AD7725 datasheet(8/28 Pages) AD

8 / 28 page

REV. A

–8–

AD7725

ABSOLUTE MAXIMUM RATINGS

(TA = 25

°C, unless otherwise noted.)

DVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V

AVDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V

AVDD, AVDD1 to DVDD . . . . . . . . . . . . . . . . . . . . –1 V to +1 V

AGND, AGND1 to DGND . . . . . . . . . . . . . –0.3 V to +0.3 V

Digital Inputs to DGND . . . . . . . . . . –0.3 V to DVDD + 0.3 V

Digital Outputs to DGND . . . . . . . . . –0.3 V to DVDD + 0.3 V

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

REF1 to AGND . . . . . . . . . . . . . . . . . –0.3 V to AVDD + 0.3 V

REF2 to AGND . . . . . . . . . . . . . . . . . –0.3 V to AVDD + 0.3 V

REFIN to AGND . . . . . . . . . . . . . . . . –0.3 V to AVDD + 0.3 V

DGND, AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

±0.3 V

Input Current to Any Pin except Supplies

. . . . . . . . .

±10 mA

IDD (AIDD + DIDD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mA

Operating Temperature Range . . . . . . . . . . . . –40

°C to +85°C

Storage Temperature Range . . . . . . . . . . . . . –65

°C to +150°C

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

°C

JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . 58

°C/W

JC Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . . . 20

°C/W

Lead Temperature, Soldering

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

°C

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

°C

ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV

NOTES

1 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.

2 Transient currents of up to 100 mA will not cause SCR latch-up.

ORDERING GUIDE

Temperature

Package

Model

Range

Description

Option1

AD7725BS

–40

°C to +85°CMetric Quad S-44-2

Flatpack

AD7725BS-REEL –40

°C to +85°CMetric Quad S-44-2

Flatpack

EVAL-

Evaluation

AD7725CB

Board

EVAL-

Controller

CONTROL

Board

BRD2

NOTES

1S = Metric Quad Flat Package (MQFP).

2This board can be used as a standalone evaluation board or in conjunction with the

Evaluation Board Controller for evaluation/demonstration purposes. It is accom-

panied by software and technical documentation.

3Evaluation Board Controller. This board is a complete unit allowing a PC to

control and communicate with all Analog Devices boards ending in the CB

designator. To obtain the complete evaluation kit, the following needs to be

ordered: EVAL-AD7725CB, EVAL-CONTROL BRD2, and a 12 V ac transformer.

The Filter Wizard software can be downloaded from the Analog Devices website.

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

AD7725 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.

STATUS

INSTRUCTION

DB0 DB15

–

INT

RD/

t34

t33

t40

t36

t35

t38

t23

t37

t39

THREE-STATE

Figure 8. Parallel Mode (Reading the Status Register and Writing Instructions)

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