
REV. 0
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AD9937 CCD Signal Processor with
Precision Timing
Generator
FEATURES
12 MSPS Correlated Double Sampler (CDS)
10-Bit 12 MHz A/D Converter
No Missing Codes Guaranteed
6 dB to 40 dB Variable Gain Amplifier (VGA)
Black Level Clamp with Variable Level Control
Complete On-Chip Timing Generator
Precision Timing Core with 1.7 ns Resolution
On-Chip: 6-Channel Horizontal and 1-Channel RS Drivers
4-Phase Vertical Transfer Clocks
Electronic and Mechanical Shutter Modes
On-Chip Sync Generator with External Sync Option
APPLICATIONS
Digital Still Cameras
Industrial Imaging
FUNCTIONAL BLOCK DIAGRAM
AD9937
RS
H1 A–D
H2 A, B
V1 A/B
V2
V3 A/B
V4
TG1A
TG1B
TG3A
TG3B
CDS
VGA
CLAMP
ADC
10
VCLK
VCKM
DOUT
VREF
6dB TO 40dB
HORIZONTAL
DRIVERS
V-H
CONTROL
6
4
4
REFT REFB
PRECISION
TIMING
GENERATOR
SYNC
GENERATOR
INTERNAL CLOCKS
LM
OFD
HD
VD
INTERNAL
REGISTERS
SLD SCK SDA
GENERAL DESCRIPTION
The AD9937 is a highly integrated CCD signal processor. It
includes 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 1.7 ns resolution at 12 MHz operation.
The AD9937 is specified at pixel rates of up to 12 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: RS, H-clocks, V-clocks, sensor gate pulses,
and substrate charge reset pulse. Operation is programmed using a
3-wire serial interface.
The AD9937 is packaged in a 56-lead LFCSP and specified over
an operating temperature range of
–
25
°
C to +85
°
C.