AD7738 datasheet(6/28 Pages) AD

6 / 28 page

REV. 0

–6–

AD7738

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection. Although the

AD7738 features proprietary ESD protection circuitry, permanent damage may occur on devices

subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended

to avoid performance degradation or loss of functionality.

ABSOLUTE MAXIMUM RATINGS

(TA = 25 C unless otherwise noted.)

AVDD to AGND, DVDD to DGND . . . . . . . . . –0.3 V to +7 V

AGND to DGND . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V

AVDD to DVDD . . . . . . . . . . . . . . . . . . . . . . . . . . –5 V to +5 V

AIN, AINCOM to AGND . . . . . . . . . –0.3 V to AVDD + 0.3 V

REFIN(+), REFIN(–) to AGND . . . . . –0.3 V to AVDD + 0.3 V

MUXOUT(+) to AGND . . . . . . . . . . . –0.3 V to AVDD + 0.3 V

MUXOUT(–) to AGND . . . . . . . . . . . –0.3 V to AVDD + 0.3 V

ADCIN(+), ADCIN(–) to AGND . . . . –0.3 V to AVDD + 0.3 V

P1 Voltage to AGND . . . . . . . . . . . . . . –0.3 V to AVDD + 0.3 V

Digital Input Voltage to DGND . . . . . –0.3 V to AVDD + 0.3 V

Digital Output Voltage to DGND . . . . –0.3 V to AVDD + 0.3 V

Operating Temperature Range . . . . . . . . . . –40 C to +105 C

Storage Temperature Range . . . . . . . . . . . . –65 C to +150 C

Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150 C

TSSOP Package, Power Dissipation . . . . . . . . . . . . . 660 mW

JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . .

97.9 C/W

Lead Temperature, Soldering

Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215 C

Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the

device at these or any other conditions above those indicated in the operational

section of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

SCLK

DIN

DOUT

RDY

RESET

SERIAL

INTERFACE

CONTROL

LOGIC

AIN4

AIN5

AIN6

AIN7

MUX

AINCOM/P0

AIN0

AIN1

AIN2

AIN3

DGND

DVDD

REFERENCE

DETECT

REFIN– REFIN+

I/O PORT

SYNC/P1

CLOCK

GENERATOR

MCLKIN

MCLKOUT

MUXOUT ADCIN

AGND

AVDD

24-BIT

ADC

BUFFER

AD7738

CALIBRATION

CIRCUITRY

DVDD

AVDD

Figure 4. Block Diagram

ORDERING GUIDE

Temperature

Package

Model

Range

Description

Options

AD7738BRU

–40 C to +105 CTSSOP 28

RU-28

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