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Analog Devices - Complete 14-Bit CCD/CIS Signal Processor

Numéro de référence AD9822
Description Complete 14-Bit CCD/CIS Signal Processor
Fabricant Analog Devices 
Logo Analog Devices 





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AD9822 fiche technique
Complete 14-Bit
CCD/CIS Signal Processor
AD9822
FEATURES
GENERAL DESCRIPTION
14-bit 15 MSPS ADC
No missing codes guaranteed
3-channel operation up to 15 MSPS
1-channel operation up to 12.5 MSPS
Correlated double sampling
1–6× programmable gain
±350 mV programmable offset
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
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 programmable gain amplifier
(PGA) multiplexed to a high performance 14-bit ADC.
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,
consumes 385 mW of power typically, and is packaged in a
28-lead SOIC or SSOP.
FUNCTIONAL BLOCK DIAGRAM
AVDD AVSS
CML
CAPT
CAPB
AVDD
AVSS DRVDD DRVSS
VINR
VING
VINB
OFFSET
CDS
9-BIT
DAC
PGA
BAND GAP
REFERENCE
AD9822
CDS
PGA
3:1
MUX
14-BIT
ADC
14 14:8 8
MUX
9-BIT
DAC
CDS
INPUT
CLAMP
BIAS
9-BIT
DAC
PGA
6
9
CONFIGURATION
REGISTER
MUX
REGISTER
RED
GREEN
BLUE
RED
GREEN
BLUE
GAIN
REGISTERS
OFFSET
REGISTERS
DIGITAL
CONTROL
INTERFACE
CDSCLK1 CDSCLK2
ADCCLK
Figure 1.
OEB
DOUT
SCLK
SLOAD
SDATA
Rev. B
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.
Specifications subject to change without notice. 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 owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2005 Analog Devices, Inc. All rights reserved.

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