AD9845A Datasheet, PDF (1/22 Pages) Analog Devices – Complete 12-Bit 30 MSPS CCD Signal Processor

a
FEATURES
30 MSPS Correlated Double Sampler (CDS)
4 dB ؎ 6 dB 6-Bit Pixel Gain Amplifier (PxGA^®)
2 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA)
Low Noise Clamp Circuits
Analog Preblanking Function
12-Bit 30 MSPS A/D Converter
Auxiliary Inputs with VGA and Input Clamp
3-Wire Serial Digital Interface
3 V Single Supply Operation
Low Power: 140 mW @ 3 V Supply
48-Lead LQFP Package
APPLICATIONS
Digital Still Cameras
Digital Video Camcorders
Industrial Imaging
Complete 12-Bit 30 MSPS
CCD Signal Processor
AD9845A
PRODUCT DESCRIPTION
The AD9845A is a complete analog signal processor for CCD
applications. It features a 30 MHz single-channel architecture
designed to sample and condition the outputs of interlaced and
progressive scan area CCD arrays. The AD9845A’s signal chain
consists of an input clamp, correlated double sampler (CDS),
Pixel Gain Amplifier (PxGA), digitally controlled variable gain
amplifier (VGA), black level clamp, and a 12-bit A/D converter.
Additional input modes are provided for processing analog
video signals.
The internal registers are programmed through a 3-wire
serial digital interface. Programmable features include gain
adjustment, black level adjustment, input configuration, and
power-down modes.
The AD9845A operates from a single 3 V power supply, typi-
cally dissipates 140 mW, and is packaged in a 48-lead LQFP.
CCDIN
CLPDM
AUX1IN
AUX2IN
PBLK
FUNCTIONAL BLOCK DIAGRAM
AVDD
AVSS
HD
VD
CLPOB
4dB ؎ 6dB
CDS
PxGA
CLP
6
2:1
MUX
BUF
CLP
COLOR
STEERING
2:1
MUX
2dB~36dB
VGA
CLP
12
ADC
OFFSET
10
DAC
8
CONTROL
REGISTERS
BANDGAP
REFERENCE
INTERNAL
BIAS
AD9845A
DIGITAL
INTERFACE
INTERNAL
TIMING
DRVDD
DRVSS
DOUT
VRT
VRB
CML
DVDD
DVSS
SL
SCK SDATA
SHP SHD DATACLK
PxGA is a registered trademark of Analog Devices, Inc.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone]
© Analog Devices, Inc., 2001