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AD9991
10-Bit CCD Signal Processor with
Precision Timing
™
Generator
FEATURES
6-Phase Vertical Transfer Clock Support
Correlated Double Sampler (CDS)
6 dB to 42 dB 10-Bit Variable Gain Amplifi er (VGA)
10-Bit 27 MHz A/D Converter
Black Level Clamp with Variable Level Control
Complete On-Chip Timing Generator
Precision Timing Core with 800 ps Resolution
On-Chip 3 V Horizontal and RG Drivers
2-Phase and 4-Phase H-Clock Modes
Electronic and Mechanical Shutter Modes
On-Chip Driver for External Crystal
On-Chip Sync Generator with External Sync Input
56-Lead LFCSP Package
APPLICATIONS
Digital Still Cameras
Digital Video Camcorders
Industrial Imaging
GENERAL DESCRIPTION
The AD9991 is a highly integrated CCD signal processor for
digital still camera and camcorder applications. It includes a
complete analog front end with A/D conversion, combined with a
full-function programmable timing generator. The timing genera-
tor is capable of supporting both 4- and 6-phase vertical clocking.
A Precision Timing core allows adjustment of high speed clocks
with 800 ps resolution at 27 MHz operation.
The AD9991 is specifi ed at pixel rates of up to 27 MHz. The
analog front end includes black level clamping, CDS, VGA,
and a 10-bit A/D converter. The timing generator provides all
the necessary CCD clocks: RG, H-clocks, V-clocks, sensor gate
pulses, substrate clock, and substrate bias control. Operation is
programmed using a 3-wire serial interface.
Packaged in a space-saving 56-lead LFCSP, the AD9991 is speci-
fi ed over an operating temperature range of –20°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
AD9991
CDS VGA
CLAMP
10-BIT
ADC
10
DCLK
MSHUT
STROBE
CLOCLI
DOUT
VREF
6dB TO 42dB
HORIZONTAL
DRIVERS
V-H
CONTROL
4
6
5
RG
H1–H4
V1–V6
VSG1–VSG5
VRT VRB
PRECISION
TIMING
GENERATOR
SYNC
GENERATOR
INTERNAL CLOCKS
VSUB SUBCK HD VD SYNC
INTERNAL
REGISTERS
SL SCK DATA
CCDIN
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