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W6662CF

SCANNER ANALOG FRONT END

Winbond 

Preliminary W6662CF

SCANNER ANALOG FRONT END

1. 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.

2. 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

Publication Release Date: December 1998

-1-

Revision A1

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