AD7171 데이터 시트보기 (PDF) - Analog Devices

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AD7171

16-Bit, Low Power, Sigma-Delta ADC

Analog Devices 

Data Sheet

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.

VDD

RREF

AIN(+)

GND VDD

AIN(–)

16-BIT Σ-Δ

ADC

AD7171

REFIN(+)

REFIN(–)

INTERNAL

CLOCK

DOUT/RDY

SCLK

PDRST

Figure 13. Temperature System Using the AD7171

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.

32kΩ

1kΩ

ANALOG

INPUT

ADR5041

AD8628

1µF

AIN(+)

AIN(–)

GND VDD

16-BIT

Σ-Δ ADC

REFIN(+)

REFIN(–)

INTERNAL

CLOCK

AD7171

DOUT/RDY

SCLK

Figure 14. Signal Conditioning Circuit

Rev. C | Page 13 of 16

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