12-Bit CCD Signal Processor with
Precision Timing™ Generator
AD9995
FEATURES
GENERAL DESCRIPTION
6-PhaseVerticalTransfer Clock Support
Correlated Double Sampler (CDS)
6 dB to 42 dB 10-BitVariable Gain Amplifier (VGA)
12-Bit 36 MHz A/D Converter
Black Level Clamp withVariable Level Control
Complete On-ChipTiming Generator
PrecisionTiming Core with <600 ps Resolution
On-Chip 3V 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
The AD9995 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 PrecisionTiming core allows adjustment of high speed clocks
with less than 600 ps resolution at 36 MHz operation.
The AD9995 is specified at pixel rates of up to 36 MHz.The
analog front end includes black level clamping, CDS,VGA,
and a 12-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.
APPLICATIONS
Packaged in a space-saving 56-lead LFCSP, the AD9995 is speci-
fied over an operating temperature range of –20°C to +85°C.
Digital Still Cameras
DigitalVideo Camcorders
Industrial Imaging
FUNCTIONAL BLOCK DIAGRAM
VRT VRB
AD9995
6dBTO 42dB
VGA
VREF
12
12-BIT
ADC
CDS
DOUT
DCLK
CCDIN
CLAMP
INTERNAL CLOCKS
RG
PRECISION
TIMING
GENERATOR
HORIZONTAL
DRIVERS
MSHUT
4
STROBE
H1–H4
6
V1–V6
V-H
CONTROL
SYNC
GENERATOR
INTERNAL
REGISTERS
5
VSG1–VSG5
VSUB SUBCK
HD
VD SYNC CLI CLO SL SCK DATA
REV. 0
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