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XRD98L59AIG

CCD Image Digitizers with CDS, PGA and 10-Bit A/D

Exar Corporation 

XRD98L59

CCD Image Digitizers with

CDS, PGA and 10-Bit A/D

FEATURES

• 10-bit Resolution ADC

• 20MHz Sampling Rate

• Programmable Gain: 6dB to 38dB PGA

(2x to 80x)

• Improved Digitally Controlled Offset-Calibration

with Pixel Averager and Hot Pixel Clipper

• DNS Filter Removes Black Level Digital Noise

• Widest Black Level Calibration Range at

Maximum Gain

• Manual Control of Offset DAC via Serial Port for

Use with High Speed Scanners

• 2ns/step Programmable Aperture Delay on SPIX

and SBLK

• Single 2.7V to 3.6V Power Supply

•

Low Power for Battery Operation:120mW @ V =3V

DD

January 2001-2

• 5µA Typical Stand By Mode Current

• Three-State Digital Outputs

• 2,000V ESD Protection

• 28-pin TSSOP Package

APPLICATIONS

• Digital Still Cameras

• Digital Camcorders

• PC Video Cameras

• CCTV/Security Cameras

• Industrial/Medical Cameras

• 2D Bar Code Readers

• High Speed Scanners

• Digital Copiers

GENERAL DESCRIPTION

The XRD98L59 is a complete low power CCD Image

Digitizer for digital, motion and still cameras. The

product includes a high bandwidth differential Corre-

lated Double Sampler (CDS), 8-bit digitally Program-

mable Gain Amplifier (PGA), 10-bit Analog-to-Digital

Converter (ADC) and improved digitally controlled

black level auto-calibration circuitry with pixel averager

hot pixel clipper, and a DNS filter.

The Correlated Double Sampler (CDS) subtracts the

CCD output signal black level from the video level.

Common mode signal and power supply noise are

rejected by the differential CDS input stage.

The PGA is digitally controlled with 8-bit resolution on

a linear dB scale, resulting in a gain range of 6dB to

38dB with 0.125dB per LSB of the gain code.

The auto calibration circuit compensates for any inter-

nal offset of the XRD98L59 as well as black level offset

from the CCD.

The PGA and black level auto-calibration are con-

trolled through a simple 3-wire serial interface. The

timing circuitry is designed to enable users to select a

wide variety of available CCD and image sensors for

their applications.

The XRD98L59 has direct access to the ADC input for

digitizing other analog signals. The XRD98L59 is

packaged in 28-lead surface mount TSSOP to reduce

space and weight, and is suitable for hand-held and

portable applications.

ORDERING INFORMATION

Part No.

XRD98L59AIG

Package

28-Lead TSSOP

Operating

Maximum

Temperature Range Power Supply Sampling Rate

-40°C to 85°C

3.0V

20 MSPS

Rev. 2.00

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

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