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AD7171 Datasheet(PDF) 1 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) 1 Page - Analog Devices

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16-Bit, Low Power, Sigma-Delta ADC
Data Sheet
AD7171
Rev. C
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2009–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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
FUNCTIONAL BLOCK DIAGRAM
16-BIT Σ-Δ
ADC
AD7171
GND
INTERNAL
CLOCK
VDD
REFIN(+)
AIN(+)
AIN(–)
REFIN(–)
DOUT/RDY
SCLK
PDRST
Figure 1.
Table 1.
VREF = VDD
RMS Noise
P-P Noise
P-P Resolution
ENOB
5 V
11.5 µV
76 µV
16 bits
16 bits
3 V
6.9 µV
45 µV
16 bits
16 bits
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.
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.


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