Datasheet > AD7172-4

AD7172-4

更新时间： 2024-11-05 01:17:51

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亚德诺 - ADI		/
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描述
ADC with True Rail-to-Rail Buffers

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AD7172-4 数据手册

Low Power, 24-Bit, 31.25 kSPS, Sigma-Delta

ADC with True Rail-to-Rail Buffers

AD7172-4

Data Sheet

FEATURES

GENERAL DESCRIPTION

Fast and flexible output rate: 1.25 SPS to 31.25 kSPS

Channel scan data rate of 6.21 kSPS/channel (161 μs settling)

Performance specifications

17.2 noise free bits at 31.25 kSPS

24 noise free bits at 5 SPS

INL: 2 ppm of FSR

85 dB rejection of 50 Hz and 60 Hz with 50 ms settling

User configurable input channels

4 fully differential channels or 8 single-ended channels

Crosspoint multiplexer

True rail-to-rail analog and reference input buffers

Internal or external clock

The AD7172-4 is a low noise, low power, multiplexed, Σ-Δ analog-

to-digital converter (ADC) with 4- or 8-channel (fully differential/

single-ended) inputs for low bandwidth signals. The AD7172-4

has a maximum channel scan rate of 6.21 kSPS (161 μs) for fully

settled data. The output data rates range from 1.25 SPS to 31.25 kSPS.

The AD7172-4 integrates key analog and digital signal condition-

ing blocks to allow users to configure an individual setup for

each analog input channel in use via the SPI. Integrated true rail-to-

rail buffers on the analog inputs and reference inputs provide easy

to drive high impedance inputs.

The digital filter allows simultaneous 50 Hz and 60 Hz rejection

at a 27.27 SPS output data rate. The user can switch between

different filter options according to the demands of each channel

in the application, with further digital processing functions such

as offset and gain calibration registers, which are configurable

on a per channel basis. General-purpose input/outputs (GPIOs)

control external multiplexers synchronous to the ADC conversion

timing. The specified temperature range is −40°C to +105°C.

The AD7172-4 is in a 5 mm × 5 mm, 32-lead LFCSP.

Power supply

AVDD1 = 3.0 V to 5.5 V, AVDD2 = IOVDD = 2 V to 5.5 V

Split supply with AVDD1 and AVSS at 2.5 V or 1.65 V

ADC current: 1.5 mA

Temperature range: −40°C to +105°C

3- or 4-wire serial digital interface (Schmitt trigger on SCLK)

Serial port interface (SPI), QSPI-, MICROWIRE-, and DSP-

compatible

Note that, throughout this data sheet, the dual function pin

names are referenced by the relevant function only.

APPLICATIONS

Process control: PLC/DCS modules

Temperature and pressure measurement

Medical and scientific multichannel instrumentation

Chromatography

FUNCTIONAL BLOCK DIAGRAM

AVDD1 AVDD2 REGCAPA REF– REF+

IOVDD REGCAPD

1.8V

CROSSPOINT

MULTIPLEXER

1.8V

LDO

RAIL-TO-RAIL

REFERENCE

INPUT

LDO

BUFFERS

RAIL-TO-RAIL

AIN0/REF2–

AIN1/REF2+

ANALOG

INPUT

AVDD

BUFFERS

SCLK

DIN

SERIAL

INTERFACE

AND CONTROL

DIGITAL

Σ-∆ ADC

FILTER

DOUT/RDY

SYNC

ERROR

AIN7

AIN8

XTAL AND INTERNAL

CLOCK OSCILLATOR

CIRCUITRY

I/O AND EXTERNAL

MUX CONTROL

AVSS

AD7172-4

AVSS

PDSW

GPIO0 GPIO1 GPO2 GPO3

XTAL1 XTAL2/CLKIO

DGND

Figure 1.

Rev. B

Document Feedback

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

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registeredtrademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Technical Support

www.analog.com

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与AD7172-4相关器件

型号	品牌	获取价格	描述	数据表
AD7172-4_17	ADI	获取价格	ADC with True Rail-to-Rail Buffers
AD7172-4BCPZ	ADI	获取价格	Low Power, with 4- or 8-channel, 24-bit, 31.
AD7172-4BCPZ-RL	ADI	获取价格	Low Power, with 4- or 8-channel, 24-bit, 31.
AD7172-4BCPZ-RL7	ADI	获取价格	Low Power, with 4- or 8-channel, 24-bit, 31.
AD7173-8	ADI	获取价格	Low Power, 8-/16-Channel, 31.25 kSPS, 24-Bit, Highly Integrated Sigma-Delta ADC
AD7173-8BCPZ	ADI	获取价格	Low Power, 8-/16-Channel, 31.25 kSPS, 24-Bit, Highly Integrated Sigma-Delta ADC
AD7173-8BCPZ-RL	ADI	获取价格	Low Power, 8-/16-Channel, 31.25 kSPS, 24-Bit, Highly Integrated Sigma-Delta ADC
AD7175-2	ADI	获取价格	24-Bit, 250 kSPS, Sigma-Delta ADC Settling and True Rail-to-Rail Buffers
AD7175-2_17	ADI	获取价格	24-Bit, 250 kSPS, Sigma-Delta ADC Settling and True Rail-to-Rail Buffers
AD7175-2BRUZ	ADI	获取价格	24-Bit, 250 kSPS, Sigma-Delta ADC with 20 µs Settling and True Rail-to-Rail Buffe

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