AD9822 Analog Devices, AD9822 Datasheet
AD9822
Manufacturer Part Number
AD9822
Description
Complete 14-Bit CCD/CIS Signal Processor
Manufacturer
Analog Devices
Datasheet
1.AD9822.pdf
(15 pages)
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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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
REV. A
FEATURES
14-Bit 15 MSPS A/D Converter
No Missing Codes Guaranteed
3-Channel Operation Up to 15 MSPS
1-Channel Operation Up to 12.5 MSPS
Correlated Double Sampling
1–6x Programmable Gain
Input Clamp Circuitry
Internal Voltage Reference
Multiplexed Byte-Wide Output (8+6 Format)
3-Wire Serial Digital Interface
3 V/5 V Digital I/O Compatibility
28-Lead SOIC or SSOP
Low Power CMOS: 385 mW (Typ)
Power-Down Mode: <1 mW
APPLICATIONS
Flatbed Document Scanners
Film Scanners
Digital Color Copiers
Multifunction Peripherals
350 mV Programmable Offset
OFFSET
VINR
VING
VINB
AVDD
AVSS
CDSCLK1
CLAMP
INPUT
BIAS
CDS
CDS
CDS
CML
CDSCLK2
FUNCTIONAL BLOCK DIAGRAM
9-BIT
9-BIT
9-BIT
DAC
DAC
DAC
CAPT
PGA
PGA
PGA
9
6
CAPB
GREEN
GREEN
MUX
BLUE
BLUE
RED
3:1
RED
PRODUCT DESCRIPTION
The AD9822 is a complete analog signal processor for CCD
imaging applications. It features a 3-channel architecture
designed to sample and condition the outputs of trilinear
color CCD arrays. Each channel consists of an input clamp,
Correlated Double Sampler (CDS), offset DAC and Pro-
grammable Gain Amplifier (PGA), multiplexed to a high
performance 14-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 14-bit digital output is multiplexed into an 8-bit output
word that is accessed using two read cycles. The internal
registers are programmed through a 3-wire serial interface, and
provide adjustment of the gain, offset, and operating mode.
The AD9822 operates from a single 5 V power supply, typically
consumes 385 mW of power, and is packaged in a 28-lead SOIC
or SSOP.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
CONFIGURATION
AVDD
REGISTER
REGISTER
GAIN
REGISTERS
OFFSET
REGISTERS
MUX
REFERENCE
BANDGAP
AVSS
14-BIT
ADC
CCD/CIS Signal Processor
ADCCLK
DRVDD
14
World Wide Web Site: http://www.analog.com
AD9822
INTERFACE
CONTROL
DIGITAL
MUX
14:8
DRVSS
8
Complete 14-Bit
OEB
DOUT
SCLK
SLOAD
SDATA
© Analog Devices, Inc., 1999
AD9822
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