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HT82V42 CIS Analog Signal Processor
Features
* 3.3V single power supply * Low power consumption: 188mW (Typ.) * Power-down mode: 300uA (Typ.) * 16-bit 15 MSPS A/D converter * Guaranteed wont miss codes * 8-bit programmable gain * Correlated Double Sampling * 315mV 8-bit programmable offset * Programmable clamp voltage * Internal voltage reference * Programmable 4-wire serial interface * 4-bit multiplexed nibble mode * 20-pin SSOP/TSSOP package
Applications
* Flatbed document scanners * Film scanners * Digital color copiers * Multifunction peripherals
General Description
The HT82V42 is a complete analog signal processor for CCD imaging applications. It features a 1-channel architecture designed to sample and condition the outputs of tri-linear color CCD arrays. The channel consists of an input clamp, Correlated Double Sampler (CDS), offset DAC and Programmable Gain Amplifier (PGA) and a high performance 16-bit A/D converter. The CDS amplifiers may be disabled for use with sensors such as Contact Image Sensors (CIS) and CMOS active pixel sensors, which do not require CDS. The 16-bit digital output is available in 4-bit wide multiplexed format. The internal registers are programmed through a 4-wire serial interface, which provides gain, offset and operating mode adjustments. The HT82V42 operates from a single 3.3V power supply and typically consumes 188mW of power.
Block Diagram
AVDD AVSS VRB VRT VRX AVSS DVDD1 DVDD2 DGND
RPGA GPGA BPGA 3:1 MUX BANDGAP Reference
VIN
CDS
+
PGA
RDAC GDAC BDAC 3:1 MUX
10-Bit DAC
16-Bit ADC
16
16 : 4 MUX
4
OD[0] OD[1] OD[2] OD[3]/SDO
Configuration Register
MUX Register RED GREEN BLUE RED GREEN BLUE VRLC/ BAIS Clamp DAC Digital Control Interface SCLK SEN SDI
Gain Registers
Offset Registers
CDSCLK2
DCLK
ACYC
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Pin Assignment
AGND 1 2 3 4 5 6 7 8 9 10 DVDD1 CDSCLK2 DCLK DGND SEN DVDD2 SDI SCK OD0 20 19 18 17 16 15 14 13 12 11 H T82V42 2 0 S S O P -A V IN V R L C /V B IA S VRX VRT VRB AGND AVDD O D 3 /S D O OD2 OD1 AGND 1 2 3 4 5 6 7 8 9 10 V IN CDSCLK2 ACYC DCLK DGND SEN DVDD2 SDI SCK 20 19 18 17 16 15 14 13 12 11 V R L C /V B IA S VRX VRT VRB AGND AVDD O D 3 /S D O OD2 OD1 OD0
H T82V42 2 0 T S S O P -A
Pin Description
Pin Name AGND DVDD1 CDSCLK2 RLC/ACYC DCLK DGND SEN DVDD2 SDI SCK I/O P P DI DI DI P DI P DI DI Description Negative power supply for analog circuit Digital Driver Power (3.3V). CDS Video Sample Clock Pulse Input ACYC auto cycles between R, G, B inputs. ADC Clock. This clock is applied at N times the input pixel rate (N = 2, 3, 6, 8 or any multiple of 2 thereafter depending on input sample mode). Digital Driver Ground Serial Interface Enable Pulse (High Active) Digital Driver Power(3.3V). Serial Data Input Clock Input for Serial Interface Digital multiplexed output data bus. ADC output data D[15:0] is available in two multiplexed formats as shown. A D12 OD0~OD2 OD3/SDO DO D13 D14 D15 B D8 D9 D10 D11 C D4 D5 D6 D7 D D0 D1 D2 D3
When register bit OEB = 0, address bit4 = 1 and SEN has been pulsed high, this pin use as SDO for register data read-back. Otherwise, this pin use as Digital Data Output. AVDD VRB VRT VRX VRLC/VBIAS VIN Note: P Analog Supply (3.3V).
AO Reference Decoupling, this pin must be connected to AGND via a decoupling capacitor. AO Reference Decoupling, this pin must be connected to AGND via a decoupling capacitor. AO Reference Decoupling, this pin must be connected to AGND via a decoupling capacitor. Selectable analog output voltage for RLC or single-ended bias reference. This pin would AO typically be connected to AGND via a decoupling capacitor. VRLC can be externally driven if programmed Hi-z. AI Analog Input
AI=Analog Input; AO=Analog Output; AIO=Analog Inout DI=Digital Input; DO=Digital Output; P=Power
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Absolute Maximum Ratings
Supply Voltage ..........................VSS-0.3V to VSS+4.3V Input Voltage .............................VSS-0.3V to VCC+0.3V Analogue Supply Power ...............................3.0V~3.6V Storage Temperature ...........................-50C to 125C Operating Temperature ..............................0C to 70C Digital supply power......................................3.0V~3.6V
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
D.C. Characteristics
AVDD=DVDD1=DVDD2=3.3V, AGND=DGND=0V, Ta=25C, DCLK=30MHz unless otherwise stated. Symbol Parameter Test Conditions VDD Conditions Min. Typ. Max. Unit
Overall System Specification (including 16-bit ADC, PGA, Offset and CDS Functions) Full-scale Input Voltage Range 3.3V (see Note 1) VIN Input Signal Limits (see Note 2) 3.3V Full-scale Transition Error Zero-scale Transition Error DNL INL Differential non-Linearity Integral non-Linearity Total Output Noise References VRT VRB VRX VRTB Upper Reference Voltage Lower Reference Voltage Input Return Bias Voltage Diff. Reference Voltage (VRT-VRB) 3/4 3/4 3/4 3/4 1.90 0.90 3/4 0.9 2.00 1.00 1.70 1.0 2.20 1.20 3/4 1.1 V V V V 3.3V 3.3V 3.3V 3.3V 3.3V Max Gain 3/4 3/4 Gain = 0dB; PGA[7:0] = 54(hex) Gain = 0dB; PGA[7:0] = 54(hex) 3/4 3/4 Min Gain 3/4 3/4 0 3/4 3/4 3/4 3/4 3/4 3/4 50 50 1.5 50 7 18 0.27 3.0 3/4 3/4 AVDD 3/4 3/4 3/4 3/4 3/4 3/4 VP-P VP-P V mV mV LSB LSB LSB rms
Reset-Level Clamp (RLC) circuit/ Reference Level DAC Reference RLCDAC Resolution VRLCSTEP VRLCBOT Reference RLCDAC Step Size RLCDACRNG=0 Reference RLCDAC Step Size RLCDACRNG=1 Reference RLCDAC Output Voltage at Code 0(hex), RLCDACRNG=0 Reference RLCDAC Output Voltage at Code 0(hex), RLCDACRNG=1 3.3V 3.3V 3/4 3/4 3/4 3/4 3/4 0.159 0.096 4 0.173 0.11 3/4 0.187 0.124 bits V/step V/step
VRLCBOT
0.35
0.4
0.45
V
VRLCTOP
3/4
0.35
0.40
0.45
V
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Symbol Parameter Reference RLCLDAC Output Voltage at Code F(hex), RLCDACRNG=0 Test Conditions VDD 3.3V Conditions Min. Typ. Max. Unit
VRLCTOP
2.8
3.0
3.10
V
Reference RLCDAC Output VRLCSTEP Voltage at Code F(hex), RLCDACRNG=1 Offset DAC, Monotonicity Guaranteed Resolution DNL INL Differential Non-Linearity Integral Non-Linearity Step Size Output Voltage Programmable Gain Amplifier Resolution Gain Equation GMAX GMIN Max Gain Min Gain Gain Error Analogue to Digital Converter Resolution Speed Full-scale Input Range (2*(VRT-VRB)) Digital Inputs VIH VIL IIH IIL CI High Level Input Voltage Low Level Input Voltage High Level Input Current Low Level Input Current Input Capacitance
1.90
2.00
2.10
V
3/4 3/4 3/4 3/4 3/4 3/4
8 0.1 0.25 2.46 -315 +315
3/4 0.5 1.00 3/4 3/4 3/4
bits LSB LSB mV/step mV mV
3/4
8
3/4
bits V/V V/V V/V %
186/(278-PGA[7:0]) 6.50 0.65 3/4 8.00 0.68 2 8.40 0.75 3/4
3/4 3/4 3/4
16 3/4 2
3/4 15 3/4
bits MSPS V
0.7VDD 3/4 3/4 3/4 3/4
3/4 3/4 3/4 3/4 5
3/4 0.2VDD 1 1 3/4
V V mA mA pF
Digital Outputs VOH VOL IOZ High Level Output Voltage Low Level Output Voltage High Impedance Output Current IOH=1mA IOL=1mA DVDD-0.5 3/4 3/4 3/4 3/4 3/4 3/4 0.5 1 V V mA
Supply Currents Total Supply Current - Active (Signal Channel Mode) Total Analog Supply Current Active (Signal Channel Mode) Digital Supply Current - Active (DVDD1) LINEBYLINE=1 DCLK=30MHz LINEBYLINE=1 DCLK=30MHz DCLK=30MHz 3/4 3/4 3/4 57 36 14 3/4 3/4 3/4 mA mA mA
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Symbol Parameter Digital Supply Current - Active (DVDD2) Supply Current - Full Power Down Mode Note: Test Conditions VDD Conditions DCLK=30MHz Min. 3/4 3/4 Typ. Max. 3/4 3/4 Unit
7 300
mA mA
1. Full-scale input voltage denotes the peak input signal amplitude that can be gained to match the ADC full-scale input range. 2. Input signal limits are the limits within which the full-scale input voltage signal must lie.
A.C. Characteristics
AVDD=DVDD1=DVDD2=3.3V, AGND=DGND=0V, Ta=25C, DCLK=30MHz unless otherwise stated. Symbol Parameter Conversion Rate Input Video Timing Test Conditions VDD 3.3V Conditions 3/4 Min. 3/4 Typ. 3/4 Max. 15 Unit MSPS
AVDD=DVDD1=DVDD2=3.3V, AGND=DGND=0V, Ta=25C, DCLK=30MHz unless otherwise stated. Symbol tPER tDCLKH tDCLKL tVSMPSU tVSMPH tVSU tVH tRSU tRH Parameter DCLK period DCLK high period DCLK low period CDSCLK2 setup time CDSCLK2 hold time Video level setup time Video level hold time Reset level setup time Reset level setup time Min. 33.3 16.6 16.6 6 3 10 3 10 3 Typ. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Max. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Unit ns ns ns ns ns ns ns ns ns
Note : 1. tVSU and tRSU denote the setup time require after the input video signal has settled. 2. Parameters are measured at 50% of the rising/falling edge.
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Output Data Timing
Output Data Timing AVDD=DVDD1=DVDD2=3.3V, AGND=DGND=0V, Ta=25C, DCLK=30MHz unless otherwise stated. Symbol tPD Parameter Output propagation delay Min. 3/4 Typ. 3/4 Max. 16 Unit ns
Auto Cycle Timing AVDD=DVDD1=DVDD2=3.3V, AGND=DGND=0V, Ta=25C, DCLK=30MHz unless otherwise stated. Symbol tCYCSU tACYCH Parameter Auto cycle setup time Auto cycle hold time Min. 6 3 Typ. 3/4 3/4 Max. 3/4 3/4 Unit ns ns
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Serial Interface
Serial Interface Timing AVDD=DVDD1=DVDD2=3.3V, AGND=DGND=0V, Ta=25C, DCLK=30MHz unless otherwise stated. Symbol tSPER tSCKH tSCKLz tSSU tSH tSCE tSEC tSEW tSERD tSCRD tSCRDZ SCK period SCK high SCK low SDI setup time SDI hold time SCK to SEN setup time SEN to SCK setup time SEN pulse width SEN low to SDO = Register data SCK low to SDO = Register data SCK low to SDO = ADC data Parameter Min. 37.6 18.8 18.8 6 6 12 12 25 3/4 3/4 3/4 Typ. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Max. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 30 30 30 Unit ns ns ns ns ns ns ns ns ns ns ns
Note: Parameters are measured at 50% of the rising/falling edge.
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System Architecture
Introduction A device block diagram showing the signal paths present is provided. The HT82V42 samples a single channel input VIN. The device then processes the sampled video signal with respect to the video reset level or an internally/externally generated reference level for signal processing. The processing channel consists of an Input Sampling block with optional Reset Level Clamping (RLC) and Correlated Double Sampling (CDS), an 8-bit programmable offset DAC and an 8-bit Programmable Gain Amplifier (PGA). The ADC then converts this analogue signal to a 16-bit digital word. The digital output from the ADC is presented on a 4-bit wide bus. On-chip control registers determine the configuration of the device, including the offsets and gains applied to R/G/B signal. These registers are programmable via a serial interface. Input Sampling The HT82V42 can sample and process the input analogue signals as follows:
* Monochrome * Colour Line-by-Line
A single chosen input (Red, Green and Blue) is sampled and multiplexed into the analogue channel for processing before being converted by the ADC. The input selected can be switched in turn (Red (R) Green (R) Blue (R) Red 1/4) together with the PGA and Offset DAC control registers by pulsing the RLC/ACYC pin. This is known as auto-cycling. Alternatively, other sampling sequences can be generated via the control registers. Refer to the Line-by-Line Operation section for more details. Clamp Voltage The device contains an integrated single 4-bit DAC which is controlled by register setting for the clamp voltage. The internal clamp is sampled on the positive edge of DCLK that occurs during each CDSCLK2 pulse. The sampled level, high (or low) controls the presence (or absence) of the internal CL pulse on the next reset level. The position of CL can be adjusted by using control bits CDSREF[1:0].
A single chosen input VIN is sampled, processed by the corresponding channel, and converted by the ADC. The choice of input can be changed via the control interface, e.g. on a line-by-line basis if required.
Reset Sample and Clamp Timing
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CDS/CIS Processing For CCD type input signals, the time at which the reset level is sampled, is adjustable by setting control bits CDSREF[1:0] as shown in the previous figure. For CIS type input signals, non-CDS processing is used. During this case, the video level is processed with the voltage level on VRLC/VBIAS, the pin VRLC/VBIAS is generated internally or externally. The VRLC/VBIAS is sampled by Rs at the same time as Vs samples the video level in this mode. PGA Gain Registers There are three PGA registers which are used to individually program the gain. Bits D7 through D0 control the gain range in 256 increments. See the figure for a graph of the PGA gain versus PGA register code. The coding for the PGA registers is a straight binary number, with all zero words corresponding to the minimum gain setting (0.68x) and all one words corresponding to the maximum gain setting (8x). The PGA has a gain range from 0.68x (-3.3dB) to 8x (18dB), adjustable in 256 steps. The Figure shows the PGA gain as a function of the PGA register code. Although the gain curve is approximately linear in dB, the gain in V/V varies in nonlinear proportion with the register code, according to the following the equation: Gain (V/V) = 186 / (278-PGA[7:0]) Gain (dB) = 20LOG10 (186/(278-PGA[7:0]))
PGA Gain Register Settings
D7 MSB 0 0 1 1 1
D6
D5
D4
D3
D2
D1
D0 Gain(V/V) Gain (dB) LSB
0 1 1 1 1
0 0 0 1 1
0 1 0 0 1
0 0 0 0 1
0 1 0 0 1
0 0 0 0 1
0 0 0 0 1
0.68 1 2.23 3.50 8
-3.3 0* 7 10.8 18
Note: * Power-on default value
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Offset Registers There are three offset registers used to individually program the offset. Bits D7 through D0 control the offset range from -315mV to 315mV in 256 increments. The Table shows the offset range as a function of the bits D7 through D0. D7 MSB 0 0 0 0 : : 1 0 0 0 : : 1 1 1 1 1 1 1 1 0 0 0 0* 0 0 0 D6 D5 D4 D3 D2 D1 D0 LSB 0 Offset (mV) -315 : : 0 : : +315
Note :*Power-on default value Offset Register Settings
ADC Input Black Level Adjust The output from the PGA should be offset to match the full-scale range of the ADC (VFS=2.0V). For negative-going input video signals, a black level (zero differential) output from the PGA should be offset to the top of the ADC range by setting register bits PGAFS[1:0]=10. For positive going input signal the black level should be offset to the bottom of the ADC range by setting PGAFS[1:0]=11. Bipolar input video is accommodated by setting PGAFS[1:0]=00 or PGAFS[1:0]=01 (zero differential input voltage gives mid-range ADC output). Overall Signal Flow Summary The input sampling block produces an effective input voltage V1. For CDS, this is the difference between the input video level VIN and the input reset level VRESET. For non-CDS this is the difference between the input video level VIN and the voltage on the VRLC/VBIAS pin, VVRLC, optionally set via the RLC DAC.
The offset DAC block then adds the amount of fine offset adjustment required to move the black level of the input signal towards 0V, producing V2. The PGA block then amplifies the white level of the input signal to maximise the ADC range, outputting voltage V3. The ADC block then converts the analogue signal, V3, to a 16-bit unsigned digital output, D1. The digital output is then inverted, if required, through the output invert block to produce D2. Calculating Output for any Given Input The following equations describe the processing of the video and reset level signals through the HT82V42. The values of V1, V2 and V3 are often calculated in reverse order during device setup. The PGA value is written first to set the input Voltage range, the Offset DAC is then adjusted to compensate for any Black/Reset level offsets and finally the RLC DAC value is set to position the reset level correctly during operation.
Overall Signal Flow
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Input Sampling Block: Input Sampling and Referencing If CDS = 1, (i.e. CDS operation) the previously sampled reset level, VRESET, is subtracted from the input video. V1 = VIN - VRESET...................................................................Eqn. 1 If CDS = 0, (non-CDS operation) the simultaneously sampled voltage on pin VRLC is subtracted instead. V1 = VIN - VVRLC .....................................................................Eqn. 2 If VRLCEXT = 1, VVRLC is an externally applied voltage on pin VRLC/VBIAS. If VRLCEXT = 0, VVRLC is the output from the internal RLC DAC. VVRLC = (VRLCSTEP RLCV[3:0]) + VRLCBOT....................Eqn. 3 VRLCSTEP is the step size of the RLC DAC and VRLCBOT is the minimum output of the RLC DAC. OFFSET DAC Block: OFFSET (BLACK - LEVEL) Adjust The resultant signal V1 is added to the Offset DAC output. V2 = V1 + { 315mV (DAC[7:0] - 127.5) } / 127.5.....................Eqn. 4 PGA NODE: GAIN Adjust The signal is then multiplied by the PGA gain, V3 = V2 [186 / (278 - PGA[7:0] ) ]...........................................Eqn. 5
ADC Block: Analogue-Digital Conversion The analogue signal is then converted to a 16-bit unsigned number, with input range configured by PGAFS[1:0]. D1[15:0] = INT{ (V3 /VFS) 65535} + 32767 D1[15:0] = INT{ (V3 /VFS) 65535} D1[15:0] = INT{ (V3 /VFS) 65535} + 65535 where the ADC full-scale range, VFS = 2.0V if D1[15:0] < 0 if D1[15:0] > 65535 D1[15:0] = 0 D1[15:0] = 65535 PGAFS[1:0] = 00 or 01 .................Eqn. 6 PGAFS[1:0] = 11 ..........................Eqn. 7 PGAFS[1:0] = 10 ..........................Eqn. 8
Output Invert Block: Polarity Adjust The polarity of the digital output may be inverted by control bit INVOP. D2[15:0] = D1[15:0] D2[15:0] = 65535 - D1[15:0] (INVOP = 0).....................................................Eqn. 9 (INVOP = 1)...................................................Eqn. 10
Output Formats Latency of valid output data with respect to CDSCLK2 is programmable by writing to control bits DEL[1:0]. The latency for each mode is shown in the Operating Mode Timing Diagrams section. Figure shows the output data formats for Modes 1, 3 and 4. Figure shows the output data formats for Mode 2. Table summarizes the output data obtained for each format.
M CLK
M CLK
4 + 4 + 4 + 4 - B it O u tp u t A
B
A
B
C
D
Output Data Formats (Mode 2)
Output Format 4+4+4+4-Bit (Nibble)
4 + 4 + 4 + 4 - B it O u tp u t A B C D
Output Pins
Output A= d15~d12 B= d11~d8 C= d7~d4 D= d3~d0
OD3~OD0
Output Data Formats (Mode 1, 3, 4)
Details of Output Data
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Serial Interface Register Write
Control Interface The internal control registers are programmed via the serial digital control interface. The register contents can be read back via the serial interface on pin OD3/SDO. It is recommended that a software reset is carried out after the power-up sequence, before writing to any other register. This ensures that all registers are set to their default values Serial Interface - Register Write Figure shows the register writing in serial mode. Three pins, SCK, SDI and SEN are used. A six-bit address (a5, a4, a3, a2, a1, a0) is clocked in through SDI, MSB first, followed by an eight-bit data word (b7, b6, b5, b4, b3, b2, b1, b0), also MSB first. Each bit is latched on the rising edge of SCK. When the data has been shifted into the device, a pulse is applied to SEN to transfer the data to the appropriate internal register. Note all valid registers have address bit a4 equal to 0 in the write mode. A software reset is carried out by writing to Address 000100 with any value of data, i.e. Data Word = XXXXXXXX. Serial Interface - Register Read-back Figure shows register read-back in serial mode. Read-back is initiated by writing to the serial bus as described above but with address bit a4 set to 1, followed by an 8-bit dummy data word. Writing address (a5, 1, a3, a2, a1, a0) will cause the contents (d7, d6, d5, d4, d3, d2, d1, d0) of the corresponding register (a5, 0, a3, a2, a1, a0) to be output MSB first on pin SDO (on the falling edge of SCK). Note that pin SDO is shared with an output pin, OD3, therefore OEB should always be held low when register read-back data is expected on this pin. The next word may be read in to SDI while the previous word is still being output on SDO.
Timing Requirement To use this device a master clock (DCLK) of up to 30MHz and a per-pixel synchronisation clock (CDSCLK2) of up to 15MHz are required. These clocks drive a timing control block, which produces internal signals to control the sampling of the video signal. The DCLK to CDSCLK2 ratios and maximum sample rates for the various modes are shown in Table. Programmable CDSCLK2 Detect Circuit The CDSCLK2 input is used to determine the sampling point and frequency of the HT82V42. Under normal operation a pulse of 1 DCLK period should be applied to CDSCLK2 at the desired sampling frequency (as shown in the Operating Mode Timing Diagrams) and the input sample will be taken on the first rising DCLK edge after CSDCLK2 has gone low. However, in certain applications such a signal may not be readily available. The programmable CDSCLK2 detect circuit in the HT82V42 allows the sampling point to be derived from any signal of the correct frequency, such as a CCD shift register clock, when applied to the CDSCLK2 pin. When enabled, by setting the VSMPDET control bit, the circuit detects either a rising or falling edge (determined by the POSNNEG control bit) on the CDSCLK2 input pin and generates an internal VSMP pulse. This pulse can optionally be delayed by a number of DCLK periods, specified by the VDEL[2:0] bits. Figure shows the internal VSMP pulses that can be generated by this circuit for a typical clock input signal. The internal VSMP pulse is then applied to the timing control block in place of the normal CDSCLK2 pulse provided from the input pin. The sampling point then occurs on the first rising DCLK edge after this internal VSMP pulse, as shown in the Operating Mode Timing Diagrams.
Serial Interface Register Read-back
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Internal VSMP Pulse Generated by Programmable Internal Sample Detect Circuit
References The ADC reference voltages are derived from an internal bandgap reference, and buffered to pins VRT and VRB, where they must be decoupled to ground. Pin VRX is driven by a similar buffer, and also requires decoupling. The output buffer from the RLCDAC also requires decoupling at pin VRLC/VBIAS. Power Supply The HT82V42 can run from a single 3.3V single supply. Power Management Power management for the device is performed via the Control Interface. The device can be powered on or off completely by clearing the EN bit low. All the internal registers maintain their previously programmed value in the power down mode while the Serial Interface inputs remain active.
Line-by-Line Operation Certain linear sensors (e.g. Contact Image Sensors) give a colour output on a line-by-line basis. i.e. a full line of red pixels followed by a line of green pixels followed by a line of blue pixels. In this mode the input multiplexer and (optionally) the PGA/Offset register multiplexers can be auto-cycled by the application of pulses to the RLC/ACYC input pin by setting the ACYCNRLC register bit. See Figure for detailed timing information. The multiplexers change on the first DCLK rising edge after RLC/ACYC is taken high. A write to the auto-cycle reset register causes these multiplexers to be reset, selecting the colour R and the RED offset/gain registers. Alternatively, all three multiplexers can be controlled via the serial interface by writing to register bits INTM[1:0] to select the desired colour. It is also possible for the input multiplexer to be controlled separately from the PGA and Offset multiplexers. Table describes all the multiplexer selection modes that are possible.
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ACYCNRLC 0 1 Name Internal no force mux Auto-cycling, no force mux Description Input mux, offset and gain registers determined by internal register bits INTM1, INTM0. Input mux, offset and gain registers auto-cycled, RINP (R) GINP (R) BINP (R) RINP 1/4 on RLC/ACYC pulse.
Colour Selection Description in Line-by-Line Mode Operating Modes
Mode Description CDS Max. Sample Rate 5 MSPS Sensor Interface Description Timing Requirement Register Contents With CDS Register Contents Without CDS
1
Monochrome/Colour Line-by-Line
Only one input channel DCLK = 30MHz at a time is continuously sampled. DCLK: CDSCLK2 ratio is 6:1 DCLK = 30MHz Identical to mode 1 DCLK: CDSCLK2 ratio is 3:1 DCLK = 30MHz Identical to mode 1 DCLK: CDSCLK2 ratio is 2:1 DCLK = 30MHz Identical to mode 1 DCLK: CDSCLK2 ratio is 2n:1, n>=4 Identical to mode 1 CDS not possible Identical to mode 1 plus SetReg3: bits 5:4 must be set to 0 (h) SetReg1 : 3F(h)
Yes
SetReg1: 2D(h)
2
Fast Monochrome/ Colour Line-by-Line Maximum speed
Yes
10 MSPS
Identical to mode 1
3
Monochrome/Colour Line-by-Line Slow Monochrome/ Colour Line-by-Line
No
15 MSPS
SetReg1: 6D(h)
4
Yes
3.75 MSPS
Identical to mode 1
HT82V42 Operating Modes Operating Mode Timing Diagrams The following diagrams show 4-bit multiplexed output data and DCLK, CDSCLK2 and input video requirements for most common operations as shown in Table.
Mode 1 Operation
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Mode 2 Operation
Mode 3 Operation
Mode 4 Operation
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Device Configuration
* Register Map
The following table describes the location of each control bit used to determine the device operation. The register map is programmed by writing the required codes to the appropriate address via the serial interface.
Address Description DEF R/W (h) 0F 23 1F 00 00 05 41 00 00 01 01 01 80 80 80 80 00 00 00 00 R/W R/W R/W 3/4 3/4 R/W R R/W R/W R R R R/W R/W R/W R/W R/W R/W R/W W Bit 7 0 DEL[1] 0 3/4 3/4 0 3/4 0 ClkMotr 0 0 0 RO[7] GO[7] BO[7] RGBO[7] RPGA[7] GPGA[7] BPGA[7] 6 Mode3 DEL[0] 0 3/4 3/4 0 3/4 0 0 0 0 0 RO[6] GO[6] BO[6] RGBO[6] RPGA[6] GPGA[6] BPGA[6] 5 PGAFS[1] RLCDACRNG CDSREF[1] 3/4 3/4 INTM[1] 3/4 0 0 0 0 0 RO[5] GO[5] BO[5] RGBO[5] RPGA[5] GPGA[5] BPGA[5] 4 PGAFS[0] 0 CDSREF[0] 3/4 3/4 INTM[0] 3/4 PSENNEG 0 0 0 0 RO[4] GO[4] BO[4] RGBO[4] RPGA[4] GPGA[4] BPGA[4] 3 1 VRLCEXT RLVC[3] 3/4 3/4 RLCINT 3/4 VDEL[2] 0 0 0 0 RO[3] GO[3] BO[3] RGBO[3] RPGA[3] GPGA[3] BPGA[3] 2 1 INVOP RLVC[2] 3/4 3/4 1 3/4 VDEL[1] 0 0 0 0 RO[2] GO[2] BO[2] RGBO[2] RPGA[2] GPGA[2] BPGA[2] 1 CDS 1 RLVC[1] 3/4 3/4 0 EN 1 RLVC[0] 3/4 3/4
000001 Setup Reg 1 000010 Setup Reg 2 000011 Setup Reg 3 000100 Software Reset 000101 Auto-cycle Reset 000110 Setup Reg 4 000111 Revision Number 001000 Setup Reg 5 001001 Setup Reg 6 001010 Reserved 001011 Reserved 001100 Reserved 100000 Red Offset Value 100001 Green Offset Value 100010 Blue Offset Value 100011 RGB Offset Value 101000 Red PGA Gain 101001 Green PGA Gain 101010 Blue PGA Gain 101011 RGB PGA Gain
ACYCNRLC LINEBYLINE 3/4 VDEL[0] 0 0 0 0 RO[1] GO[1] BO[1] RGBO[1] RPGA[1] GPGA[1] BPGA[1] 3/4 VSMPDET 0 0 0 0 RO[0] GO[0] BO[0] RGBO[0] RPGA[0] GPGA[0] BPGA[0]
RGBPGA[7] RGBPGA[6] RGBPGA[5] RGBPGA[4] RGBPGA[3] RGBPGA[2] RGBPGA[1] RGBPGA[0]
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HT82V42
* Register Map Description
Register
Bit No. 0
Bit Name EN
POR 1
Description 0: Complete power down 1: fully active Select correlated double sampling mode. 0: non-CDS mode 1: CDS mode Default 1 Default 1 Adjust PGA output to optimize the ADC range for different polarity sensor output signals. Zero differential PGA input signal gives. 00: Zero output (use for bipolar video) 01: Zero output 10: Full-scale positive output (use for negative going video) 11: Full-scale negative output (use for positive going video) Mode3 setting 1: Mode3 enable Digitally inverts the polarity of output data 0: negative going video gives negative going output 1: negative going video gives positive going output Setting this bit high, changes VRLC/VBIAS to Hi-Z, allowing VRLC/VBIAS to be driven from an external power source. Sets the output range of the RLCDAC. 0: RLCDAC ranges from 0 to AVDD. 1: RLCDAC ranges from 0 to VRT Sets the output latency for the ADC clock periods. 1 ADC clock=2 DCLK periods. Under mode3, 1 ADC clock=3 DCLK periods. 00: Minimum latency 01: Delay by 1 ADC clock 10: Delay by 2 ADC clock 11: Delay by 3 ADC clock Controls RLCDAC driving The VRLC pin defines the single ended signal reference voltage or Reset Level Clamp Voltage. Refer to the Electrical Characteristic section for details. Adjust reset timing under CDS mode 00: Advance 1 DCLK period 01: Normal 10: Retard 1 DCLK 11: Retard 2 DCLK Reserved Any write to this register will cause all functions to be reset. It is recommended to execute a software reset after each power on reset and before any other register writes. When this register is written, the reset function will be initiated immediately by an internal reset signal. If the DCLK exists, the internal reset signal will keep active for about 2 DCLK cycles. Otherwise, the device will keep in reset state all the time.
1 2 3 Setup Register 1
CDS Reserved Reserved
1 1 1
5~4
PGAFS[1:0]
0
6
Mode3
0
2
INVOP
0
3
VRLCEXT RLCDACRN G
0
Setup Register 2
5
1
7~6
DEL[1:0]
00
3~0
RLVC[3:0]
1111
Setup Register 3 5~ CDSREF[1:0] 01
7~6
Reserved
00
Software Reset
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Register Bit No. Bit Name POR Description Writing to this register will cause the auto-cycle counter to be reset to colour R. This function is only required when LINEBYLINE=1. When this register is written, the reset function will be initiated immediately by an internal reset signal. If the DCLK exists, the internal reset signal will keep active for about 2 DCLK cycles. Otherwise, the device will keep in reset state all the time. 0 LINEBYLINE 1 Select line by line mode 0: normal operation 1: line by line operation When LINEBYLINE=0, this bit has no effect When LINEBYLINE=1, this bit controls the function of the RLC/ACYC input signal and will control the multiplexer of the offset/gain register. 0: RLC/ACYC pin enabled for Reset Level Clamp, internal selection of input and offset/gain multiplexers. 1: Auto cycling enabled by pulsing the RLC/ACYC input pin. This bit is used to determine whether the Reset Level Clamping is used. 0: RLC disable 1: RLC enable Colour selection bits used for internal modes. 00: Red 01: Green 10: Blue 11: Reserved 0: Normal operation, signal on the CDSCLK2 input pin is applied directly to the Timing Control Block 1: Programmable CDSCLK2 detect circuit is enabled. An internal synchronization pulse is generated from the signal applied to the CDSCLK2 input pin and is applied to the Timing Control Block. When VSMPDEL=0, these bits have no effect. When VSMPDEL=1, these bits set the programmable delay from the detected edge of the signal on CDSCLK2. The internal generated pulse is delayed by VDEL DCLK periods from the detected edge. When VSMPDEL=0, this bit has no effect When VSMPDEL=1, this bit controls whether positive or negative edges are detected. 0: Negative edge on the CDSCLK2 pin is detected and used to generate an internal timing pulse 1: Positive edge on the CDSCLK2 pin is detected and used to generate an internal timing pulse Internal clock monitor. 0: normal active, OD[3:0] output ADC data. 1: internal clock test mode. Pin Setup Register 6 7 ClkMotr 0 OD3 OD2 OD1 OD0 ClkMotr=0 OD3 OD2 OD1 OD0 ClkMotr=1 INTVSMP Video sample clock ADC clock Reset sample clock
Auto-cycle Reset
1
ACYCNRLC
0
Setup Register 4
3
RLCINT
0
5~4
INTM[1:0]
00
0
VSMPDET
0
Setup Register 5
3~1
VDEL[2:0]
000
4
POSNNEG
0
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HT82V42
Register Red Offset Value Green Offset Value Blue Offset Value RGB Offset Value Red PGA gain Green PGA gain Blue PGA gain RGB PGA gain Bit No. 7~0 7~0 7~0 7~0 5~0 5~0 5~0 5~0 Bit Name RO GO BO RGBO RPGA GPGA BPGA RGBPGA POR 80 80 80 80 0 0 0 0 Red offset value Green offset value Blue offset value Writing to this register will overwrite the new value to the R/G/B Offset value Red PGA value Green PGA value Blue PGA value Writing to this register will overwrite the new value to the R/G/B PGA gain value Description
Application Circuits
Recommended External Components
Note:
1. All capacitors should be located as close to the HT82V42 as possible. 2. AGND and DGND should be connected as close to the HT82V42 as possible.
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HT82V42
Package Information
20-pin SSOP (209mil) Outline Dimensions
20
A
11
B
1
C C'
10
G H
D E F
=
* MO-150
Symbol A B C C D E F G H a
Dimensions in mm Min. 7.40 5.00 0.22 6.90 3/4 3/4 0.05 0.55 0.09 0 0.65 3/4 3/4 3/4 3/4 Nom. 3/4 3/4 3/4 3/4 Max. 8.20 5.60 0.33 7.50 2.00 3/4 3/4 0.95 0.21 8
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HT82V42
20-pin TSSOP Outline Dimensions
20
11 E1
1
10
D A e B y A1 L A2 C
E
G
R
0 .1 0
(4 C O R N E R S )
Symbol A A1 A2 B C D E E1 e L y q
Dimensions in mm Min. 1.05 0.05 0.95 3/4 0.13 6.4 6.3 4.3 3/4 0.45 3/4 0 Nom. 3/4 3/4 3/4 0.22 3/4 3/4 3/4 3/4 0.65 3/4 3/4 3/4 Max. 1.2 0.15 1.05 3/4 0.17 6.6 6.5 4.5 3/4 0.75 0.1 8
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Product Tape and Reel Specifications
Reel Dimensions
T2 D
A
B
C
T1
SSOP 20N (209mil) Symbol A B C D T1 T2 TSSOP 20L Symbol A B C D T1 T2 Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness Dimensions in mm 330.01.0 100.01.5 13.0
+0.5/-0.2
Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness
Dimensions in mm 330.01.0 100.01.5 13.0
+0.5/-0.2
2.00.5 16.8
+0.3/-0.2
22.20.2
2.00.5 16.4
+0.3/-0.2
19.1 max.
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Carrier Tape Dimensions
D
E F W C
P0
P1
t
B0
D1
P A0
K0
R e e l H o le p a c k a g e p in 1 a n d th e r e e l h o le s a r e lo c a te d o n th e s a m e s id e . IC
SSOP 20N (209mil) Symbol W P E F D D1 P0 P1 A0 B0 K0 t C TSSOP 20L Symbol W P E F D D1 P0 P1 A0 B0 K0 t C Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Description Carrier Tape Width Dimensions in mm 16.00.3 8.00.1 1.750.10 7.50.1 1.5 1.5
+0.1/-0.0 +0.1/-0.0
Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width
Dimensions in mm 16.0
+0.3/-0.1
12.00.1 1.750.10 7.50.1 1.5 1.50
+0.1/-0.0 +0.25/-0.00
4.00.1 2.00.1 7.10.1 7.20.1 2.00.1 0.300.05 13.30.1
4.00.1 2.00.1 6.80.1 6.90.1 1.60.1 0.300.05 13.30.1 23 November 20, 2009
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HT82V42
Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Taipei Sales Office) 4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan Tel: 886-2-2655-7070 Fax: 886-2-2655-7373 Fax: 886-2-2655-7383 (International sales hotline) Holtek Semiconductor Inc. (Shenzhen Sales Office) 5F, Unit A, Productivity Building, No.5 Gaoxin M 2nd Road, Nanshan District, Shenzhen, China 518057 Tel: 86-755-8616-9908, 86-755-8616-9308 Fax: 86-755-8616-9722 Holtek Semiconductor (USA), Inc. (North America Sales Office) 46729 Fremont Blvd., Fremont, CA 94538, USA Tel: 1-510-252-9880 Fax: 1-510-252-9885 http://www.holtek.com
Copyright O 2009 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holteks products are not authorized for use as critical components in life support devices or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
Rev. 1.00
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November 20, 2009

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