AD7712 datasheet(4/28 Pages) AD

4 / 28 page

Parameter

A, S Versions1

Units

Conditions/Comments

POWER REQUIREMENTS

Power Supply Voltages

AVDD Voltage

+5 to +10

V nom

±5% for Specified Performance

DVDD Voltage

V nom

±5% for Specified Performance

AVDD – VSS Voltage

+10.5

V max

For Specified Performance

Power Supply Currents

AVDD Current

mA max

DVDD Current

4.5

mA max

VSS Current

1.5

mA max

VSS = –5 V

Power Supply Rejection20

Rejection w.r.t. AGND; Assumes VBIAS Is Fixed

Positive Supply (AVDD and DVDD)

See Note 21

dB typ

Negative Supply (VSS)

dB typ

Power Dissipation

Normal Mode

mW max

AVDD = DVDD = +5 V, VSS = 0 V; Typically 25 mW

Normal Mode

52.5

mW max

AVDD = DVDD = +5 V, VSS = –5 V; Typically 30 mW

Standby (Power-Down) Mode22

200

µW max

AVDD = DVDD = +5 V, VSS = 0 V or –5 V; Typically 100 µW

NOTES

18The AD7712 is specified with a 10 MHz clock for AV

DD voltages of +5 V ± 5%. It is specified with an 8 MHz clock for AV DD voltages greater than 5.25 V and less

than 10.5 V.

19The

±5% tolerance on the DV

DD input is allowed provided that DVDD does not exceed AVDD by more than 0.3 V.

20Measured at dc and applies in the selected passband. PSRR at 50 Hz will exceed 120 dB with filter notches of 10 Hz, 25 Hz or 50 Hz. PSRR at 60 Hz will

exceed 120 dB with filter notches of 10 Hz, 30 Hz or 60 Hz.

21PSRR depends on gain: gain of 1 = 70 dB typ; gain of 2 = 75 dB typ; gain of 4 = 80 dB typ; gains of 8 to 128 = 85 dB typ. These numbers can be improved

(to 95 dB typ) by deriving the VBIAS voltage (via Zener diode or reference) from the AVDD supply.

22Using the hardware STANDBY pin. Standby power dissipation using the software standby bit (PD) of the Control Register is 8 mW typ.

Specifications subject to change without notice.

AD7712–SPECIFICATIONS

REV. E

–4–

CAUTION

ESD (electrostatic discharge) sensitive device. The digital control inputs are diode protected;

however, permanent damage may occur on unconnected devices subject to high energy electro-

static fields. Unused devices must be stored in conductive foam or shunts. The protective foam

should be discharged to the destination socket before devices are inserted.

REF OUT to AGND . . . . . . . . . . . . . . . . . . . . –0.3 V to AVDD

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

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

Operating Temperature Range

Commercial (A Version) . . . . . . . . . . . . . . . –40

°C to +85°C

Extended (S Version) . . . . . . . . . . . . . . . . . –55

°C to +125°C

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

°C to +150°C

Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . . +300

°C

Power Dissipation (Any Package) to +75

°C . . . . . . . . 450 mW

*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 listed in the operational

sections of the specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

ABSOLUTE MAXIMUM RATINGS*

(TA = +25°C, unless otherwise noted)

AVDD to DVDD . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +12 V

AVDD to VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +12 V

AVDD to AGND . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +12 V

AVDD to DGND . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +12 V

DVDD to AGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V

DVDD to DGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V

VSS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –6 V

VSS to DGND . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –6 V

AIN1 Input Voltage to AGND . . VSS – 0.3 V to AVDD + 0.3 V

Reference Input Voltage to AGND

. . . . . . . . . . . . . . . . . . . . . . . . . VSS – 0.3 V to AVDD + 0.3 V

ORDERING GUIDE

Model

Temperature Range

Package Options*

AD7712AN

–40

°C to +85°C

N-24

AD7712AR

–40

°C to +85°C

R-24

AD7712AQ

–40

°C to +85°CQ-24

AD7712SQ

–55

°C to +125°CQ-24

EVAL-AD7712EB Evaluation Board

*N = Plastic DIP, Q = Cerdip; R = SOIC.

WARNING!

ESD SENSITIVE DEVICE

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