AD7732 Analog Devices, AD7732 Datasheet - Page 31

• Manufacturer Part Number: AD7732
• Manufacturer: Analog Devices

Specifications of AD7732

• Resolution (bits): 24bit
• # Chan: 2
• Sample Rate: 3.05MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: Bip 10V,Bip 5.0V,Uni 10V,Uni 5.0V
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

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.
±37V COMMON-
MODE VOLTAGE
(±42V ABSOLUTE
MAX VOLTAGE
TO AGND)
±11.5V COMMON-
MODE VOLTAGE
AV
AV
+
+
(MAX ±16.5V
ABSOLUTE
VOLTAGE
TO AGND)
DD
DD
10μF
10μF
TEMP
TEMP
+VIN
+VIN
0.01μF
0.01μF
ANALOG
INPUTS
ANALOG
INPUTS
±10V
DIFFERENTIAL
VOLTAGE
±10V
DIFFERENTIAL
VOLTAGE
±10V
DIFFERENTIAL
VOLTAGE
AD780
AD780
VOUT
VOUT
AV
AV
+
+
+
+
DD
DD
+2.5V
+2.5V
10μF
10μF
10μF
10μF
+15V
–15V
Figure 29. Typical Connections for the AD7732 Application
Figure 30. High Common-Mode Voltage Application
REFIN(+)
REFIN(+)
REFIN(–)
BIAS0(+)
REFIN(–)
BIAS0(+)
BIAS0(–)
BIAS1(+)
BIAS1(–)
BIAS0(–)
AIN0(+)
AIN1(+)
AIN0(+)
AIN0(–)
AIN0(–)
AIN1(–)
0.1μF
0.1μF
RA
RB
RC
RD
RA
RB
RC
RD
7R=108.5kΩ
R=15.5kΩ
R=15.5kΩ
7R=108.5kΩ
2R
2R
2R
2R
7R
7R
7R
7R
R
R
R
Rev. A | Page 31 of 32
MUX
MUX
AGND
AGND
AV
AV
DD
DD
AD7732
AD7732
BUFFER
BUFFER
GENERATOR
GENERATOR
INTERFACE
INTERFACE
CONTROL
CONTROL
CLOCK
SERIAL
Σ-Δ ADC
SERIAL
CLOCK
Σ-Δ ADC
LOGIC
LOGIC
24-BIT
24-BIT
AND
AND
DV
DV
DGND
DGND
DD
DD
MCLKOUT
MCLKOUT
MCLKIN
RESET
SCLK
DIN
DOUT
RDY
CS
MCLKIN
RESET
SCLK
DIN
DOUT
RDY
CS
0.1μF
0.1μF
33pF
33pF
DV DD
DV DD
6.144MHz
6.144MHz
HOST
SYSTEM
HOST
SYSTEM
DV
DV
+
+
DD
DD
10μF
33pF
10μF
33pF
AD7732