Block Diagram of XRD9827REF

... the analog plusTM compa

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

PRELIMINARY

CANON CVA-60216K 600DPI COLOR CIS

CIS OUTPUT

CIS REFERENCE

VOLTAGE

FIFO

SRAM

XRD9827	6-BIT BUS NIBBLE

FIFO

SRAM

XRD9827 CONTROL SIGNALS

8-BIT DATA

PARALLEL

PORT DB25

CONNECTOR

8-BIT DATA

DATA

INTEL 486 Compatible

MACH435 CPLD

PARALLEL PORT CONTROL

CIS CONTROL SIGNALS

Figure 1. Block Diagram of XRD9827REF

The XRD9827 is a complete linear CIS or CCD sensor signal processor on a single monolithic chip. The XRD9827 includes a high speed 12-Bit ADC, a 6-Bit Programmable Gain Amplifier with gain adjustment of 1 to 10 and an 8-Bit programmable input referred offset calibration range of 800 mV. The XRD9827 also provides the necessary biasing voltage for the CANON CIS, eliminating the use of external components (two diodes and two resistors). See the XRD9827EVAL User Manual / PCB board for evaluating the XRD9827 CIS / CCD signal processor chip. A simplified functional block diagram of XRD9827 is shown below for your reference.