AD7170 datasheet(13/16 Pages) AD

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AD7170

Rev. 0 | Page 13 of 16

APPLICATIONS INFORMATION

The AD7170 provides a low cost, high resolution analog-to-

digital function. Because the analog-to-digital function is

provided by a Σ-Δ architecture, the part is more immune to

noisy environments, making it ideal for use in sensor measure-

ment and industrial and process-control applications.

TEMPERATURE SYSTEM

Figure 13 shows the AD7170 used in a temperature measure-

ment 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.

12-BIT Σ-Δ

ADC

AD7170

GND

VDD

INTERNAL

CLOCK

VDD

RREF

REFIN(+)

AIN(+)

AIN(–)

REFIN(–)

SCLK

DOUT/RDY

PDRST

Figure 13. Temperature System Using the AD7170

SIGNAL CONDITIONING CIRCUIT

Figure 14 shows the AD7170 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 AD7170.

AD7170

REFIN(+)

AIN(+)

AIN(–)

REFIN(–)

GND VDD

INTERNAL

CLOCK

SCLK

DOUT/RDY

AD5041

AD8631

1µF

ANALOG

INPUT

1kΩ

32kΩ

12-BIT

Σ-Δ ADC

Figure 14. Signal Conditioning Circuit

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