Exar Corporation XRD98L61AIV-F

Description
The XRD98L61 is a low-power CCD Image Digitizer designed for digital motion and still cameras. It includes a differential Correlated Double Sampler (CDS), 10-bit digitally Programmable Gain Amplifier (PGA), 12-bit Analog-to-Digital Converter (ADC), and digitally controlled black level auto-calibration circuitry with programmable pixel averager, hot pixel clipper, and DNS filter.
Two 8-bit serial controlled digital-to-analog converters (DACs) are provided to control external analog signals. The CDS subtracts the CCD output signal black level from the video level, rejecting common mode signal and power supply noise. The PGA has a digitally controlled 10-bit resolution on a linear dB scale, resulting in a gain range of 0dB to 36dB.
The auto-calibration circuit compensates for any internal offset of the XRD98L61 as well as black level offset from the CCD. The PGA and black level auto-calibration are controlled through a simple 3-wire serial interface. The timing circuitry enables users to select a wide variety of CCD and image sensors. Readback of the serial data registers is available from the digital output bus.
The XRD98L61 has direct access to the ADC and PGA inputs for digitizing other analog signals. It is packaged in a 48-lead TQFP to reduce space and weight, making it suitable for hand-held and portable applications.

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
Widest Black Level Calibration Range at Maximum Gain
DNS Filter Removes Black Level Digital Noise
Manual Control of Offset DAC via Serial Port for use with High-speed Scanners
1ns/step Programmable Aperture Delay on SPIX, SBLK and ADCLK Sampling Clocks
Single 2.7V to 3.6V Power Supply
Optimized Power Consumption down to 125mW with External Resistor
Low Power for Battery Operation
Two Serially Controlled 8-Bit D/A Converters
0.1mA 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