINE OUTPUT
AVDD
Stereo Line Inputs
The SSM2604 contains a set of single-ended stereo line inputs (RLINEIN and LLINEIN) that are internally biased to VMID by way of a voltage divider between AVDD and AGND. The line input signal can be connected to the internal ADC and, if desired, routed directly to the outputs via the bypass path by using the BYPASS bit (Register R4, Bit D3).
LINEIN VMID
AGND
Figure 18. Output Signal Chain
AVDD
The maximum output level of the line outputs is 1.0 V rms when AVDD and HPVDD = 3.3 V. To suppress audible pops and clicks, the line outputs are held at the VMID dc voltage level when the device is set to standby mode.
- + ADC OR BYPASS
VMID
AGND
06978-031
The stereo line outputs of the SSM2604, the LOUT and ROUT pins, are able to drive a load impedance of 10 k and 50 pF. The line output signal levels are not adjustable at the output mixer, having a fixed gain of 0 dB.
Figure 17. Line Input to ADC
DIGITAL AUDIO INTERFACE
The digital audio input can support the following four digital audio communication protocols: right-justified mode, left-justified mode, I2S mode, and digital signal processor (DSP) mode. The mode selection is performed by writing to the FORMAT bits of the digital audio interface register (Register R7, Bit D1 and Bit D0). All modes are MSB first and operate with data of 16 to 32 bits.
The line input volume can be adjusted from -34.5 dB to +33 dB in steps of +1.5 dB by setting the LINVOL (Register R0, Bit D0 to Bit D5) and RINVOL (Register R1, Bit D0 to Bit D5) bits. Volume control, by default, is independently adjustable on both right and left line inputs. However, the LRINBOTH or RLINBOTH bit, if selected, simultaneously loads both sets of volume control with the same value. The user can also set the LINMUTE (Register R0, Bit D7) and RINMUTE (Register R1, Bit D7) bits to mute the line input signal to the ADC. Note that when sourcing audio data from line inputs, the maximum full-scale input of the ADC is 1.0 V rms when AVDD = 3.3 V. Do not source any input voltage larger than full scale to avoid overloading the ADC, which causes distortion of sound and deterioration of audio quality. For best sound quality in line inputs, gain should be carefully configured so that the ADC receives a signal equal to its full scale. This maximizes the signal-to-noise ratio for best total audio quality.
Recording Mode
On the RECDAT output pin, the digital audio interface can send digital audio data for recording mode operation. The digital audio interface outputs the processed internal ADC digital filter data onto the RECDAT output. The digital audio data stream on RECDAT comprises left- and right-channel audio data that is time domain multiplexed. The RECLRC is the digital audio frame clock signal that separates left- and right-channel data on the RECDAT lines. The BCLK signal acts as the digital audio clock. Depending on if the SSM2604 is in master or slave mode, the BCLK signal is either an input or an output signal. During a recording operation, RECDAT and RECLRC must be synchronous to the BCLK signal to avoid data corruption.
Bypass Path to Output
The line inputs can be routed and mixed directly to the output terminals via the BYPASS (Register R4, Bit D3) software control register selection. The analog input signal is routed directly to the output terminals and is not digitally converted. The bypass signal at the output mixer is the same level as the output of the PGA associated with each line input.
Playback Mode
On the PBDAT input pin, the digital audio interface can receive digital audio data for playback mode operation. The digital audio data stream on PBDAT comprises left- and right-channel audio data that is time domain multiplexed. The PBLRC is the digital
Line Outputs
The DAC outputs and the line inputs (the bypass path) are summed at an output mixer.
Rev. 0 | Page 12 of 28
06978-033
SSM2604
audio frame clock signal that separates left- and right-channel data on the PBDAT lines. The BCLK signal acts as the digital audio clock. Depending on if the SSM2604 is in master or slave mode, the BCLK signal is either an input or an output signal. During a playback operation, PBDAT and PBLRC must be synchronous to the BCLK signal to avoid data corruption. SSM2604 to support the common universal serial bus (USB) clock rate of 12 MHz, or to support 24 MHz if the CLKDIV2 control register bit is activated. The user must set the appropriate sampling rate in the SR control bits (Register R8, Bit D2 to Bit D5). See Table 25 and Table 26 for guidelines. Note that the sampling rate is generated as a fixed divider from the MCLK signal. Because all audio processing references the core MCLK signal, corruption of this signal, in turn, corrupts the outgoing audio quality of the SSM2604. The BCLK/RECLRC/ RECDAT or BCLK/PBLRC/PBDAT signals must be synchronized with MCLK in the digital audio interface circuit. MCLK must be faster or equal to the BCLK frequency to guarantee that no data is lost during data synchronization. The BCLK frequency should be greater than Sampling Rate x Word Length x 2 Ensuring that the BCLK frequency is greater than this value guarantees that all valid data bits are captured by the digital audio interface circuitry. For example, if a 32 kHz digital audio sampling rate with a 32-bit word length is desired, BCLK 2.048 MHz.
Digital Audio Data Sampling Rate
To accommodate a wide variety of commonly used DAC and ADC sampling rates, the SSM2604 allows for two modes of operation, normal and USB, selected by the USB bit (Register R8, Bit D0). In normal mode, the SSM2604 supports digital audio sampling rates from 8 kHz to 96 kHz. Normal mode supports 256 fS and 384 fS based clocks. To select the desired sampling rate, the user must set the appropriate sampling rate register in the SR control bits (Register R8, Bit D2 to Bit D5) and match this selection to the core clock frequency that is pulsed on the MCLK pin. See Table 25 and Table 26 for guidelines. In USB mode, the SSM2604 supports digital audio sampling rates from 8 kHz to 96 kHz. USB mode is enabled on the
1/fS LEFT CHANNEL RECLRC/ PBLRC RIGHT CHANNEL
BCLK
RECDAT/ PBDAT X = DON'T CARE.
1
2
3
4
N
X
X
1
2
3
N
X
X
06978-013
Figure 19. Left-Justified Audio Input Mode
1/fS LEFT CHANNEL RECLRC/ PBLRC RIGHT CHANNEL
BCLK
RECDAT/ PBDAT
X
X
N
4
3
2
1
X
X
N
4
3
2
1
06978-014
X = DON'T CARE.
Figure 20. Right-Justified Audio Input Mode
Rev. 0 | Page 13 of 28
SSM2604
1/fS LEFT CHANNEL RIGHT CHANNEL
RECLRC/ PBLRC
BCLK
RECDAT/ PBDAT
X
1
2
3
4
N
X
X
1
2
3
N
X
X = DON'T CARE.
Figure 21. I2S Audio Input Mode
1/fS LEFT CHANNEL RECLRC/ PBLRC RIGHT CHANNEL
BCLK
RECDAT/ PBDAT X = DON'T CARE.
1
2
3
N
1
2
3
N
X
X
X
06978-016
Figure 22. DSP/Pulse Code Modulation (PCM) Mode Audio Input Submode 1 (SM1) [Bit LRP = 0]
1/fS LEFT CHANNEL RECLRC/ PBLRC RIGHT CHANNEL
BCLK
RECDAT/ PBDAT X = DON'T CARE.
X
1
2
3
N
1
2
3
N
X
X
06978-017
Figure 23. DSP/PCM Mode Audio Input Submode 2 (SM2) [Bit LRP = 1]
Rev. 0 | Page 14 of 28
06978-015
SSM2604
SOFTWARE CONTROL INTERFACE
The software control interface provides access to the userselectable control registers and can operate with a 2-wire (I2C(R)) interface. Within each control register is a control data-word consisting of 16 bits, MSB first. Bit D15 to Bit D9 are the register map address, and Bit D8 to Bit D0 are register data for the associated register map. SDIN generates the serial control data-word; SCLK clocks the serial data, The device address for the SSM2604 is 0011010.
SDIN
1 TO 7
8 R/W
9 ACK
1 TO 7
8
9 ACK
1 TO 7
8
9 ACK
P STOP
START
ADDR
SUBADDRESS
DATA
Figure 24. 2-Wire I2C Generalized Clocking Diagram
WRITE SEQUENCE
S
A7
...
A1
A0 0
A(S)
D15 ...
D9
D8
A(S)
D7
...
D0
A(S)
P
DEVICE ADDRESS READ SEQUENCE
REGISTER ADDRESS
REGISTER DATA
S
A7
...
A1
A0 0
A(S)
D15
...
D9
0
A(S)
S
A7
...
A1
A0 1
A(S)
D7
...
D0
A(M)
0
06978-019
SCLK
S
...
0
D8
A(M)
P
DEVICE ADDRESS
REGISTER ADDRESS
DEVICE ADDRESS
REGISTER DATA (SLAVE DRIVE)
Figure 25. I2C Write and Read Sequences
Rev. 0 | Page 15 of 28
06978-022
S/P = START/STOP BIT. A0 = I2C R/W BIT. A(S) = ACKNOWLEDGE BY SLAVE. A(M) = ACKNOWLEDGE BY MASTER. A(M) = ACKNOWLEDGE BY MASTER (INVERSION).
SSM2604 TYPICAL APPLICATION CIRCUITS
AVDD VMID AGND DVDD DGND PWROFF
SSM2604
BYPASS
REF
ADC RLINEIN ADC
DAC DAC ROUT
DIGITAL PROCESSOR
LLINEIN LINE
ADC
DAC
LOUT
BYPASS OSC OSC CLKOUT CLK GEN DIGITAL AUDIO INTERFACE CONTROL INTERFACE
MCLK/XTI
XTO
CLKOUT
PBDAT RECDAT BCLK PBLRC RECLRC SDIN
SCLK
Figure 26. Power Management Functional Location Diagram (Control Register R6, Bit D0 to Bit D7)
+3.3V_VA L1 47uH,15mA C1 10uF + +
B1 FB C4 10uF
+3,3V_VD
C2 0.1uF
C3 0.1uF
R1 5.6K L-LINE INPUT R2 NC C6 220PF C5 10M NC 17 C7 R3 5.6K R-LINE INPUT R4 NC C8 220PF 16 1uF I2S[0..4] DACLRC DACDAT ADCDAT ADCLRC BCLK 8 7 9 10 6 10M NC
13
U1
AVDD
DVDD
4
06978-020
1uF
C13 1uF LLINEIN RLINEIN ROUT 12
+
R7 100
J1 BNC 1 1 J2 BNC
LOUT 11
+
SSM2604
PBLRC PBDAT RECDAT RECLRC BCLK
C14 1uF
R5 47K
R6 47K
CLKOUT 5
I2C[0..1]
SDIN SCLK
20 18 19 1
NC SDIN SCLK MCLK/XTI
VMID
15 C12 + 4.7uF C11 0.1uF
Y1
AGND
12.288MHz C9 22pF C10 22pF
14
CONNECTION UNDER CHIP
06978-027
Figure 27. Typical Application Circuit
Rev. 0 | Page 16 of 28
3
DGND
2
PAD
XTO
2
R8 100
2
SSM2604 REGISTER MAP
Table 10. Register Map
Reg. R0 Address 0x00 Name Left-Channel ADC Input Volume Right-Channel ADC Input Volume Reserved Reserved Analog Audio Path Digital Audio Path Power Management Digital Audio I/F Sampling Rate Active Software Reset D8 LRINBOTH D7 LINMUTE D6 0 D5 D4 D3 D2 LINVOL [5:0] D1 D0 Default 010010111
R1
0x01
RLINBOTH
RINMUTE
0
RINVOL [5:0]
010010111
R2 R3 R4 R5 R6 R7 R8 R9 R15
0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0F
0 0 0 0 0 0 0 0
0 0 0 0 PWROFF BCLKINV CLKODIV2 0
0 0 0 0 CLKOUT MS CLKDIV2 0
0 0 0 0 OSC LRSWAP
0 0 DACSEL HPOR 1 LRP
0 0 BYPASS DACMU DAC
0 0 0
0 0 0
0 0 0 ADCHPF LINEIN
000000000 000000000 000001000 000001000 010011111 000001010 000000000 000000000 000000000
DEEMPH [1:0] ADC 1
WL [1:0] SR [3:0]
FORMAT [1:0] BOSR USB ACTIVE
0
0 RESET [8:0]
0
0
0
Rev. 0 | Page 17 of 28
SSM2604 REGISTER MAP DETAILS
LEFT-CHANNEL ADC INPUT VOLUME, ADDRESS 0x00
Table 11. Left-Channel ADC Input Volume Register Bit Map
D8 LRINBOTH D7 LINMUTE D6 0 D5 D4 D3 D2 LINVOL [5:0] D1 D0
Table 12. Descriptions of Left-Channel ADC Input Volume Register Bits
Bit Name LRINBOTH Description Left-to-right line input ADC data load control Settings 0 = disable simultaneous loading of left-channel ADC data to rightchannel register (default) 1 = enable simultaneous loading of left-channel ADC data to rightchannel register 0 = disable mute 1 = enable mute on data path to ADC (default) 00 0000 = -34.5 dB ... 1.5 dB step up 01 0111 = 0 dB (default) ... 1.5 dB step up 01 1111 = 12 dB 10 0000 = 13.5 dB 10 0001 = 15 dB 10 0010 = 16.5 dB 10 0011 = 18 dB 10 0100 = 19.5 dB 10 0101 = 21 dB 10 0110 = 22.5 dB 10 0111 = 24 dB 10 1000 = 25.5 dB 10 1001 = 27 dB 10 1010 = 28.5 dB 10 1011 = 30 dB 10 1100 = 31.5 dB 10 1101 = 33 dB 11 1111 to 10 1101 = 33 dB
LINMUTE LINVOL [5:0]
Left-channel input mute Left-channel PGA volume control
Rev. 0 | Page 18 of 28
SSM2604
RIGHT-CHANNEL ADC INPUT VOLUME, ADDRESS 0x01
Table 13. Right-Channel ADC Input Volume Register Bit Map
D8 RLINBOTH D7 RINMUTE D6 0 D5 D4 D3 D2 RINVOL [5:0] D1 D0
Table 14. Descriptions of Right-Channel ADC Input Volume Register Bits
Bit Name RLINBOTH Description Right-to-left line input ADC data load control Settings 0 = disable simultaneous loading of right-channel ADC data to leftchannel register (default) 1 = enable simultaneous loading of right-channel ADC data to leftchannel register 0 = disable mute 1 = enable mute on data path to ADC (default) 00 0000 = -34.5 dB ... 1.5 dB step up 01 0111 = 0 dB (default) ... 1.5 dB step up 01 1111 = 12 dB 10 0000 = 13.5 dB 10 0001 = 15 dB 10 0010 = 16.5 dB 10 0011 = 18 dB 10 0100 = 19.5 dB 10 0101 = 21 dB 10 0110 = 22.5 dB 10 0111 = 24 dB 10 1000 = 25.5 dB 10 1001 = 27 dB 10 1010 = 28.5 dB 10 1011 = 30 dB 10 1100 = 31.5 dB 10 1101 = 33 dB 11 1111 to 10 1101 = 33 dB
RINMUTE RINVOL [5:0]
Right-channel input mute Right-channel PGA volume control
Rev. 0 | Page 19 of 28
SSM2604
ANALOG AUDIO PATH, ADDRESS 0x04
Table 15. Analog Audio Path Register Bit Map
D8 0 D7 0 D6 0 D5 0 D4 DACSEL D3 BYPASS D2 0 D1 0 D0 0
Table 16. Descriptions of Analog Audio Path Register Bits
Bit Name DACSEL BYPASS Description DAC select. Allow DAC output to be mixed at device output terminal. Bypass select. Allow line input signal to be mixed at device output terminal. Settings 0 = do not select DAC (default) 0 = bypass disable
DIGITAL AUDIO PATH, ADDRESS 0x05
Table 17. Digital Audio Path Register Bit Map
D8 0 D7 0 D6 0 D5 0 D4 HPOR D3 DACMU D2 D1 DEEMPH [1:0] D0 ADCHPF
Table 18. Descriptions of Digital Audio Path Register Bits
Bit Name HPOR DACMU DEEMPH [1:0] Description Store dc offset when high-pass filter is disabled DAC digital mute De-emphasis control Settings 0 = clear offset (default) 1 = store offset 0 = no mute (signal active) 1 = mute (default) 00 = no de-emphasis (default) 01 = 32 kHz sampling rate 10 = 44.1 kHz sampling rate 11 = 48 kHz sampling rate 0 = ADC high-pass filter enable (default) 1 = ADC high-pass filter disable
ADCHPF
ADC high-pass filter control
Rev. 0 | Page 20 of 28
SSM2604
POWER MANAGEMENT, ADDRESS 0x06
Table 19. Power Management Register Bit Map
D8 0 D7 PWROFF D6 CLKOUT D5 OSC D4 1 D3 DAC D2 ADC D1 1 D0 LINEIN
Table 20. Description of Power Management Register Bits
Bit Name PWROFF CLKOUT OSC DAC ADC LINEIN Description Whole chip power-down control Clock output power-down control Crystal power-down control DAC power-down control ADC power-down control Line input power-down control Settings 0 = power up 1 = power down (default) 0 = power up (default) 1 = power down 0 = power up (default) 1 = power down 0 = power up 1 = power down (default) 0 = power up 1 = power down (default) 0 = power up 1 = power down (default)
Power Consumption
Table 21.
Mode Record and Playback Playback Only Oscillator Enabled External Clock Record Only Line Clock Line Oscillator Analog Bypass (Line Input or Line Output) External Line Internally Generated Line Power-Down External Clock Oscillator PWROFF 0 0 0 0 0 CLKOUT 0 0 1 0 0 OSC 0 0 1 0 1 DAC 0 0 0 1 1 ADC 0 1 1 0 0 LINEIN 0 1 1 0 0 AVDD (3.3 V) 9.41 4.45 4.56 4.31 4.33 DVDD (3.3 V) 3.7 1.9 1.9 2.0 2.0 Unit mA mA mA mA mA
0 0 1 1
0 0 1 1
1 1 1 1
1 1 1 1
1 1 1 1
0 0 1 1
1.88 1.88 0.002 0.002
0.21 0.25 0.015 0.015
mA mA mA mA
Rev. 0 | Page 21 of 28
SSM2604
DIGITAL AUDIO I/F, ADDRESS 0x07
Table 22. Digital Audio I/F Register Bit Map
D8 0 D7 BCLKINV D6 MS D5 LRSWAP D4 LRP D3 D2 WL [1:0] D1 D0 FORMAT [1:0]
Table 23. Descriptions of Digital Audio I/F Register Bits
Bit Name BCLKINV MS LRSWAP LRP WL [1:0] Description BCLK inversion control Master mode enable Swap DAC data control Polarity control for clocks in right-justified, left-justified, and I2S modes Data-word length control Settings 0 = BCLK not inverted (default) 1 = BCLK inverted 0 = enable slave mode (default) 1 = enable master mode 0 = output left- and right-channel data as normal (default) 1 = swap left- and right-channel DAC data in audio interface 0 = normal PBLRC and RECLRC (default), or DSP Submode 1 1 = invert PBLRC and RECLRC polarity, or DSP Submode 2 00 = 16 bits 01 = 20 bits 10 = 24 bits (default) 11 = 32 bits 00 = right justified 01 = left justified 10 = I2S mode (default) 11 = DSP mode
FORMAT [1:0]
Digital audio input format control
SAMPLING RATE, ADDRESS 0x08
Table 24. Sampling Rate Register Bit Map
D8 0 D7 CLKODIV2 D6 CLKDIV2 D5 D4 D3 SR [3:0] D2 D1 BOSR D0 USB
Table 25. Descriptions of Sampling Rate Register Bits
Bit Name CLKODIV2 CLKDIV2 SR [3:0] BOSR Description CLKOUT divider select Core clock divide select Clock setting condition Base oversampling rate Settings 0 = CLKOUT is core clock (default) 1 = CLKOUT is core clock divided by 2 0 = core clock is MCLK (default) 1= core clock is MCLK divided by 2 See Table 26 and Table 27 USB mode: 0 = support for 250 fS based clock (default) 1 = support for 272 fS based clock Normal mode: 0 = support for 256 fS based clock (default) 1 = support for 384 fS based clock 0 = normal mode enable (default) 1 = USB mode enable
USB
USB mode select
Rev. 0 | Page 22 of 28
SSM2604
Table 26. Sampling Rate Lookup Table, USB Disabled (Normal Mode)
MCLK (CLKDIV2 = 0) 12.288 MHz MCLK (CLKDIV2 = 1) 24.576 MHz ADC Sampling Rate (RECLRC) 8 kHz (MCLK/1536) 8 kHz (MCLK/1536) 12 kHz (MCLK/1024) 16 kHz (MCLK/768) 24 kHz (MCLK/512) 32 kHz (MCLK/384) 48 kHz (MCLK/256) 48 kHz (MCLK/256) 96 kHz (MCLK/128) 8.0182 kHz (MCLK/1408) 8.0182 kHz (MCLK/1408) 11.025 kHz (MCLK/1024) 22.05 kHz (MCLK/512) 44.1 kHz (MCLK/256) 44.1 kHz (MCLK/256) 88.2 kHz (MCLK/128) 8 kHz (MCLK/2304) 8 kHz (MCLK/2304) 12 kHz (MCLK/1536) 16 kHz (MCLK/1152) 24 kHz (MCLK/768) 32 kHz (MCLK/576) 48 kHz (MCLK/384) 48 kHz (MCLK/384) 96 kHz (MCLK/192) 8.0182 kHz (MCLK/2112) 8.0182 kHz (MCLK/2112) 11.025 kHz (MCLK/1536) 22.05 kHz (MCLK/768) 44.1 kHz (MCLK/384) 44.1 kHz (MCLK/384) 88.2 kHz (MCLK/192) DAC Sampling Rate (PBLRC) 8 kHz (MCLK/1536) 48 kHz (MCLK/256) 12 kHz (MCLK/1024) 16 kHz (MCLK/768) 24 kHz (MCLK/512) 32 kHz (MCLK/384) 8 kHz (MCLK/1536) 48 kHz (MCLK/256) 96 kHz (MCLK/128) 8.0182 kHz (MCLK/1408) 44.1 kHz (MCLK/256) 11.025 kHz (MCLK/1024) 22.05 kHz (MCLK/512) 8.0182 kHz (MCLK/1408) 44.1 kHz (MCLK/256) 88.2 kHz (MCLK/128) 8 kHz (MCLK/2304) 48 kHz (MCLK/384) 12 kHz (MCLK/1536) 16 kHz (MCLK/1152) 24 kHz (MCLK/768) 32 kHz (MCLK/576) 48 kHz (MCLK/384) 8 kHz (MCLK/2304) 96 kHz (MCLK/192) 8.0182 kHz (MCLK/2112) 44.1 kHz (MCLK/384) 11.025 kHz (MCLK/1536) 22.05 kHz (MCLK/768) 8.0182 kHz (MCLK/2112) 44.1 kHz (MCLK/384) 88.2 kHz (MCLK/192) USB 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SR [3:0] 0011 0010 0100 0101 1110 0110 0001 0000 0111 1011 1010 1100 1101 1001 1000 1111 0011 0010 0100 0101 1110 0110 0000 0001 0111 1011 1010 1100 1101 1001 1000 1111 BOSR 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 BCLK (MS = 1) 1 MCLK/4 MCLK/4 MCLK/4 MCLK/4 MCLK/4 MCLK/4 MCLK/4 MCLK/4 MCLK/2 MCLK/4 MCLK/4 MCLK/4 MCLK/4 MCLK/4 MCLK/4 MCLK/2 MCLK/6 MCLK/6 MCLK/6 MCLK/6 MCLK/6 MCLK/6 MCLK/6 MCLK/6 MCLK/3 MCLK/6 MCLK/6 MCLK/6 MCLK/6 MCLK/6 MCLK/6 MCLK/3
11.2896 MHz
22.5792 MHz
18.432 MHz
36.864 MHz
16.9344 MHz
33.8688 MHz
1
BCLK frequency is for master mode and slave right-justified mode only.
Rev. 0 | Page 23 of 28
SSM2604
Table 27. Sampling Rate Lookup Table, USB Enabled (USB Mode)
MCLK (CLKDIV2 = 0) 12.000 MHz MCLK (CLKDIV2 = 1) 24.000 MHz ADC Sampling Rate (RECLRC) 8 kHz (MCLK/1500) 8 kHz (MCLK/1500) 8.0214 kHz (MCLK/1496) 8.0214 kHz (MCLK/1496) 11.0259 kHz (MCLK/1088) 12 kHz (MCLK/1000) 16 kHz (MCLK/750) 22.0588 kHz (MCLK/544) 24 kHz (MCLK/500) 32 kHz (MCLK/375) 44.118 kHz (MCLK/272) 44.118 kHz (MCLK/272) 48 kHz (MCLK/250) 48 kHz (MCLK/250) 88.235 kHz (MCLK/136) 96 kHz (MCLK/125) DAC Sampling Rate (PBLRC) 8 kHz (MCLK/1500) 48 kHz (MCLK/250) 8.0214 kHz (MCLK/1496) 44.118 kHz (MCLK/272) 11.0259 kHz (MCLK/1088) 12 kHz (MCLK/1000) 16 kHz (MCLK/750) 22.0588 kHz (MCLK/544) 24 kHz (MCLK/500) 32 kHz (MCLK/375) 8.0214 kHz (MCLK/1496) 44.118 kHz (MCLK/272) 8 kHz (MCLK/1500) 48 kHz (MCLK/250) 88.235 kHz (MCLK/136) 96 kHz (MCLK/125) USB 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 SR [3:0] 0011 0010 1011 1010 1100 1000 1010 1101 1110 0110 1001 1000 0001 0000 1111 0111 BOSR 0 0 1 1 1 0 0 1 0 0 1 1 0 0 1 0 BCLK (MS = 1) 1 MCLK MCLK MCLK MCLK MCLK MCLK MCLK MCLK MCLK MCLK MCLK MCLK MCLK MCLK MCLK MCLK
1
BCLK frequency is for master mode and slave right-justified mode only.
Rev. 0 | Page 24 of 28
SSM2604
ACTIVE, ADDRESS 0x09
Table 28. Active Register Bit Map
D8 0 D7 0 D6 0 D5 0 D4 0 D3 0 D2 0 D1 0 D0 ACTIVE
Table 29. Descriptions of Active Register Bit
Bit Name ACTIVE Description Digital core activation control Settings 0 = disable digital core (default) 1 = activate digital core
SOFTWARE RESET, ADDRESS 0x0F
Table 30. Software Reset Register Bit Map
D8 D7 D6 D5 D4 RESET [8:0] D3 D2 D1 D0
Table 31. Descriptions of Software Reset Register Bits
Bit Name RESET [8:0] Description Write all 0s to this register to set all registers to their default settings. Other data written to this register has no effect. Settings 0 = reset (default)
Rev. 0 | Page 25 of 28
SSM2604 OUTLINE DIMENSIONS
4.00 BSC SQ 0.60 MAX
15 16 20 1
0.60 MAX
PIN 1 INDICATOR
2.65 2.50 SQ 2.35
5
PIN 1 INDICATOR
3.75 BSC SQ
0.50 BSC
EXPOSED PAD
(BOTTOM VIEW)
TOP VIEW 0.80 MAX 0.65 TYP
0.50 0.40 0.30
11
10
6
0.25 MIN
1.00 0.85 0.80 SEATING PLANE
12 MAX
COMPLIANT TO JEDEC STANDARDS MO-220-VGGD-1
Figure 28. 20-Lead Lead Frame Chip Scale Package [LFCSP_VQ] 4 mm x 4 mm Body, Very Thin Quad (CP-20-4) Dimensions shown in millimeters
ORDERING GUIDE
Model SSM2604CPZ-R2 1 SSM2604CPZ-REEL1 SSM2604CPZ-REEL71 SSM2604-EVALZ1
1
Temperature Range -40C to +85C -40C to +85C -40C to +85C
Package Description 20-Lead Lead Frame Chip Scale Package [LFCSP_VQ] 20-Lead Lead Frame Chip Scale Package [LFCSP_VQ] 20-Lead Lead Frame Chip Scale Package [LFCSP_VQ] Evaluation Board
071808-B
0.30 0.23 0.18
0.05 MAX 0.02 NOM COPLANARITY 0.08 0.20 REF
FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET.
Package Option CP-20-4 CP-20-4 CP-20-4
Z = RoHS Compliant Part.
Rev. 0 | Page 26 of 28
SSM2604 NOTES
Rev. 0 | Page 27 of 28
SSM2604 NOTES
(c)2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06978-0-7/08(0)
Rev. 0 | Page 28 of 28

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