Analog Devices AD9994 Sp0 Datasheet

12-Bit CCD Signal Processor with

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)

APPLICATION

Digital still cameras

Precision Timing

TM

Generator

AD9994

GENERAL DESCRIPTION

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.

Packaged in a 64-lead LFCSP, the AD9994 is specified over an
operating temperature range of –25°C to +85°C.

For more information about the AD9994, email Analog Devices
at [e-mail].

FUNCTIONAL BLOCK DIAGRAM

6dB TO 42dB

CCDIN

RG

HL

H1 TO H4

V1 TO V10

(V1 TO V12)

VSG1 TO VSG8

(VSG1 TO VSG6)

Rev. Sp0

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.
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.

CDS VGA

–3dB, 0dB, +3dB, +6dB

HORIZONTAL

4

10 OR 12

8 OR 6

DRIVERS

VERTICAL

TIMING

CONTROL

REFT REFB

VREF

CLAMP

INTERNAL CLOCKS

PRECISION

TIMING

GENERATOR

SYNC

GENERATOR

HD VD SYNC

Figure 1.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

12-BIT

ADC

CLI

AD9994

12

DOUT

DCLK

MSHUT
STROBE

INTERNAL

REGISTERS

CLOVSUB VSUB

SL SCK DATA

www.analog.com

04972-0-001

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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