AD9845B Datasheet, PDF (1/24 Pages) Analog Devices – Complete 12-Bit 30 MSPS CCD Signal Processor

FEATURES
Pin Compatible with AD9845A Designs
12-Bit 30 MSPS A/D Converter
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
Preblanking Function
Auxiliary Inputs with VGA and Input Clamp
3-Wire Serial Digital Interface
3 V Single-Supply Operation
Low Power: 153 mW @ 3 V Supply
Space-Saving 48-Lead LQFP Package
APPLICATIONS
High Performance Digital Still Cameras
Industrial/Scientific Imaging
Complete 12-Bit 30 MSPS
CCD Signal Processor
AD9845B
GENERAL DESCRIPTION
The AD9845B is an improved version of the AD9845A CCD
signal processor. It features a 30 MHz single-channel architec-
ture designed to sample and condition the outputs of interlaced
and progressive scan area CCD arrays. The AD9845B’s signal
chain consists of an input clamp, a correlated double sampler
(CDS), PxGA, a digitally controlled VGA, a black level clamp,
and a 12-bit A/D converter. Additional input modes are also
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 AD9845B operates from a single 3 V power supply, typi-
cally dissipates 153 mW, and is packaged in a 48-lead LQFP.
CCDIN
CLPDM
AUX1IN
AUX2IN
FUNCTIONAL BLOCK DIAGRAM
AVDD
AVSS
HD
VD
VRT
VRB PBLK
4dB ؎ 6dB
CDS
PxGA
CLP
6
2:1
MUX
BUF
CLP
AD9845B
COLOR
STEERING
2:1
MUX
2dB~36dB
VGA
10
BAND GAP
REFERENCE
12
ADC
CLP
CONTROL
REGISTERS
DIGITAL
INTERFACE
8
BLK CLAMP
LEVEL
INTERNAL
TIMING
DRVDD
DRVSS
DOUT
CLPOB
DVDD
DVSS
SL
SCK SDATA
SHP SHD DATACLK
REV. A
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone] © 2003 Analog Devices, Inc. All rights reserved.