Datasheet > AD7172-2BRUZ

AD7172-2BRUZ

更新时间： 2024-01-20 05:06:49

品牌	Logo	应用领域
亚德诺 - ADI		光电二极管转换器
页数	文件大小	规格书
61页	1139K
描述
True rail-to-rail analog and reference input buffers

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技术参数
数据手册

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AD7172-2BRUZ 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	TSSOP,
针数：	24	Reach Compliance Code：	compliant
风险等级：	2.29	最大模拟输入电压：	2.5 V
最小模拟输入电压：	-2.5 V	转换器类型：	ADC, DELTA-SIGMA
JESD-30 代码：	R-PDSO-G24	长度：	7.8 mm
最大线性误差 (EL)：	0.0005%	模拟输入通道数量：	4
位数：	24	功能数量：	1
端子数量：	24	最高工作温度：	105 °C
最低工作温度：	-40 °C	输出位码：	BINARY, OFFSET BINARY
输出格式：	SERIAL	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	NOT SPECIFIED
采样速率：	0.03125 MHz	座面最大高度：	1.2 mm
标称供电电压：	3.3 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	4.4 mm
Base Number Matches：	1

AD7172-2BRUZ 数据手册

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

ADC with True Rail-to-Rail Buffers

AD7172-2

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

The AD7172-2 is an intelligent, low noise, low power, multiplexed,

Σ-Δ analog-to-digital converter (ADC) with 2- or 4-channel

(fully differential/single-ended) inputs for low bandwidth

signals. The AD7172-2 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.

INL: 2 ppm of FSR

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

User configurable input channels

2 fully differential channels or 4 single-ended channels

Crosspoint multiplexer

On-chip 2.5 V reference ( 2 ppm/°C drift)

True rail-to-rail analog and reference input buffers

Internal or external clock

The AD7172-2 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 external reference inputs provide

easy to drive high impedance inputs. The precision 2.5 V low drift

(2 ppm/°C) band gap internal reference (with an output reference

buffer) adds embedded functionality to reduce the external

component count.

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

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 also configurable on

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

control external multiplexers synchronous to the ADC conversion

timing.

APPLICATIONS

Process control: PLC/DCS modules

Temperature and pressure measurement

Medical and scientific multichannel instrumentation

Chromatography

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

The AD7172-2 is in a 24-lead TSSOP package.

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

names are referenced by the relevant function only.

FUNCTIONAL BLOCK DIAGRAM

AVDD1 AVDD2 REGCAPA

REF– REF+ REFOUT

IOVDD REGCAPD

CROSSPOINT

MULTIPLEXER

AVDD1

AVSS

1.8V

LDO

1.8V

LDO

BUFFERED

PRECISION

REFERENCE

RAIL-TO-RAIL

REFERENCE

AIN0

AIN1

AIN2

AIN3

AIN4

INT

AVDD

REF

INPUT BUFFERS

SCLK

SERIAL

DIGITAL

FILTER

INTERFACE

AND CONTROL

Σ-Δ ADC

DIN

DOUT/RDY

SYNC/ERROR

RAIL-TO-RAIL

ANALOG INPUT

GPIO AND

MUX

XTAL AND INTERNAL

CLOCK OSCILLATOR

CIRCUITRY

BUFFERS

AVSS

I/O CONTROL

AD7172-2

TEMPERATURE

SENSOR

AVSS

GPIO0 GPIO1

XTAL1 XTAL2/CLKIO

DGND

Figure 1.

Rev. A

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

rightsof third parties that may result fromits 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 andregisteredtrademarks are the 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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