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AD7171 Datasheet(PDF) 14 Page - Analog Devices

Part No. AD7171
Description  16-Bit, Low Power, Sigma-Delta ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7171 Datasheet(HTML) 14 Page - Analog Devices

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Data Sheet
AD7171
Rev. C | Page 13 of 16
APPLICATIONS INFORMATION
The AD7171 provides a low cost, high resolution analog-to-digital
function. Because the analog-to-digital function is provided
by a Σ-Δ architecture, the device is more immune to noisy
environments, making it ideal for use in sensor measurement
and industrial and process-control applications.
TEMPERATURE SYSTEM
Figure 13 shows the AD7171 used in a temperature measurement
system. The thermistor is connected in series with a precision
resistor, RREF, the precision resistor being used to generate the
reference voltage. The value of RREF is equal to the maximum
resistance produced by the thermistor. The complete dynamic
range of the ADC is then used, resulting in optimum performance.
See Table 8 for suitable external RC combinations.
16-BIT Σ-Δ
ADC
AD7171
GND
VDD
INTERNAL
CLOCK
VDD
RREF
REFIN(+)
AIN(+)
AIN(–)
REFIN(–)
SCLK
DOUT/RDY
PDRST
Figure 13. Temperature System Using the AD7171
SIGNAL CONDITIONING CIRCUIT
Figure 14 shows the AD7171 used in a signal conditioning
circuit for a single-ended analog input. In a low side shunt
current monitor, a low resistance shunt resistor converts the
current to voltage. The resulting voltage is amplified and
applied to the AD7171.
AD7171
REFIN(+)
AIN(+)
AIN(–)
REFIN(–)
GND VDD
INTERNAL
CLOCK
SCLK
DOUT/RDY
ADR5041
AD8628
1µF
ANALOG
INPUT
1k
Ω
32k
Ω
16-BIT
Σ-Δ ADC
Figure 14. Signal Conditioning Circuit


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