1

ADS7862

®

Dual 500kHz, 12-Bit, 2 + 2 Channel

Simultaneous Sampling

ANALOG-TO-DIGITAL CONVERTER

FEATURES

q 4 INPUT CHANNELS

q FULLY DIFFERENTIAL INPUTS

q 2

q GUARANTEED NO MISSING CODES

q PARALLEL INTERFACE

q 1MHz EFFECTIVE SAMPLING RATE

q LOW POWER: 40mW

APPLICATIONS

q MOTOR CONTROL

q MULTI-AXIS POSITIONING SYSTEMS

q 3-PHASE POWER CONTROL

DESCRIPTION

The ADS7862 is a dual 12-bit, 500kHz analog-to-

digital converter (A/D) with 4 fully differential input

channels grouped into two pairs for high speed simulta-

neous signal acquisition. Inputs to the sample-and-hold

amplifiers are fully differential and are maintained dif-

ferential to the input of the A/D converter. This provides

excellent common-mode rejection of 80dB at 50kHz

which is important in high noise environments.

The ADS7862 offers parallel interface and control in-

puts to minimize software overhead. The output data for

each channel is available as a 12-bit word. The ADS7862

is offered in an TQFP-32 package and is full specified

over the –40

°C to +85°C operating range.

®

ADS7862

© 1998 Burr-Brown Corporation

PDS-1475B

Printed in U.S.A. May, 2000

SAR

Interface

Conversion

and

Control

Output

Registers

COMP

CONVST

BUSY

RD

CS

Data Output

12

CLOCK

A0

CDAC

Internal

2.5V

Reference

S/H

Amp

S/H

Amp

CH A0–

CH A0+

REF

IN

CH A1–

CH A1+

SAR

COMP

CDAC

MUX

MUX

CH B0–

CH B0+

CH B1–

CH B1+

REF

OUT

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Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

ADS7862

¤

For most current data sheet and other product

information, visit www.burr-brown.com