ANALOG DEVICES AD9978 Service Manual

Dual-Channel, 14-Bit CCD Signal

FEATURES

Dual AFE channels

1.8 V analog and digital core supply voltage
Serial data output with reduced range LVDS outputs
Differential analog inputs
CDS or SHA configuration (CDS bypass) with

−3 dB, 0 dB, +3 dB, and +6 dB gain
6 dB to 42 dB, 10-bit variable gain amplifier (VGA)
14-bit, 65 MHz analog-to-digital converter (ADC)
Black level clamp with variable level control
Precision Timing core with 240 ps resolution @ 65 MHz

APPLICATIONS

Digital video cameras
Digital still cameras
Digital copiers
Multifunction printers
High speed industrial cameras

Processor with Precision Timing Core

AD9978

GENERAL DESCRIPTION

The AD9978 is a highly integrated, dual-channel CCD signal
processor for high speed digital video camera applications. Each
channel is specified at pixel rates of up to 65 MHz and consists of
a complete analog front end with ADC conversion. The Precision
Timin g™ core allows adjustment of the correlated double sampler
(CDS) and sample-and-hold amplifier (SHA) clocks with 240 ps
resolution at 65 MHz operation. The AD9978 also contains a
reduced range, low voltage differential signaling (LVDS) interface
for the dual-channel data outputs.

Each analog front end includes black level clamping, a CDS,
a VGA, and a 65 MHz, 14-bit ADC. Operation is programmed
using a 3-wire serial interface.

Packaged in a space-saving, 6 mm × 6 mm, 40-lead LFCSP, the
AD9978 is specified over an operating temperature range of

−25°C to +85°C.

FUNCTIONAL BLOCK DIAGRAM

AD9978

INP_A

INM_A

INP_B

INM_B

CDS/
SHA

–3dB, 0dB, + 3dB, +6dB

–3dB, 0dB, + 3dB, +6dB

CDS/
SHA

6dB TO 42dB

VGA

6dB TO 42dB

VGA

INTERNAL CLOCKS

PRECISION

TIMING

CORE

SYNC

GENERATOR

VDHD

Figure 1.

For more information about the AD9978, contact Analog Devices via email at [e-mail].

VREF

ADC

CLAMP

CLAMP

ADC

INTERNAL

REGISTERS

SL

SERIALIZER

SDATA

LVDS

SCK

DOUT0P
DOUT0N
DOUT1P
DOUT1N
TCLKP
TCLKN
DOUT2P
DOUT2N
DOUT3P
DOUT3N

CLICLK_OUT

6810-001

Rev. SpB

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2007–2008 Analog Devices, Inc. All rights reserved.

AD9978

NOTES

©2008 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06810F-0-9/08(SpB)

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