Datasheet > MAX31865

MAX31865

更新时间： 2024-11-27 14:58:15

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
26页	841K
描述
RTD至数字输出转换器

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中文翻译

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数据手册

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MAX31865 数据手册

MAX31865

RTD-to-Digital Converter

General Description

Beneﬁts and Features

The MAX31865 is an easy-to-use resistance-to-digital

converter optimized for platinum resistance temperature

detectors (RTDs). An external resistor sets the sensitivity

for the RTD being used and a precision delta-sigma ADC

converts the ratio of the RTD resistance to the reference

resistance into digital form. The MAX31865’s inputs are

protected against overvoltage faults as large as Q45V.

Programmable detection of RTD and cable open and

short conditions is included.

● Integration Lowers System Cost, Simplifies Design

Efforts, and Reduces Design Cycle Time

• Simple Conversion of Platinum RTD Resistance to

Digital Value

• Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs

(PT100 to PT1000)

• Compatible with 2-, 3-, and 4-Wire Sensor Connections

• SPI-Compatible Interface

• 20-Pin TQFN and SSOP Packages

● High Accuracy Facilitates Meeting Error Budgets

• 15-Bit ADC Resolution; Nominal Temperature

Resolution 0.03125NC (Varies Due to RTD Nonlin-

earity)

Applications

● Industrial Equipment

● Medical Equipment

● Instrumentation

• Total Accuracy Over All Operating Conditions:

0.5NC (0.05% of Full Scale) max

• Fully Differential V

Inputs

REF

• 21ms (max) Conversion Time

● Integrated Fault Detection Increases System

Reliability

Ordering Information appears at end of data sheet.

• ±45V Input Protection

• Fault Detection (Open RTD Element, RTD Shorted to

Out-of-Range Voltage, or Short Across RTD Element)

Typical Application Circuits

4-WIRE SENSOR CONNECTION

0.1µF

BIAS

REFIN+

REF

DRDY

SDI

REFIN-

ISENSOR

CABLE

MAX31865

HOST

INTERFACE

SCLK

FORCE+

FORCE2

CABLE

SDO

N.C.

RTDIN+

C *

RTD

CABLE

RTDIN-

FORCE-

*C = 10nF FOR 1kΩ RTD

100nF FOR 100Ω RTD

Typical Application Circuits continued at end of data sheet.

19-6478; Rev 3; 7/15

12 3 4 5 6 7...26

中文翻译

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