AD9895_15 Datasheet, PDF (1/58 Pages) Analog Devices – CCD Signal Processors with Precision Timing Generator

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CCD Signal Processors with
Precision Timing^™ Generator
AD9891/AD9895
FEATURES
AD9891: 10-Bit 20 MHz Version
AD9895: 12-Bit 30 MHz Version
Correlated Double Sampler (CDS)
4 ؎6 dB Pixel Gain Amplifier (PxGA^®)
2 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA)
10-Bit 20 MHz A/D Converter (AD9891)
12-Bit 30 MHz A/D Converter (AD9895)
Black Level Clamp with Variable Level Control
Complete On-Chip Timing Generator
Precision Timing Core with 1 ns Resolution
On-Chip 5 V Horizontal and RG Drivers
2-Phase and 4-Phase H-Clock Modes
4-Phase Vertical Transfer Clocks
Electronic and Mechanical Shutter Modes
On-Chip Driver for External Crystal
On-Chip Sync Generator with External Sync Option
64-Lead CSPBGA Package
APPLICATIONS
Digital Still Cameras
Digital Video Camcorders
Industrial Imaging
PRODUCT DESCRIPTION
The AD9891 and AD9895 are highly integrated CCD signal
processors for digital still camera applications. Both include a
complete analog front end with A/D conversion combined with
a full-function programmable timing generator. A Precision
Timing core allows adjustment of high speed clocks with 1 ns
resolution at 20 MHz operation and 700 ps resolution at 30
MHz operation.
The AD9891 is specified at pixel rates of up to 20 MHz, and
the AD9895 is specified at 30 MHz. The analog front end
includes black level clamping, CDS, PxGA, VGA, and a 10-Bit
or 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 64-lead CSPBGA, the AD9891 and
AD9895 are specified over an operating temperature range of
–20°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
CCDIN
VRT VRB
CDS
4dB ؎ 6dB
PxGA
2dB TO 36dB
VGA
VREF
AD9891/AD9895
ADC
10 OR 12
DOUT
CLAMP
RG
H1–H4
V1–V4
VSG1–VSG8
HORIZONTAL
4
DRIVERS
4
V-H
8
CONTROL
INTERNAL CLOCKS
CLAMP
PRECISION
TIMING
GENERATOR
SYNC
GENERATOR
INTERNAL
REGISTERS
DCLK
CLPOB/PBLK
FD/LD
MSHUT
STROBE
CLO
VSUB SUBCK
HD VD SYNC CLI
SL SCK DATA
PxGA is a registered trademark and Precision Timing is a trademark of Analog Devices, Inc.
REV. A
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. 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: [phone]
www.analog.com
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© Analog Devices, Inc., 2002