AD7732

Rev. 0 | Page 31 of 32

+

10

µF

0.1

µF

+

10

µF

0.1

µF

ANALOG

INPUTS

R=15.5k

Ω

R

CLOCK

GENERATOR

MCLKIN

MCLKOUT

33pF

33pF

6.144MHz

AIN0(+)

BIAS0(+)

RA

RB

BIAS0(–)

RC

RD

±10V

DIFFERENTIAL

VOLTAGE

±10V

DIFFERENTIAL

VOLTAGE

(MAX ±16.5V

ABSOLUTE

VOLTAGE

TO AGND)

±11.5V COMMON-

MODE VOLTAGE

7R=108.5k

Ω

MUX

R

7R

7R

24-BIT

Σ-∆ ADC

BUFFER

DVDD

AIN0(–)

AIN1(+)

BIAS1(+)

REFIN(–)

REFIN(+)

AGND

10

µF

+

0.01

µF

+

10

µF

AD780

VOUT

+VIN

TEMP

+2.5V

AD7732

R

7R

SERIAL

INTERFACE

AND

CONTROL

LOGIC

SCLK

DIN

DOUT

CS

RDY

RESET

DGND

HOST

SYSTEM

AIN1(–)

BIAS1(–)

Figure 29. Typical Connections for the AD7732 Application

High Common-Mode Voltage Application

Using additional thin film resistors on AIN0 and an external operational amplifier with a ±15 V power supply, the AD7732 AIN0 can

easily be configured to accept high common-mode voltages.

+15V

–15V

+

10

µF

0.1

µF

+

10

µF

0.1

µF

ANALOG

INPUTS

R=15.5k

Ω

2R

2R

2R

2R

CLOCK

GENERATOR

MCLKIN

MCLKOUT

33pF

33pF

6.144MHz

AIN0(+)

BIAS0(+)

RA

RB

BIAS0(–)

RC

RD

±10V

DIFFERENTIAL

VOLTAGE

(±42V ABSOLUTE

MAX VOLTAGE

TO AGND)

±37V COMMON-

MODE VOLTAGE

7R=108.5k

Ω

MUX

7R

24-BIT

Σ-∆ ADC

BUFFER

DVDD

AIN0(–)

REFIN(–)

REFIN(+)

AGND

10

µF

+

0.01

µF

+

10

µF

AD780

VOUT

+VIN

TEMP

+2.5V

AD7732

SERIAL

INTERFACE

AND

CONTROL

LOGIC

SCLK

DIN

DOUT

CS

RDY

RESET

DGND

HOST

SYSTEM

Figure 30. High Common-Mode Voltage Application