16-Bit, Low Power, Sigma-Delta ADC
Data Sheet
AD7171
Rev. C Document Feedback
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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
V
DD
REFIN(+)
AIN(+)
AIN(–)
REFIN(–)
DOUT/RDY
SCLK
PDRST
08417-001
Figure 1.
Table 1.
V
REF
= V
DD
RMS Noise
P-P Noise
ENOB
5 V 11.5 µV 76 µV 16 bits 16 bits
3 V
6.9 µV
45 µV
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.
AD7171* PRODUCT PAGE QUICK LINKS
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EVALUATION KITS
AD7171 Evaluation Board
DOCUMENTATION
Data Sheet
AD7171: 16-Bit, Low Power, Sigma-Delta ADC Data Sheet
User Guides
UG-081: Evaluation Board for the AD7171 16-Bit, Low
Power Sigma-Delta ADC
SOFTWARE AND SYSTEMS REQUIREMENTS
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KC705 Reference Design
REFERENCE DESIGNS
CN0188
CN0218
REFERENCE MATERIALS
Technical Articles
MS-2210: Designing Power Supplies for High Speed ADC
DESIGN RESOURCES
AD7171 Material Declaration
PCN-PDN Information
Quality And Reliability
Symbols and Footprints
DISCUSSIONS
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SAMPLE AND BUY
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AD7171 Data Sheet
Rev. C | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Interface ............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Characteristics ................................................................ 5
Timing Diagrams ..................................................................... 5
Absolute Maximum Ratings ............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution .................................................................................. 6
Pin Configuration and Function Descriptions ............................. 7
Typical Performance Characteristics ............................................. 8
Output Noise and Resolution Specifications ................................ 9
ADC Circuit Information .............................................................. 10
Overview ..................................................................................... 10
Filter, Data Rate, and Settling Time ......................................... 10
Gain .............................................................................................. 10
Power-Down/Reset (
PDRST
) ................................................... 10
Analog Input Channel ............................................................... 10
Bipolar Configuration ................................................................ 10
Data Output Coding .................................................................. 11
Reference ..................................................................................... 11
Digital Interface .......................................................................... 11
Grounding and Layout .............................................................. 12
Applications Information .............................................................. 13
Temperature System ................................................................... 13
Signal Conditioning Circuit ...................................................... 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 14
REVISION HISTORY
6/2016—Rev. B to Rev. C
Change to Figure 14 ....................................................................... 13
6/2015—Rev. A to Rev. B
Added Table Number; Renumbered Sequentially ........................ 1
Changed NC Pin (Pin 10) to GND Pin (Pin 10), Figure 5 .......... 7
4/2013—Rev. 0 to Rev. A
Changes to Filter, Data Rate, and Settling Time Section ........... 10
Changes to Temperature System Section .................................... 13
Updated Outline Dimensions ....................................................... 14
Changes to Ordering Guide .......................................................... 14
10/2009—Revision 0: Initial Version

AD7171BCPZ-REEL7

Mfr. #:
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 1CH L/POWER 16-BIT SD GAIN 128 IC
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New from this manufacturer.
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