AD7719 datasheet(1/40 Pages) AD

Part #	AD7719

Description	Low Voltage, Low Power, Factory-Calibrated 16-/24-Bit Dual ADC

PDF	40 Pages

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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1 / 40 page

REV. 0

a

AD7719

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

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

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 that

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

under any patent or patent rights of Analog Devices.

Low Voltage, Low Power,

Factory-Calibrated 16-/24-Bit Dual - ADC

FEATURES

HIGH RESOLUTION

-

ADCs

Two Independent ADCs (16- and 24-Bit Resolution)

Factory-Calibrated (Field Calibration Not Required)

Output Settles in One Conversion Cycle (Single

Conversion Mode)

Programmable Gain Front End

Simultaneous Sampling and Conversion of Two

Signal Sources

Separate Reference Inputs for Each Channel

Simultaneous 50 Hz and 60 Hz Rejection at 20 Hz

Update Rate

ISOURCE SelectTM

24-Bit No Missing Codes—Main ADC

13-Bit p-p Resolution @ 20 Hz, 20 mV Range

18-Bit p-p Resolution @ 20 Hz, 2.56 V Range

INTERFACE

3-Wire Serial

SPITM, QSPITM, MICROWIRETM and DSP-Compatible

Schmitt Trigger on SCLK

POWER

Specified for Single 3 V and 5 V Operation

Normal: 1.5 mA Typ @ 3 V

Power-Down: 10

A (32 kHz Crystal Running)

ON-CHIP FUNCTIONS

Rail-Rail Input Buffer and PGA

4-Bit Digital I/O Port

On-Chip Temperature Sensor

Dual Switchable Excitation Current Sources

GENERAL DESCRIPTION

The AD7719 is a complete analog front end for low frequency

measurement applications. It contains two high resolution sigma-

delta ADCs, switchable matched excitation current sources,

low-side power switches, digital I/O port, and temperature

sensor. The 24-bit main channel with PGA accepts fully differen-

tial, unipolar, and bipolar input signal ranges from 1.024

×

REFIN1/128 to 1.024

× REFIN1. Signals can be converted

directly from a transducer without the need for signal condi-

tioning. The 16-bit auxiliary channel has an input signal range

of REFIN2 or REFIN2/2.

The device operates from a 32 kHz crystal with an on-chip

PLL generating the required internal operating frequency. The

output data rate from the part is software programmable. The

peak-to-peak resolution from the part varies with the programmed

gain and output data rate.

The part operates from a single 3 V or 5 V supply. When oper-

ating from 3 V supplies, the power dissipation for the part is

4.5 mW with both ADCs enabled and 2.85 mW with only the

main ADC enabled in unbuffered mode. The AD7719 is housed

in 28-lead SOIC and TSSOP packages.

Low-Side Power Switches

Reference Detect Circuit

APPLICATIONS

Sensor Measurement

Temperature Measurement

Pressure Measurements

Weigh Scales

Portable Instrumentation

4–20 mA Transmitters

ISOURCE Select is a trademark of Analog Devices.

SPI and QSPI are trademarks of Motorola Inc.

MICROWIRE is a trademark of National Semiconductor Corporation.

FUNCTIONAL BLOCK DIAGRAM

MUX

AVDD

IEXC1

200 A

IEXC2

200 A

AVDD

AGND

BUF

PGA

MUX1

TEMP

SENSOR

I/O PORT

AVDD

MAIN CHANNEL

24-BIT

-

ADC

AUXILIARY CHANNEL

16-BIT

-

ADC

REFERENCE

DETECT

OSC. AND

PLL

SERIAL

INTERFACE

AND

CONTROL

LOGIC

DVDD

DGND

IOUT1

IOUT2

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

AVDD

AGND

REFIN2

PWRGND

P1/SW1 P2/SW2 P3

P4

DOUT

DIN

SCLK

CS

RDY

RESET

XTAL1

XTAL2

REFIN1(+)

REFIN1(–)

AD7719

MUX2

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