HT82V46 Datasheet, PDF (1/27 Pages) Holtek Semiconductor Inc – 16-Bit, 45MSPS, 3-Channel CCD/CIS Analog Signal Processor

HT82V46
16-Bit, 45MSPS, 3-Channel
CCD/CIS Analog Signal Processor
Features
• Operating voltage: 3.3V
• Guaranteed won’t miss codes
• 9-bit programmable gain
• Correlated Double Sampling
• 8-bit programmable offset
• Programmable clamp voltage
• 8-bit wide multiplexed data output format
• 8-bit only output mode
• 4-bit multiplexed nibble mode
• Internal voltage reference
• Programmable 4-wire serial interface
• Maximum Conversation rate up to 45 MSPS
• 28-pin SSOP package
Applications
• Flatbed document scanners
• Film scanners
• Digital color copiers
• Multifunction peripherals
General Description
The HT82V46 is a complete analog signal processor
for CCD imaging applications. It features a 3-channel
architecture designed to sample and condition the
outputs of tri-linear color CCD arrays. Each 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 8-bit
wide multiplexed format. The internal registers are
programmed through a 4-wire serial interface, which
provides gain, offset and operating mode adjustments.
The HT82V46 operates from a single 3.3V power
supply, typically consumes 528mW of power.
Block Diagram
CDS1
CDS2
ADCK
REFT
REFB
CML
VINR
VING
VINB
VRLC/VBIAS
CLP
RLC
RLC
RLC
C1S C2S
Timing Control
CDS
CDS
CDS
+
+
+
PGA
PGA
PGA
Bandgap
Reference
+
3:1
+
MUX
+
16-bit ¹⁶ 16:8:4 ⁸
ADC
MUX
Offset Offset Offset
DAC DAC DAC
RLC ⁴
DAC
9
8
2
Red
Green
Blue
Red
Green
Blue
PGA
REG
Offset
REG
Setup
REG1 ~ REG6
Serial
Control
Interface
OEB
OD[0:6]
OD[7]/SDO
SCK
SEN
SDI
AVDD
AVSS
AVSS
DVDD
DVDD
DVSS
Rev. 1.10
1
November 24, 2011