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AD7171

16-Bit, Low Power, Sigma-Delta ADC

Analog Devices 

Data Sheet

16-Bit, Low Power, Sigma-Delta ADC

AD7171

FEATURES

Output data rate: 125 Hz

Pin-programmable power-down and reset

Status function

Internal clock oscillator

Current: 135 µA

Power supply: 2.7 V to 5.25 V

−40°C to +105°C temperature range

Package: 10-lead 3 mm × 3 mm LFCSP

INTERFACE

2-wire serial (read-only device)

SPI compatible

Schmitt trigger on SCLK

APPLICATIONS

Weigh scales

Pressure measurement

Industrial process control

Portable instrumentation

GENERAL DESCRIPTION

The AD7171 is a very low power, 16-bit, analog-to-digital

converter (ADC). It contains a precision, 16-bit, Σ-Δ ADC and

an on-chip oscillator. Consuming only 135 µA, the AD7171 is

particularly suitable for portable or battery operated products

where very low power is a requirement. The AD7171 also has a

power-down mode in which the device consumes 5 μA, thus

increasing the battery life of the product.

For ease of use, dedicated pins control all of the features of the

AD7171. Each time a data read occurs, eight status bits are

appended to the 16-bit conversion. These status bits contain a

pattern sequence that can be used to confirm the validity of the

serial transfer.

FUNCTIONAL BLOCK DIAGRAM

GND VDD

REFIN(+) REFIN(–)

AIN(+)

AIN(–)

AD7171

16-BIT Σ-Δ

ADC

INTERNAL

CLOCK

DOUT/RDY

SCLK

PDRST

Table 1.

VREF = VDD

5V

3V

RMS Noise

11.5 µV

6.9 µV

Figure 1.

P-P Noise

76 µV

45 µV

P-P Resolution

16 bits

16 bits

ENOB

16 bits

16 bits

The output data rate of the AD7171 is 125 Hz, whereas the settling

time is 24 ms. The AD7171 has one differential input and a gain

of 1. This is useful in applications where the user needs to use an

external amplifier to implement system-specific filtering or gain

requirements.

The AD7171 operates with a power supply from 2.7 V to 5.25 V.

It is available in a 10-lead LFCSP.

The AD7170 is a 12-bit version of the AD7171. It has the same

feature set as the AD7171 and is pin-for-pin compatible.

Rev. C

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