HT82V42 Datasheet, PDF (1/24 Pages) Holtek Semiconductor Inc – CIS Analog Signal Processor

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 won¢t miss codes
· 8-bit programmable gain
· Correlated Double Sampling
Applications
· Flatbed document scanners
· Film scanners
· ±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
· Digital color copiers
· Multifunction peripherals
General Description
The HT82V42 is a complete analog signal processor for
CCD imaging applications. It features a 1-channel archi-
tecture 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 ampli-
fiers may be disabled for use with sensors such as Con-
tact 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 se-
rial interface, which provides gain, offset and operating
mode adjustments. The HT82V42 operates from a sin-
gle 3.3V power supply and typically consumes 188mW
of power.
Block Diagram
AVDD AVSS VRB VRT VRX
RPGA
GPGA
BPGA
3:1
MUX
VIN
CDS
+
PGA
RDAC
GDAC
BDAC
3:1
MUX
10-Bit
DAC
AVSS
DVDD1
DVDD2 DGND
BANDGAP
Reference
16-Bit
16
ADC
16 : 4
4
MUX
OD[0]
OD[1]
OD[2]
OD[3]/SDO
VRLC/
BAIS
Clamp
DAC
Configuration
Register
RED
GREEN
BLUE
RED
GREEN
BLUE
Offset
Registers
MUX
Register
Gain
Registers
Digital
Control
Interface
SCLK
SEN
SDI
Rev. 1.00
CDSCLK2
DCLK
1
ACYC
November 20, 2009