AD7714 Analog Devices, AD7714 Datasheet - Page 37

• Manufacturer Part Number: AD7714
• Manufacturer: Analog Devices

Specifications of AD7714

• Resolution (bits): 24bit
• # Chan: 5
• Sample Rate: 19.2kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: (2Vref/PGA Gain) p-p,Uni (Vref)/(PGA Gain)
• Adc Architecture: Sigma-Delta
• Pkg Type: DIP,SOIC,SOP

Data Acquisition
The AD7714 with its three differential channels (or five pseudo-
differential channels) is suited to low bandwidth, high resolution
data acquisition systems. In addition, the three-wire digital
interface allows this data acquisition front end to be isolated
with just three optoisolators. The entire system can be operated
REV. C
IN1+
IN1–
IN2+
IN2–
IN3+
IN3–
+V
AD780
IN
GND
+5V
V
OUT
Figure 15. Data Acquisition System Using the AD7714
REF IN (+)
REF IN (–)
AGND
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AGND
AV
+5V
AV
DD
DGND
1 A
DD
1 A
BUFFER
DV
DD
BUFFER
DV
SERIAL INTERFACE
DD
A = 1–128
–37–
PGA
from a single +3 V or +5 V supply provided that the input sig-
nals to the AD7714’s analog inputs are all of positive polarity.
The low power operation of the AD7714 ensures that very little
power has to be brought across the isolation barrier. Figure 15
shows the AD7714 in an isolated data acquisition system.
DOUT
MICROCONTROLLER
REGISTER BANK
AUTO-ZEROED
CHARGE BALANCING A/D
MODULATOR
DIN
CONVERTER
CS
GENERATION
AD7714
CLOCK
DIGITAL
FILTER
SCLK
OPTO-ISOLATORS
MCLK IN
MCLK OUT
STANDBY
SYNC
RESET
DRDY
POL
AD7714
2