Datasheet
AD7732
Rev. A | Page 31 of 32
+
10
μ
F 0.1
μ
F
+
10
μ
F0.1
μ
F
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
-
Δ
ADC
BUFFER
DV
DD
AIN0(–)
AIN1(+)
BIAS1(+)
REFIN(–)
REFIN(+)
AGND
10
μ
F
+
0.01
μ
F
+
10
μ
F
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(–)
AV
DD
AV
DD
DV
DD
DV
DD
AV
DD
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
+
10μF 0.1μF
+
10μF0.1μF
ANALOG
INPUTS
R=15.5kΩ
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 VOLTAG
E
TO AGND)
±37V COMMON-
MODE VOLTAGE
7R=108.5kΩ
MUX
7R
24-BIT
Σ-Δ ADC
BUFFER
DV
DD
AIN0(–)
REFIN(–)
REFIN(+)
AGND
10μF
+
0.01μF
+
10μF
AD780
VOUT+VIN
TEMP
+2.5V
AD7732
SERIAL
INTERFACE
AND
CONTROL
LOGIC
SCLK
DIN
DOUT
CS
RDY
RESET
DGND
HOST
SYSTEM
AV
DD
AV
DD
DV
DD
DV
DD
AV
DD
Figure 30. High Common-Mode Voltage Application