a
FEATURES
14-Bit 10 MSPS A/D Converter
No Missing Codes Guaranteed
3-Channel Operation Up to 10 MSPS
1-Channel Operation Up to 7 MSPS
Correlated Double Sampling
1-6x Programmable Gain
300 mV Programmable Offset
Input Clamp Circuitry
Internal Voltage Reference
Multiplexed Byte-Wide Output (8+6 Format)
3-Wire Serial Digital Interface
+3/+5 V Digital I/O Compatibility
28-Lead SOIC Package
Low Power CMOS: 330 mW (Typ)
Power-Down Mode: <1 mW
APPLICATIONS
Flatbed Document Scanners
Film Scanners
Digital Color Copiers
Multifunction Peripherals
Complete 14-Bit
CCD/CIS Signal Processor
AD9814
PRODUCT DESCRIPTION
The AD9814 is a complete analog signal processor for CCD
imaging applications. It features a 3-channel architecture de-
signed to sample and condition the outputs of trilinear color
CCD arrays. Each channel consists of an input clamp, Corre-
lated Double Sampler (CDS), offset DAC and Programmable
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 sen-
sors, 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 regis-
ters are programmed through a 3-wire serial interface, and pro-
vide adjustment of the gain, offset, and operating mode.
The AD9814 operates from a single +5 V power supply, typi-
cally consumes 330 mW of power, and is packaged in a 28-lead
SOIC.
FUNCTIONAL BLOCK DIAGRAM
AVDD
AVSS
CML
CAPT
CAPB
AVDD
AVSS
DRVDD
DRVSS
VINR
CDS
PGA
BANDGAP
REFERENCE
AD9814
OEB
9-BIT
DAC
VING
CDS
PGA
3:1
MUX
14-BIT
ADC
14
14:8
MUX
8
DOUT
9-BIT
DAC
CONFIGURATION
REGISTER
MUX
REGISTER
6
RED
GREEN
BLUE
RED
GREEN
BLUE
DIGITAL
CONTROL
INTERFACE
GAIN
REGISTERS
VINB
CDS
PGA
SCLK
SLOAD
SDATA
9-BIT
DAC
INPUT
CLAMP
BIAS
OFFSET
9
OFFSET
REGISTERS
CDSCLK1
CDSCLK2
ADCCLK
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: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
AD [ ANALOG DEVICES ]
