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CXA1917AM/AS
Dolby S type Noise Reduction Processor
Description The CXA1917AM/AS is a bipolar IC designed for use in the Dolby S type noise reduction system (NR). An external operational amplifier is required to configure the decoder. The stereo Dolby B-C-S type NR combines use of a CXA1563M/S and two CXA1917AM/AS ICs. 30 pin SOP (Plastic) 30 pin SDIP (Plastic)
Features * Considerable reduction in the number of external parts (half compared to CXA1417S/Q) * The same Dolby level as that of CXA1560 series ICs (-6dBm) Structure Bipolar silicon monolithic IC Absolute Maximum Ratings (Ta = 25C) * Supply voltage VCC to VEE 17 * Operating temperature Topr -20 to +75 * Storage temperature Tstg -65 to +150 * Allowable power dissipation PD (CXA1917AM) 600 (CXA1917AS) 1200 Recommended Operating Conditions Supply voltage VCC VEE
V C C mW mW
4.5 to 6.5 -4.5 to -6.5
V V
This IC is available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications information may be obtained. "Dolby" and the double D symbols are trademarks of Dolby Laboratories Licensing Corporation.
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
-1-
E95Y15B74
Block Diagram and Pin Configuration (Encoder Unit)
C25 39n VCT R30 8.2k 2% C30 2.2n R31 13k 2% R34 1.5k 21 20 TCS1L TCS2L TCF2L TCF1L IREF 19 18 17 16 VCC C34 8.2n C40 47n C44 0.1 23 22 SCBOL FBOL C42 0.22 10% R45 47 C45 0.47 10% R47 33 R28 24k 2% C38 1 27 25 24 RECOUT SCINL HLSOUT ANTSAT SLDET 20k FLDET FLICG FLVCR SLVCR VCC 1 GND 2 VREF & IREF SHDET LFDET FHVCR SHVCR SHICG VEE 3 VCT 4 LFVCR LFICG V to I Conv H FHDET FHICG SLICG ZHSL 26 C29 470p R27 10k 2%
RECOUT
5
VCT
R9 39k 28 MCBO
R12 C8 10k 22n
C14 100n
30
29
MC4IN
MC3IN
20k
15k
17.5k
V to I Conv H
GND
MC4
6
MC3
R25 33
R14 16k 2%
C24 39n
C17 100n
R16 39k 2%
C20 22n
C23 0.22
R24 10k 2%
C26 1 10%
-2-
ZHSH 3 R19 39k 2% 4 7 5 6 R26 18k 2% 8 ZL2 LFIN TCL1 TCL2 SCINH 9 FBOH 10 TCF1H 11 C7 100n VCT C27 680p VCT C31 8.2n C41 0.1
MC1
MC4 MC3DS MC3DT MC MC2 MC1
HLSMP
MCTC
TCF2H 12 R46 33 C43 0.47 10%
TCS2H 13 R48 47 C46 0.22 10%
TCS1H 14
VCT 15
VEE
R10 27k 2%
R20 5.1k 2%
1
2
C19 1.8n
C21 1.8n
C16 0.22
C48 0.1 10% VCT
INPUT
CXA1917AM/AS
7
C11 100n
R15 VCT 2.4k 2%
VCT
Note) Split Supply: Short VCT to GND Single Supply: Short GND to VEE and open VCT Tolerances of resistors are 5% without otherwise specified Tolerances of film capacitors are 5% without otherwise specified Tolerances of chemical capacitors are 20% without otherwise specified
CXA1917AM/AS
Pin Description Pin No. Symbol DCV (V)
(DCV values are for Vcc = 6.0V and VEE = -6.0V.) Equivalent Circuit
VCC
Description
1
HLSMP
0
1
HLS main path input
VEE VCC
1.5k 2
2
MCTC
-3.9
9.2k
Time constant for the MC2
2p VEE VCC
2.6k 3
3
ZHSH
0
DC cut capacitance for the HLS/HF/SB detector
VEE VCC
VCT 16k
4
ZL2
0
4
HF/LF/FB pass band rectifier input
GND
-3-
CXA1917AM/AS
Pin No.
Symbol
DCV (V)
Equivalent Circuit
VCC
Description
5
10.2k
5
LFIN
0
HLS/LF/FB-stage input
GND VCC
1.5k
6
TCL1
-4.6
6 68k
Primary time constant for the HLS/LF/FB detector
VEE VCC
7
7
TCL2
-4.6
300k 124k
Secondary time constant for the HLS/LF/FB detector
VEE VCC
500
8
SCINH
0
8 500
HLS/HF side chain input
VEE
-4-
CXA1917AM/AS
Pin No.
Symbol
DCV (V)
Equivalent Circuit
VCC
Description
9
FBOH
0
1.6k 9 22 5.1k VCT
HLS/HF/FB VCR output
22
FBOL
0
GND VCC
LLS/HF/FB VCR output
10
10
TCF1H
0
80k
Primary time constant for the HLS/HF/FB detector
VEE VCC
11
TCF2H
-4.6
11 18 340k 22k
Secondary time constant for the HLS/HF/FB detector
18
TCF2L
-4.6
VEE VCC
Secondary time constant for the LLS/HF/FB detector
12
TCS2H
-4.6
2k 12 20 364k 46k 4k
Secondary time constant for the HLS/HF/SB detector
20
TCS2L
-4.6
VEE
Secondary time constant for the LLS/FB/SB detector
-5-
CXA1917AM/AS
Pin No.
Symbol
DCV (V)
Equivalent Circuit
VCC
Description
13
13
TCS1H
-4.6
80k 26k
Primary time constant for the HLS/HF/SB detector
VEE VCC
2k
500 500
14
VCT
0
14
For dual power supply: Ground For single power supply: VCT
GND
15
VEE
-6.0
For dual power supply: Negative power supply For single power supply: Ground Positive power supply
VCC
16
VCC
6.0
1.5k
17
IREF
-4.8
17
Reference current input
VEE VCC
1.5k
19
TCF1L
-4.6
19 80k
Primary time constant for the LLS/HF/FB detector
VEE
-6-
CXA1917AM/AS
Pin No.
Symbol
DCV (V)
Equivalent Circuit
VCC
Description
21
TCS1L
-4.6
21 86k 70k
Primary time constant for the LLS/HF/SB detector
VEE
VCC
23
SCBOL
0
500 24 500
1.64MEG 500p 23
LLS/HF side chain buffer amplifier output
24
SCINL
0
VEE
LLS/HF side chain input
VCC
25
RECOUT
0
17.5k 25 47p 20p 2k 200 500 200 500 20k 20k 28
Recording (encoding) output
28
MCBO
0
VEE
MC buffer feedback
VCC
3.6k 26
26
ZHSL
0
DC cut capacitance for the LLS/HF/SB detector
VEE
-7-
CXA1917AM/AS
Pin No.
Symbol
DCV (V)
Equivalent Circuit
VCC
Description
20k
500
11k 26
27
HLSOUT
0
27 47p 500
HLS output
VEE VCC
22k
22k
29
MC3IN
0
29
MC3 input
VEE VCC
30
MC4IN
0
30
MC4 input
VEE
-8-
CXA1917AM/AS
Electrical Characteristics Characteristics Operating voltage Current consumption
(Ta = 25C, Dolby level: -6dBm (= 388mVrms) at encoder input, Vcc = +6V, VEE = -6V) Measurement conditions Symbol VOPR ICC EB-1 EB-2 EB-3 EB-4 EB-5 EB-6 EB-7 EB-8 Vomax THD SNR 2 0.05 0.3 12 0.3 2 0.05 12 1 1 0 Rg = 600 CCIR/ARM -60 -40 -40 -40 -20 -20 0 0 THD = 1% f (kHz) 1 Input 15dB Other THD 1% No signal Min. 4.5 10.0 22.0 5.9 15.0 12.8 6.7 4.4 -2.9 -7.3 14.0 -- 62.0 15.0 23.5 7.4 16.5 14.3 8.2 5.9 -1.4 -5.8 16.0 0.01 65.0 Typ. Max. 6.5 20.0 25.0 8.9 18.0 15.8 9.7 7.4 0.1 -4.3 -- 0.15 -- Unit V mA dB dB dB dB dB dB dB dB dB % dB
Encoding characteristics (boost) (1) (2) (3) (4) (5) (6) (7) (8) Signal handling Total harmonic distortion S/N ratio
-9-
Electrical Characteristics Measurement Circuit
Signal Genarator Distortion Anaryzer C25 39n R27 10k CCIR/ARM R30 8.2k C30 2.2n Noise Meter
R12 10k
C14 100n
C29 470p
R9 39k C38 1 R31 13k R34 1.5k 23 22 20 21 19 18 C34 8.2n C40 47n C42 0.22 C44 0.1 24 27 25 26 28
C8 22n
VCC (+6V) C45 0.47 17 R28 24k 16
A
1
30
29
ZHSL
MCBO
SCINL
FBOL
MC4IN
MC3IN
SCBOL
TCS1L
TCS2L
TCF1L
TCF2L
IREF
VCC
HLSOUT
RECOUT
ZHSH
FBOH
MCTC
SCINH
HLSMP
TCL2
TCL1
LFIN
ZL2
TCF1H
TCF2H
TCS2H
1 3 4 7 8
2
5
6 9
10
11
12
13
TCS1H
14
VCT
15
C16 0.22
C7 100n
C23 0.22
R23 33 C26 1 C31 8.2n
C41 0.1
C43 0.47
C46 0.22
C48 0.1 VEE (-6V) 3
R10 27k R19 39k C17 100n R16 39k C20 22n C24 39n R24 10k
R14 16k
R20 5.1k
R26 18k C27 680p CXA1917AM/AS
C11 100n
R15 2.4k
C19 1.8n
C21 1.8n
VEE
- 10 -
GND 2
Application Circuit
LINEOUT 6 C4 4.7 C25 39n R12 10k R30 8.2k C30 2.2n C42 0.22 R45 47 20 19 C44 0.1 18 R47 33 17 C45 0.47 C9 4.7 R27 10k (-6dBm) RECOUT 5 (-6dBm)
INPUT C8 22n C38 1 27 25 24 22 21 26 23 R31 13k R34 1.5k C40 47n C34 8.2n 30 29 28
C14 100n
(-25dBm)
R5 12k
ZHSL
MCBO
SCINL
FBOL
MC4IN
MC3IN
SCBOL
TCS1L
TCS2L
TCF1L
TCF2L
IREF
VCC
R4 12k DECODE
C1 4.7
C29 470p
7
R9 39k
VCC (+6V) R28 24k 16 1
HLSOUT
RECOUT
GND 2
ZL2
ZHSH
FBOH
MCTC
SCINH
HLSMP
TCL2
LFIN
C3 33 1 2 3 7 4 8 5 6 9
TCF1H
TCF2H
C2 33
TCL1
TCS2H
10
11 R46 33 C41 0.1 C43 0.47
12 R48 47 C46 0.22
13
TCS1H
14
VCT
15
C16 0.22
C7 100n
C23 0.22
R25 33 C26 1 C31 8.2n
C48 0.1 VEE (-6V) 3
R10 27k C21 1.8n C17 100n R16 39k R19 39k C20 22n C24 39n
R14 16k
R20 5.1k
C11 100n
R15 2.4k
C19 1.8n
R24 10k
R26 18k C27 680p
CXA1917AM/AS
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
VEE
- 11 -
R2 1.5k
ENCODE R3 1.5k
R1 22k
CXA1917AM/AS
Notes on Application The CXA1917A is an encoding IC for the Dolby S type (NR). An external operational amplifier is required to configure the decoder circuit. The Dolby level voltage of this IC is designed to be -6dBm (388mVrms), which is the same as that of the CXA1562 and CXA1563 Dolby B-C type ICs. Therefore, it is possible to use the CXA1562 or the CXA1563 to configure a B-C-S type switchable processor. The B-C-S type switchable processor can be configured without requiring an external operational amplifier because the CXA1563 has a built-in S-type changeover switch. Power Supply The CXA1917A will operate with either dual or single power supply. Connect VCT pin to GND pin when dual power supply is used. Connect VEE pin to GND pin and open VCT pin when a single power supply is used. The power supply half the Vcc generated inside the IC is generated at VCT pin. The supply voltage range is from 4.5V to 6.5V and from 9V to 13V for dual and single power supplies, respectively. Note, however, that the minimum supply voltage is determined by the maximum voltage amplitude of external operational amplifier. Because general-purpose operational amplifiers have the maximum voltage amplitude of approximately (Vcc - VEE) -2V, actual minimum supply voltages, which satisfy the 15dB overload margin, are 5.0V and 10V for dual and single power supplies, respectively. The supply current does not depend so much on the supply voltage, but does depend on the signal level and frequency. The maximum supply current in the worst case is approximately 25mA. Recording Processor Fig. 1 shows the recording processor. The gain is defined as follows: GREC20 * Log (1 + R62/R63) ...... (1) The processor in Fig. 1 has a gain of 14dB, therefore, input sensitivity is -20dBm (77.5mVrms). An input sensitivity higher than -25dBm (44mVrms) is generally unacceptable due to noise performance, although this is affected by the operational amplifier in the input circuit. An important characteristic for the external operational amplifier is the noise performance for approximately an input impedance of 20k. A bipolar input type will be better than the JFET input type for the recording processor. Playback Processor Fig. 2 shows the playback processor. The gain is defined as follows: GPB20 * Log (1 + R64/R65) ...... (2) The processor in Fig. 2 has a gain of 20dB, therefore, the input sensitivity is -26dBm (39mVrms). Important characteristics of the playback processor are the frequency response and the feedback loop stability, which depend on the gain of the feedback loop gain and the slew rate of the external operational amplifier. The slew rate has to be higher than 3V/s. The loop gain can be estimated using the gain bandwidth product BG (Hz) of the operational amplifier and the decode gain APB. The lower limit of BG/APB is approximately 500kHz, and the recommended range is from 1 to 3MHz. Switchable Processor Fig. 3 shows the switchable processor. The gains are the same as in equations (1) and (2). An operational amplifier is required with low noise, average slew rate (> 3V/s), and wide bandwidth ( 10MHz) for this gain setting. A bipolar input type operational amplifier with a wide bandwidth like those of the 4560 and the 4570 is required of the switchable processor. The processor in Fig. 3 may generate a significant switching noise, especially when S2 switch is make-breakmake type. When S2 switch is a make-to-make type or has a quick switching feature, the switching noise will be within the range acceptable for cassette decks with output muting circuits.
- 12 -
CXA1917AM/AS
B-C-S Type Switchable Stereo Processor Fig. 4 shows the stereo processor switchable to any B-C-S type mode. The operational amplifier is unnecessary, because the CXA1563 is used for a B-C type processor and S-type changeover switch is built in the IC. It is recommended that the S type mode be used for recording level calibration.
C61 4.7 C62 4.7 C63 2.2 A1 R61 56k R63 3k VCT R62 12k Encoder Unit GND VCC 1 5 RECOUT 6 GND 7 INPUT GND 2 VEE 3 VCT 4 4 VCT 2 3 GND VEE 1 VCC
RECOUT (-6dBm) 5 LINEOUT (-6dBm) 6 RECIN (-20dBm) 7
Fig. 1. Recording Processor
LINEOUT (-6dBm) 6 C64 2.2 R61 22k
C62 4.7 1 VCC R64 18k A1 R65 2k GND VCC 1 5 RECOUT 6 GND 7 INPUT GND 2 VEE 3 VCT 4 4 VCT Encoder Unit 2 3 GND VEE
PBIN (-26dBm) 8
VCT
Fig. 2. Playback Processor
RECOUT (-6dBm) LINEOUT (-6dBm) PBIN (-26dBm) RECIN (-20dBm)
C61 10 5 C62 10 6 8 7 S1 R61 56k R65 2k R63 3k C63 2.2 R64 18k A1 S2 GND 5 RECOUT 6 GND 7 INPUT VCC 1 GND 2 VEE 3 VCT 4 4 VCT R62 12k Encoder Unit 2 3 GND VEE 1 VCC
VCT
Fig. 3. Switchable Processor
- 13 -
CXA1917AM/AS
LINE OUT1 13
REC OUT1 14
C13 1 Encoder Unit 1 5 RECOUT GND 6 GND 7 INPUT C12 1 27 26 22 21
C16 1
VCC 1 GND 2 VEE 3 VCT 4 MPX OFF PB 18 16 MPX ON 15 1 VCC GND
PBIN1 12
LINEIN1 11
VCT C11 1 28
PBIN1
SIN1
MODE
VCT
LINEOUT1
RECOUT1
LINEIN1
VCC
CXA1563
2 GND
GND
LINEOUT2
RECOUT2
LINEIN2
PBIN2
NRSW
SSW
SIN2
2 C21 1 LINEIN2 21 C22 1
3
7
8
11 S Encoder Unit 2 VCC 1 GND
12 B/C OFF
13 C
14
B
GND
3
VEE
5 RECOUT GND 2 PBIN2 22 GND 6 GND 7 INPUT C23 1 VEE 3 VCT 4
4 C26 1
VCT
23 LINEOUT2
24 RECOUT2
Fig. 4. B-C-S Switchable Stereo Processor
- 14 -
CXA1917AM/AS
Example of Representative Characteristics
Current consumption vs. Supply voltage
18 No signal 18
Current consumption vs. Input level
VCC = +6V VEE = -6V 0dB = -6dBm 10kHz 16 1kHz 100Hz 14
ICC - Current consumption [mA]
16
14
12
ICC - Current consumption [mA]
8 10 12 14 16
12
-10
0 Encoding input level [dB]
10
VCC - VEE - Supply voltage [mA]
Encoding characteristics
25 20 VCC = +6V VEE = -6V 0dB = -6dBm -60dB -50dB -40dB -30dB 10 -20dB 5 -10dB 0 -5 -10 0dB +10dB
Total harmonic distortion characteristics
VCC = +6V VEE = -6V 0dB = -6dBm
15
Total harmonic distortion [%]
1.0
Encoding boost [dB]
100Hz 0.1
1kHz
10kHz
30
100
300
1k
3k
10k
30k
0.01
-10
-5
0
5
10
15
20
Frequency [Hz]
Output level [dB]
Overload margin vs. Supply voltage
-10 VCC = +6V VEE = -6V 0dB = -6dBm f = 1kHz
Ripple rejection
VCC - VEE = 12V Vripple = -20dBm Encode Mode VCC (Dual Supply) VCC (Single Supply) C = 47 (14pin)
20
Overload margin [dB]
Ripple rejection [dB]
Overload margin: Encoding input level when 1% of total harmonic distortion is generated at the encoding output 8 10 12 14 16
-20
15
-30
10
VEE (Dual Supply)
-40
30
100
300
1k
3k
10k
30k
VCC - VEE - Supply voltage [V]
Frequency [Hz]
- 15 -
CXA1917AM/AS
Package Outline CXA1917AM
Unit: mm
30PIN SOP(PLASTIC)
+ 0.4 2.3 - 0.15 0.1 16
+ 0.4 18.8 - 0.1 30
10.3 0.4
+ 0.3 7.6 - 0.1
+ 0.2 0.1 - 0.05
(9.3)
15 1 0.45 0.1 1.27 0.2 M + 0.1 0.2 - 0.05
0 to 10
DETAIL A
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SOP-30P-L03 SOP030-P-0375 LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY RESIN SOLDER PLATING 42/COPPER ALLOY 0.7g
CXA1917AS
30PIN SDIP (PLASTIC)
+ 0.1 05 0.25 - 0.
+ 0.4 26.9 - 0.1
30
16
+ 0.3 8.5 - 0.1
10.16
0.5 0.2
0 to 15
A
1 1.778
15
0.5 0.1 0.9 0.15
PACKAGE STRUCTURE
MOLDING COMPOUND SONY CODE EIAJ CODE JEDEC CODE SDIP-30P-01 SDIP030-P-0400 LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY / PHENOL RESIN SOLDER/PALLADIUM PLATING COPPER ALLOY 1.8g
- 16 -
3.0 MIN
0.5 MIN
+ 0.4 3.7 - 0.1

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