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12-bit Resolution ADC

20MHz Sampling Rate

10-bit Programmable Gain: 0dB to 36dB PGA

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

1ns/step Programmable Aperture Delay on SPIX,

SBLK and ADCLK

Manual Control of Offset DAC via Serial Port for

use with High-speed Scanners

Single 2.7V to 3.6V Power Supply

Optimize Power with External Resistor to 125mW

View Finder Mode, 6-bit Resolution, 25%

Less Power

Low Power for Battery Operation

鈥?/div>

XRD98L61

CCD Image Digitizers with

CDS, PGA and 12-Bit A/D

July 2000-4

Two Serial Controlled 8-bit D/A Converters

0.5mA Stand-by Mode Current

Three-state Digital Outputs

2,000V ESD Protection

48-pin TQFP Package

APPLICATIONS

鈥?/div>

Mega pixel Digital Still Cameras

Digital Camcorders

3 CCD Professional/Broadcast Camera

Line Scan Cameras

PC Video Cameras

CCTV/Security Cameras

Industrial/Medical Cameras

2D Bar Code Readers

High Speed Scanners

Digital Copiers

GENERAL DESCRIPTION

The XRD98L61 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), 10-bit digitally Program-

mable Gain Amplifier (PGA), 12-bit Analog-to-Digital

Converter (ADC) and improved digitally controlled

black level auto-calibration circuitry with program-

mable pixel averager, hot pixel clipper, and a DNS

filter.

Two 8-bit serial controlled digital-to-analog converter

(DACs) are provided to control external analog signals

(Iris, Focus, Flash, etc.)

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 10-bit resolution on

a linear dB scale, resulting in a gain range of 0dB to

36dB with 0.047dB per LSB of the gain code.

The auto calibration circuit compensates for any inter-

nal offset of the XRD98L61 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. Readback of the serial data regis-

ters is available from the digital output bus.

The XRD98L61 has direct access to the ADC and

PGA inputs for digitizing other analog signals.

The XRD98L61 is packaged in 48-lead TQFP to reduce

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

portable applications.

ORDERING INFORMATION

Part No.

XRD98L61AIV

Package

48-Pin TQFP

Temperature Range

-40擄C to 85擄C

Operating

Power Supply

3.0V

Maximum

Sampling Rate

20 MSPS

Rev. P4.00

EXAR

Corporation, 48720 Kato Road, Fremont, CA 94538

鈥?/div>

(510) 668-7000

鈥?/div>

FAX (510) 668-7017

鈥?/div>

www.exar.com

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XRD98L61AIV Datasheet

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