XRD8775 datasheet(1/15 Pages) EXAR

Part #	XRD8775

Description	CMOS 8-Bit High Speed Analog-to-Digital Converter

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Manufacturer	EXAR [Exar Corporation]

Direct Link	http://www.exar.com

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EXAR Corporation, 48720 Kato Road, Fremont, CA 94538

• (510) 668-7000 • FAX (510) 668-7017

Rev. 4.00

XRD8775

CMOS 8-Bit High Speed

Analog-to-Digital Converter

April 2002-4

FEATURES

· 8-Bit Resolution

· Up to 20MHz Sampling Rate

· Internal S/H Function

· Single Supply: 5V

· V

IN DC Range: 0V to VDD

· V

REF DC Range: 1V to VDD

· Low Power: 75mW typ. (excluding reference)

· Latch-Up Free

· ESD Protection: 2000V Minimum

· 3V Version: XRD87L75

· Small 20-Pin SOIC/SSOP Packages

APPLICATIONS

· Digital Color Copiers

· Cellular Telephones

· CCD-Based Systems

· Hardware Scanners

· Video Capture Boards

GENERAL DESCRIPTION

The XRD8775 is an 8-bit Analog-to-Digital Converter in

a small 20-pin SOIC/SSOP package. Designed using

an advanced 5V CMOS process, this part offers excel-

lent performance, low power consumption and latch-up

free operation.

This device uses a two-step flash architecture to

maintain low power consumption at high conversion

rates. The input circuitry of the XRD8775 includes an

on-chip S/H function and allows the user to digitize

analog input signals between AGND and AV

DD. Careful

design and chip layout have achieved a low analog input

capacitance. This reduces “kickback” and eases the

requirements of the buffer/amplifier used to drive the

XRD8775.

The designer can choose the internally generated

reference voltages by connecting V

RB to VRBS and VRT to

V

RTS , or provide external reference voltages to the VRB

and V

RT pins. The internal reference generates 0.6V at

V

RB and 2.6V at VRT. Providing external reference

voltages allows easy interface to any input signal range

between GND and V

DD. This also allows the system to

adjust these voltages to cancel zero scale and full

scale errors, or to change the input range as needed.

The device operates from a single +5V supply. Power

consumption is 75mW at F

S = 15MHz.

Specified for operation over the commercial / industrial

(-40 to +85°C) temperature range, the XRD8775 is

available in Surface Mount (SOIC), Shrink Small Out-

line (SSOP) and Plastic Dual-In-line (PDIP) Packages.

SIMPLIFIED BLOCK AND TIMING DIAGRAM

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