VSP2232
SLAS320 – MAY 2001
CCD SIGNAL PROCESSOR
FOR DIGITAL CAMERAS
FEATURES
DESCRIPTION
D
CCD Signal Processing
– Correlated Double Sampling (CDS)
– Programmable Black Level Clamping
TheVSP2232isacompletemixed-signalprocessingIC
for digital cameras that provides signal conditioning and
analog-to-digital conversion for the output of a CCD
array. The primary CCD channel provides correlated
double sampling (CDS) to extract the video information
fromthepixels, a–6-dBto42-dBgainwithdigitalcontrol
for varying illumination conditions, and black level
clamping for an accurate black level reference.
D
D
Programmable Gain Amplifier (PGA)
– –6-dB to 42-dB Gain Ranging
10-Bit Digital Data Output
– Up to 36-MHz Conversion Rate
– No Missing Codes
D
D
76-dB Signal-to-Noise Ratio
Input signal clamping and offset correction of the input
CDS is also performed. The stable gain control is linear
in dB. Additionally, the black level is quickly recovered
after gain change.
Portable Operation
– Low Voltage: 2.7 V to 3.6 V
– Low Power: 130 mW (typ) at 3.0 V
– Standby Mode: 6 mW
The VSP2232Y is pin-to-pin compatible with the
VSP2262Y (12-bit 20 MHz) one-chip product.
The VSP2232Y is available in a 48-pin LQFP package
and operates from a single 3-V/3.3-V supply.
VSP2232 block diagram
CLPDM
SHP SHD
SLOAD SCLK SDATA
Serial Interface
RESET
ADCCK DRV
DD
V
CC
Input
Clamp
Timing Control
B(0–11)
Correlated
Double
Sampling (CDS)
Programmable
Gain Amplifier
(PGA)
12-Bit
Digital
Output
Output
Latch
Analog-to-Digital
Converter
–6 to 42 dB
Optical Black (OB)
Level Clamping
CCD
Output
Signal
Preblanking
PBLK
Reference Voltage Generator
COB
CPLOB
BYPP2 BYP BYPM REFN CM REFP
DRVGND
GNDA
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright 2001, Texas Instruments Incorporated
1
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