XRD9815 查看數據表（PDF） - Exar Corporation

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XRD9815

3-Channel 12-Bit Linear CCD & CIS Sensor Signal Processors

Exar Corporation 

FEATURES

D 12--Bit, 13.5 MSPS, A/D Converter

D Triple-Channel,4.5 MSPS CCD Color Scan Mode

D Single-Channel, 9 MSPS Mode

D Triple Correlated Double Sampler

D Triple Programmable Gain Amplifier

D Serial Programming Interface

D CDS for CCD or S/H Mode for CIS Imagers

D Inverting or Non-Inverting Mode

XRD9815

3-Channel 12-Bit Linear CCD & CIS

Sensor Signal Processors

D Internal Voltage Reference

May 2000-1

D 5V Operation and 3V I/O Compatibility

D Low Power CMOS: 500mW @ 5V

D 32-Pin TQFP Surface Mount Package

APPLICATIONS

D CCD or CIS Color Scanners

D Multifunction Products

D Image Scanners

D Film Scanners

GENERAL DESCRIPTION

The XRD9815 is a fully integrated, high-performance

analog signal processor/digitizer specifically designed for

use in high speed, 3-channel linear CCD and CIS imaging

applications.

Each channel of the XRD9815 includes a Correlated

Double Sampler (CDS), Programmable Gain Amplifier

(PGA) and channel offset adjustment. After gain and

offset adjustment, the analog inputs are sequentially

sampled and digitized by an accurate A/D converter. The

analog front-end can be configured for inverting/

non-inverting input, CDS or sample-hold (S/H) mode, or

AC/DC coupling, making the XRD9815 ideal for use in

CCD, CIS and other data acquisition applications. The

CDS mode of operation supports both line and

pixel-clamp modes and can be used to achieve significant

reduction in system 1/f noise and CCD reset clock

feed-through.

PGA gain and channel offsets can be updated on a line by

line basis. Each channel can have a separate offset and

gain setting.

The differential inputs reject common mode noise that

can accumulate in a scanner system due to lamp

switching and cabling.

In S/H mode the internal DC-restore voltage clamp can be

enabled or disabled to support AC-coupled or DC inputs.

Sampling mode, PGA gain, channel offset and input

signal polarity are all programmable through a serial

interface. PGA gain (1-9.2) and channel offset (-210mV

to 250mVmin) are programmable in 256 linear steps. The

A/D Full-Scale Range (FSR) is programmable to 2V or 3V.

ORDERING INFORMATION

Part No.

XRD9815ACQ

Package

32-Lead TQFP

Operating

Temperature Range

0°C to +70°C

Rev. 5.10

E2000

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017 z www.exar.com

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