GENERAL DESCRIPTION

The W6662 is a highly integrated CCD/CIS analog front end signal processor. It provides the components required for all necessary front-end signal process of a CCD/CIS scanner, including a 3-channel input clamp circuit for correlated double sampling (short as CDS) mode, a multiplexer to mux 3-channel inputs to a correlated double sampling (CDS) circuit, a programmable offset adjusted and gain controlled amplifier, a 12-bit analog-to-digital converter. CDS or S&H (sample and hold) of operation modes can be chosen. The device configuration is programmed via 3-wire or 4-wired interface, operation modes, offset and gain value of each channel can be programmed.

FEATURES

· 12-bit A/D Converter

· No Missing Code Guaranteed

· Three channels analog input with clamp circuit individually

· Integrated Correlated Double Sampler (CDS)

· Supports Contact Image Sensors (CIS)

· Accept CCD/CIS sensor with three channel or single channel analog out

· External offset voltage input for CIS reference voltage

· Built-in bandgap reference circuit for CDS mode and A/D Converter

· Integrated 6-bit Programmable Gain Amplifier (PGA) with 3-channel register selected

· Integrated 8-bit offset adjustment with 3-channel register selected

· 3 MHz sampling rate of offset/gain adjustment circuit

· Three-wired or four-wired Serial Interface programmable

· Registers readback capability

· Low power CMOS device

· Power down mode supported

· 3/5V digital I/O pin

· Packageed in 48-pin QFP

Applications:

Flatbed Scanners

Sheetfeed Scanners

Film Scanners