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

Simultaneous Sampling

ANALOG-TO-DIGITAL CONVERTER

FEATURES

q 4 INPUT CHANNELS

q FULLY DIFFERENTIAL INPUTS

q 2

q NO MISSING CODES

q 1MHz EFFECTIVE SAMPLING RATE

q LOW POWER: 40mW

q SSI SERIAL INTERFACE

q OPERATING TEMPERATURE RANGE:

–40

APPLICATIONS

q MOTOR CONTROL

q MULTI-AXIS POSITIONING SYSTEMS

q 3-PHASE POWER CONTROL

DESCRIPTION

The ADS7861 is a dual, 12-bit, 500kSPS, Analog-to-Digital

(A/D) converter with four fully differential input channels

grouped into two pairs for high speed, simultaneous signal

acquisition. Inputs to the sample-and-hold amplifiers are fully

differential and are maintained differential to the input of the

A/D converter. This provides excellent common-mode rejec-

tion of 80dB at 50kHz which is important in high noise

environments.

The ADS7861 offers a high-speed, dual serial interface and

control inputs to minimize software overhead. The output data

for each channel is available as a 12-bit word. The ADS7861

is offered in both an SSOP-24 and a QFN-32 package and is

fully specified over the –40

°C to +125°C operating range.

SAR

Serial

Interface

COMP

CLOCK

A0

M1

M0

CONVST

CS

RD

BUSY

SERIAL DATA B

SERIAL DATA A

CDAC

Internal

2.5V

Reference

SHA

CH A0–

CH A0+

REF

IN

CH A1–

CH A1+

SAR

COMP

CDAC

SHA

CH B0–

CH B0+

CH B1–

CH B1+

REF

OUT

ADS7861

SBAS110D – DECEMBER 1998 – REVISED AUGUST 2007

www.ti.com

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright © 1998-2007, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

ADS7

861

ADS

7861

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