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AD7721AN

CMOS 16-Bit, 468.75 kHz, Sigma-Delta ADC

Analog Devices 

ABSOLUTE MAXIMUM RATINGS1

(TA = +25°C unless otherwise stated)

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

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

AVDD to DVDD . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V

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

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

Analog Input Voltage to AGND . . . . –0.3 V to AVDD + 0.3 V

Input Current to Any Pin Except Supplies2 . . . . . . . ± 10 mA

Operating Temperature Range

Industrial (A Version) . . . . . . . . . . . . . . . . . –40°C to +85°C

Extended (S Version) . . . . . . . . . . . . . . . . –55°C to +125°C

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

Maximum Junction Temperature . . . . . . . . . . . . . . . +150°C

Plastic Package

θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 74°C/W

AD7721

Lead Temperature, Soldering (10 sec) . . . . . . . . . . +260°C

Cerdip Package

θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 51°C/W

Lead Temperature, Soldering (10 sec) . . . . . . . . . . +300°C

SOIC Package

θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 72°C/W

Lead Temperature, Soldering

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

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

NOTES

1Stresses 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 listed in the operational

sections of this specification is not implied. Exposure to absolute maximum

rating conditions for extended periods may affect device reliability.

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

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 this device 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.

WARNING!

ESD SENSITIVE DEVICE

ORDERING GUIDE

Model

Temperature Range Package Option*

AD7721AN

AD7721AR

AD7721SQ

–40°C to +85°C

–40°C to +85°C

–55°C to +125°C

N-28

R-28

Q-28

*N = Plastic DIP; R = 0.3" Small Outline IC (SOIC); Q = Cerdip.

PIN CONFIGURATION

SCLK/DB7 1

28 DB6

DB8 2

27 RD

DB9 3

26 WR

RFS/DB10 4

25 DVAL/SYNC

SDATA/DB11 5 AD7721 24 AGND

DGND 6 TOP VIEW 23 VIN2

DSUBST 7 (Not to Scale) 22 VIN1

DGND 8

21 REFIN

STBY/DB0 9

20 AGND

DVDD 10

19 AVDD

CAL/DB1 11

UNI/DB2 12

DB3 13

DB4 14

18 CS

17 CLK

16 DRDY

15 SYNC/DB5

REV. A

–5–

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