AD AD9994

12-Bit CCD Signal Processor with
Precision Timing TM Generator
AD9994
GENERAL DESCRIPTION
FEATURES
10-phase or 12-phase vertical transfer clocking
Supports 4-field and 5-field CCD readout
Correlated double sampler (CDS)
6 dB to 42 dB 10-bit variable gain amplifier (VGA)
12-bit 36 MHz A/D converter
Black level clamp with variable level control
Complete on-chip timing generator
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 support
On-chip driver for external crystal
On-chip sync generator with external sync input
64-lead LFCSP package (9 mm × 9 mm, 0.5 mm pitch)
The AD9994 is a highly integrated CCD signal processor for
digital still camera applications. It includes a complete analog
front end with A/D conversion, combined with a full-function
programmable timing generator. The timing generator is capable
of up to 12-phase vertical clocking to support advanced CCDs
with 4-field and 5-field readout. A Precision Timing core allows
adjustment of high speed clocks with approximately 600 ps
resolution at 36 MHz operation.
The AD9994 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.
APPLICATION
Packaged in a 64-lead LFCSP, the AD9994 is specified over an
operating temperature range of –25°C to +85°C.
Digital still cameras
For more information about the AD9994, email Analog Devices
at [email protected]
FUNCTIONAL BLOCK DIAGRAM
REFT REFB
AD9994
6dB TO 42dB
CCDIN
CDS
VREF
12
12-BIT
ADC
VGA
–3dB, 0dB, +3dB, +6dB
DOUT
CLAMP
DCLK
INTERNAL CLOCKS
RG
HL
4
HORIZONTAL
DRIVERS
PRECISION
TIMING
GENERATOR
MSHUT
STROBE
H1 TO H4
VSG1 TO VSG8
(VSG1 TO VSG6)
10 OR 12
8 OR 6
VERTICAL
TIMING
CONTROL
VSUB
VSUB
SYNC
GENERATOR
HD
VD SYNC CLI
INTERNAL
REGISTERS
CLO
SL
SCK DATA
04972-0-001
V1 TO V10
(V1 TO V12)
Figure 1.
Rev. Sp0
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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.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
AD9994
© 2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D04972F–0–10/04(Sp0)
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