16-Bit, Low Power, Sigma-Delta ADC
Output data rate: 125 Hz
Pin-programmable power-down and reset
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
2-wire serial (read-only device)
Schmitt trigger on SCLK
Industrial process control
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
FUNCTIONAL BLOCK DIAGRAM
VREF = VDD
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
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.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
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