AD7731 Analog Devices, AD7731 Datasheet - Page 41

• Manufacturer Part Number: AD7731
• Description: Low Noise, High Throughput 24-Bit Sigma-Delta ADC
• Manufacturer: Analog Devices

Specifications of AD7731

• Resolution (bits): 24bit
• # Chan: 3
• Sample Rate: 5MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: (2Vref/PGA Gain) p-p,(Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: DIP,SOIC,SOP

REV. A
REV. 0
THERMOCOUPLE
JUNCTION
3k
+V
R2
AD780
IN
GND
+5V
R
R
R
R
RTD
L3
L1
L2
L4
V
OUT
6.25k
R
R
R1
C
400 A
REF IN (+)
REF IN (–)
Figure 23. Temperature Measurement Using the AD7731
C
DGND
REF IN (+)
REF IN (–)
AGND
AIN1
AIN2
Figure 24. RTD Measurement Using the AD7731
AGND
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AGND
AV
DD
AGND
AV
100nA
100nA
DD
+5V
DGND
AV
100nA
100nA
BUFFER
+5V
DD
AV
BUFFER
DD
AND CONTROL LOGIC
PGA
SERIAL INTERFACE
DV
–41–
AND CONTROL LOGIC
PGA
DOUT
SERIAL INTERFACE
DD
DV
DD
REGISTER BANK
MODULATOR
DIN
REGISTER BANK
SIGMA-
DELTA
MODULATOR
POL
SIGMA-DELTA A/D
AD7731
SIGMA-
CONVERTER
DELTA
SIGMA-DELTA A/D
AD7731
CONVERTER
CS
RDY
GENERATION
CLOCK
GENERATION
DIGITAL
FILTER
SCLK
CLOCK
DIGITAL
FILTER
RESET
MCLK IN
MCLK OUT
STANDBY
SYNC
POL
RESET
RDY
STANDBY
SYNC
MCLK IN
MCLK OUT
SCLK
CS
DIN
DOUT
AD7731