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12-bit Resolution ADC, 30MHz Sampling Rate

10-bit Programmable Gain: 6dB to 36dB PGA

Pixel-by-pixel gain switching

Digitally Controlled Black Level Calibration with

Pixel Averager and Hot Pixel Clipper

DNS Filter Removes Black Level Digital Noise

Programmable Black Level, up to code 255

Black Level Calibration Range: 300 mV

Programmable Aperture Delays

1.0 ns/step for SBLK & SPIX

0.5 ns/step for ADCLK

Manual Control of Offset DACs via Serial Port

for use with High-speed Scanners

Single 2.7V to 3.6V Power Supply

Optimize power with external resistor to 100mW

Low Power for Battery Operation

100碌A(chǔ) Stand-by Mode Current

鈥?/div>

Three-state Digital Outputs

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3,000V ESD Protection

鈥?/div>

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 XRD98L63 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 Programmable

Gain Amplifier (PGA) with pixel rate gain switching, 12-

bit Analog-to-Digital Converter (ADC) and improved

digitally controlled black level auto-calibration circuitry

with programmable pixel averaging, hot pixel clipping,

and a Digital Noise Suppression (DNS) filter.

The Correlated Double Sampler (CDS) subtracts the

CCD output signal black level from the video level.

Common mode and power supply noise are rejected by

the differential CDS input stage.

The PGA is digitally controlled with 10-bit resolution on

a dB scale, resulting in a gain range of 6dB to 36dB with

0.047dB per LSB of the gain code. The PGA can be

programmed to switch gain every pixel, in a user

defined pattern of up to 4 different gains. Our propri-

etary control logic allows a camera system to set the

desired gain ratios for color balance. The system gain

can then be changed by writing to a single register,

and the color balance will be maintained.

The black level auto-calibration circuit averages the

results of the Optical Black pixels to compensate for

any internal offset of the XRD98L63 as well as black

level offset from the CCD. The calibration logic uses

proprietary digital filters to eliminate line-to-line offset

noise and noise due to hot pixels in the Optical Black

areas.

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 XRD98L63 is packaged in 48-lead TQFP to reduce

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

portable applications.

ORDERING INFORMATION

Part No.

XRD98L63AIV

Package

48-Pin TQFP

Temperature Range

-40擄C to 85擄C

Operating

Power Supply

2.7V to 3.6V

Maximum

Sampling Rate

30 MSPS

Rev.1.01

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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XRD98L63AIV Datasheet

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