AD9995_15 Datasheet, PDF (1/60 Pages) Analog Devices – 12-Bit CCD Signal Processor with Precision Timing Generator

12-Bit CCD Signal Processor with
Precision Timing ^™ Generator
AD9995
FEATURES
GENERAL DESCRIPTION
6-Phase Vertical Transfer Clock Support
The AD9995 is a highly integrated CCD signal processor for
Correlated Double Sampler (CDS)
digital still camera and camcorder applications. It includes a
6 dB to 42 dB 10-Bit Variable Gain Amplifier (VGA)
complete analog front end with A/D conversion, combined with a
12-Bit 36 MHz A/D Converter
full-function programmable timing generator. The timing genera-
Black Level Clamp with Variable Level Control
tor is capable of supporting both 4- and 6-phase vertical clocking.
Complete On-Chip Timing Generator
A Precision Timing core allows adjustment of high speed clocks
Precision Timing Core with <600 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
E _{56-Lead LFCSP Package}
APPLICATIONS
Digital Still Cameras
T _{Digital Video Camcorders}
Industrial Imaging
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.
Packaged in a space-saving 56-lead LFCSP, the AD9995 is speci-
fied over an operating temperature range of –20°C to +85°C.
LE _CCDIN
FUNCTIONAL BLOCK DIAGRAM
VRT VRB
CDS
6dB TO 42dB
VGA
VREF
AD9995
12
12-BIT
ADC
DOUT
O _RG
S _H1–H4
V1–V6
OB ^{VSG1–VSG5}
HORIZONTAL
4
DRIVERS
6
V-H
5
CONTROL
INTERNAL CLOCKS
CLAMP
PRECISION
TIMING
GENERATOR
SYNC
GENERATOR
INTERNAL
REGISTERS
DCLK
MSHUT
STROBE
VSUB SUBCK
HD VD SYNC CLI CLO SL SCK DATA
REV. 0
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