Dual-Channel, 14-Bit HD Image Signal

Processor with Precision Timing Core

AD9978A

Rev. Sp0

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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, 75 MHz analog-to-digital converter (ADC)

Black level clamp with variable level control

Precision Timing core with 210 ps resolution @ 75 MHz

APPLICATIONS

Digital video cameras

Digital still cameras

Digital copiers

Multifunction printers

High speed industrial cameras

GENERAL DESCRIPTION

The AD9978A is a highly integrated, dual-channel, charge-

coupled device (CCD) signal processor for high speed digital

video camera applications. Each channel is specified at pixel

rates of up to 75 MHz and consists of a complete analog front

end (AFE) with ADC conversion. The Precision Timing™ core

allows adjustment of the correlated double sampler (CDS) and

sample-and-hold amplifier (SHA) clocks with 210 ps resolution at

75 MHz operation. The AD9978A 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 75 MHz, 14-bit analog-to-digital converter (ADC).

Operation is programmed using a 3-wire serial interface.

Packaged in a space-saving, 6 mm × 6 mm, 40-lead LFCSP, the

AD9978A is specified over an operating temperature range of

−25°C to +85°C.

FUNCTIONAL BLOCK DIAGRAM

INP_A

INM_A

INM_B

INP_B

–3dB, 0dB, +3dB, +6dB

–3dB, 0dB, +3dB, +6dB

CDS/

SHA

VGA

6dB TO 42dB

CLAMP

ADC

VD

HD

SDATA

SCK

CLI

CLK_OUT

DOUT0P

DOUT0N

DOUT1P

DOUT1N

DOUT2P

DOUT2N

DOUT3P

DOUT3N

TCLKP

TCLKN

SL

CLAMP

VREF

ADC

6dB TO 42dB

CDS/

SHA

VGA

Precision

Timing

CORE

SYNC

GENERATOR

INTERNAL CLOCKS

INTERNAL

REGISTERS

LVDS

SERIALIZER

AD9978A

Figure 1.

For more information about the AD9978A, contact Analog Devices, Inc., at afe.ccd@analog.com.