AD7714ANZ5 Analog Devices, AD7714ANZ5 Datasheet

AD7714ANZ5

Manufacturer Part Number

AD7714ANZ5

Description

DIP24

Manufacturer

Analog Devices

Datasheet

1.AD7714ARSZ5.pdf (40 pages)

Specifications of AD7714ANZ5

Date_code

09+

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GENERAL DESCRIPTION†

The AD7714 is a complete analog front end for low-frequency

measurement applications. The device accepts low level signals

directly from a transducer and outputs a serial digital word. It

employs a sigma-delta conversion technique to realize up to 24

bits of no missing codes performance. The input signal is applied

to a proprietary programmable gain front end based around an

analog modulator. The modulator output is processed by an on-

chip digital filter. The first notch of this digital filter can be

programmed via the on-chip control register allowing adjust-

ment of the filter cutoff and settling time.

The part features three differential analog inputs (which can also

be configured as five pseudo-differential analog inputs) as well as a

differential reference input. It operates from a single supply (+3 V

or +5 V). The AD7714 thus performs all signal conditioning and

conversion for a system consisting of up to five channels.

The AD7714 is ideal for use in smart, microcontroller- or DSP-

based systems. It features a serial interface that can be configured

*Protected by U.S. Patent No. 5,134,401.

†See page 39 for data sheet index.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corporation.

REV. C

Information furnished by Analog Devices is believed to be accurate and

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.

FEATURES

Charge Balancing ADC

Five-Channel Programmable Gain Front End

Three-Wire Serial Interface

3 V (AD7714-3) or 5 V (AD7714-5) Operation

Low Noise (<150 nV rms)

Low Current (350

AD7714Y Grade:

Low-Pass Filter with Programmable Filter Cutoffs

Ability to Read/Write Calibration Coefficients

APPLICATIONS

Portable Industrial Instruments

Portable Weigh Scales

Loop-Powered Systems

Pressure Transducers

24 Bits No Missing Codes

0.0015% Nonlinearity

Gains from 1 to 128

Can Be Configured as Three Fully Differential

Inputs or Five Pseudo-Differential Inputs

SPI™, QSPI™, MICROWIRE™ and DSP Compatible

+2.7 V to 3.3 V or +4.75 V to +5.25 V Operation

0.0010% Linearity Error

–40 C to +105 C Temperature Range

Schmitt Trigger on SCLK and DIN

Low Current (226 A typ) with Power-Down (4 A typ)

Lower Power Dissipation than Standard AD7714

Available in 24-Lead TSSOP Package

A typ) with Power-Down (5 A typ)

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

Tel: 781/329-4700

Fax: 781/326-8703

for three-wire operation. Gain settings, signal polarity and channel

selection can be configured in software using the serial port. The

AD7714 provides self-calibration, system calibration and back-

ground calibration options and also allows the user to read and

write the on-chip calibration registers.

CMOS construction ensures very low power dissipation, and the

power-down mode reduces the standby power consumption to

15 W typ. The part is available in a 24-pin, 0.3 inch-wide, plastic

dual-in-line package (DIP); a 24-lead small outline (SOIC)

package, a 28-lead shrink small outline package (SSOP) and a

24-lead thin shrink small outline package (TSSOP).

PRODUCT HIGHLIGHTS

1. The AD7714Y offers the following features in addition to the

2. The AD7714 consumes less than 500 A (f

3. The programmable gain channels allow the AD7714 to ac-

4. The AD7714 is ideal for microcontroller or DSP processor

5. The part features excellent static performance specifications

MCLK OUT

MCLK IN

standard AD7714: wider temperature range, Schmitt trigger

on SCLK and DIN, operation down to 2.7 V, lower power

consumption, better linearity, and availability in 24-lead

TSSOP package.

or 1 mA (f

it ideal for use in loop-powered systems.

cept input signals directly from a strain gage or transducer

removing a considerable amount of signal conditioning.

applications with a three-wire serial interface reducing the num-

ber of interconnect lines and reducing the number of opto-

couplers required in isolated systems. The part contains

on-chip registers that allow control over filter cutoff, input gain,

channel selection, signal polarity and calibration modes.

with 24-bit no missing codes, 0.0015% accuracy and low

rms noise (140 nV). Endpoint errors and the effects of tem-

perature drift are eliminated by on-chip self-calibration,

which removes zero-scale and full-scale errors.

BUFFER

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

AGND

FUNCTIONAL BLOCK DIAGRAM

CLK IN

GENERATION

Signal Conditioning ADC

AD7714

1 A

CLOCK

3 V/5 V, CMOS, 500 A

= 2.5 MHz) in total supply current, making

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

BUFFER

DGND

REF IN(–)

A = 1–128

PGA

REF IN(+)

POL

SERIAL INTERFACE

A/D CONVERTER

DIGITAL FILTER

DRDY

MODULATOR

BALANCING

CHARGE

AD7714*

RESET

CLK IN

= 1 MHz)

STANDBY

SYNC

SCLK

DIN

DOUT

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