AD7731 datasheet(1/44 Pages) AD

Il numero della parte	AD7731

Spiegazioni elettronici	Low Noise, High Throughput 24-Bit Sigma-Delta ADC

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reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

AD7731

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

World Wide Web Site: http://www.analog.com

Fax: 617/326-8703

Low Noise, High Throughput

24-Bit Sigma-Delta ADC

FUNCTIONAL BLOCK DIAGRAM

SIGMA-

DELTA

MODULATOR

AD7731

SERIAL INTERFACE

AND CONTROL LOGIC

CLOCK

GENERATION

PROGRAMMABLE

DIGITAL

FILTER

SIGMA-DELTA A/D CONVERTER

BUFFER

PGA

100nA

AGND

100nA

AVDD

NC

AIN1

AIN2

AIN3

AIN4

STANDBY

SYNC

MCLK IN

MCLK OUT

SCLK

CS

DIN

DOUT

RESET

RDY

POL

DGND

AGND

AVDD

DVDD

REF IN(–)

REF IN(+)

MUX

AIN5

AIN6

REGISTER BANK

CALIBRATION

MICROCONTROLLER

GENERAL DESCRIPTION

The AD7731 is a complete analog front-end for process control

applications. The device has a proprietary programmable gain

front end that allows it to accept a range of input signal ranges,

including low level signals, directly from a transducer. The sigma-

delta architecture of the part consists of an analog modulator

and a low pass programmable digital filter, allowing adjustment

of filter cutoff, output rate and settling time.

The part features three buffered differential programmable gain

analog inputs (which can be configured as five pseudo-differential

inputs), as well as a differential reference input. The part oper-

ates from a single +5 V supply and accepts seven unipolar ana-

log input ranges: 0 to +20 mV, +40 mV, +80 mV, +160 mV,

+320 mV, +640 mV and +1.28 V, and seven bipolar ranges:

±20 mV, ±40 mV, ±80 mV, ±160 mV, ±320 mV, ±640 mV and

±1.28 V. The peak-to-peak resolution achievable directly from

the part is 16 bits at an 800 Hz output rate. The part can switch

between channels with 1 ms settling time and maintain a perfor-

mance level of 13 bits of peak-to-peak resolution.

The serial interface on the part can be configured for three-wire

operation and is compatible with microcontrollers and digital

signal processors. The AD7731 contains self-calibration and

system calibration options and features an offset drift of less

than 5 nV/

°C and a gain drift of less than 2 ppm/°C.

The part is available in a 24-lead plastic DIP, a 24-lead SOIC

and 24-lead TSSOP package.

FEATURES

24-Bit Sigma-Delta ADC

16 Bits p-p Resolution at 800 Hz Output Rate

Programmable Output Rates up to 6.4 kHz

Programmable Gain Front End

0.0015% Nonlinearity

Buffered Differential Inputs

Programmable Filter Cutoffs

FASTStep™* Mode for Channel Sequencing

Single Supply Operation

APPLICATIONS

Process Control

PLCs/DCS

Industrial Instrumentation

*FASTStep is a trademark of Analog Devices, Inc.

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