Texas Instruments ADS7862 Handleiding

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

Simultaneous Sampling

ANALOG-TO-DIGITAL CONVERTER

FEATURES

●4 INPUT CHANNELS

●FULLY DIFFERENTIAL INPUTS

●2µs TOTAL THROUGHPUT PER CHANNEL

●GUARANTEED NO MISSING CODES

●PARALLEL INTERFACE

●1MHz EFFECTIVE SAMPLING RATE

●LOW POWER: 40mW

APPLICATIONS

●MOTOR CONTROL

●MULTI-AXIS POSITIONING SYSTEMS

●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 simultaneous signal acquisition.

Inputs to the sample-and-hold amplifiers are fully differential

and are maintained differential to the input of the A/D con-

verter. This provides excellent common-mode rejection of

80dB at 50kHz, which is important in high noise environ-

ments.

The ADS7862 offers parallel interface and control inputs 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 fully specified over the –40°C to

+85°C operating range.

ADS7862

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

ADS7862

®

SBAS101B – JANUARY 1998 – REVISED AUGUST 2005

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 © 1998-2005, 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.

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Product specificaties