XRD98L61(2000) View Datasheet(PDF) - Exar Corporation

Part Name

Description

Manufacturer

XRD98L61
(Rev.:2000)

CCD Image Digitizers with CDS, PGA and 12-Bit A/D

Exar Corporation 

Preliminary

XRD98L61

CCD Image Digitizers with

CDS, PGA and 12-Bit A/D

FEATURES

• 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

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

• 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.

ORDERING INFORMATION

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.

Part No.

XRD98L61AIV

Package Temperature Range

48-Pin TQFP

-40°C to 85°C

Operating

Power Supply

3.0V

Maximum

Sampling Rate

20 MSPS

Rev. P4.00

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

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