Preliminary

... the analog plusTM compa

EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030

EVALUATION KIT PART LIST

This kit contains the following:

•XRD9827REF CIS 36-Bit Color Single Line Scanner

•XRD9827REF User Manual

•SenseIt 1.0 Software Installation Diskettes (2)

•XRD9827 Data Sheet

•Scan Targets (Black, White, Color)

FEATURES

•One line scanning functionality of XRD9827 with CANON 600DPI CIS (Contact Image Sensor)

•Easy to use with most personal computers through Parallel Port Interface

•Simple way of loading the Serial Port of XRD9827 to adjust gain and offset

•Software SenseIt 1.0 to view single line scan

•Optimized PCB Layout with Four Layer

SYSTEM REQUIREMENTS

•Intel 486 compatible computer with Windows 95 operating system

•8 MBytes system memory

•25-pin D-shape parallel port receptacles

•3 1/2” floppy disk drive

INTRODUCTION

The XRD9827REF is a demo system which includes a PCB design with a CANON CVA-60216K 600DPI Color Contact Image Sensor (CIS). It demonstrates how to interface a CIS with EXAR’s XRD9827, a 12- bit Linear CIS/CCD Sensor Signal Processor to output a single line scan and display the amplitude of each of the three colors. The XRD9827REF is designed to provide a signal path for the CIS output signals to be processed, digitized by the XRD9827 and transmitted to a personal computer. There are no software algorithms or hardware implementations, for example, gamma correction, to adjust for color response.

The XRD9827REF board is loaded with the XRD9827, a Vantis MACH435 CPLD, two FIFO SRAMs and peripheral circuits for the CIS. The MACH435, which is a CMOS Programmable Logic Device (CPLD) provides timing signals to the XRD9827, the SRAMs and the CIS. It also programs the XRD9827 to operate in the correct mode and adjust for gain and offset values. The XRD9827 processes the analog output from the CIS sensor, level-shifts and converts the signal into 12-bit digital codes. The SRAMs gate the digitized data from the XRD9827 and stores the data temporarily. Controlled by the software, the SRAMs send the data through a parallel port connection to the PC and histograms of raw data are displayed in the monitor using the SenseIt software. A block diagram of the XRD9827REF is shown below in Figure 1.