PRODUCT DESCRIPTION

The AD693 is a monolithic signal conditioning circuit which accepts low-level inputs from a variety of transducers to control a standard 4–20 mA, two-wire current loop. An on-chip voltage reference and auxiliary amplifier are provided for transducer excitation; up to 3.5 mA of excitation current is available when the device is operated in the loop-powered mode. Alternatively, the device may be locally powered for three-wire applications when 0–20 mA operation is desired.

FEATURES

Instrumentation Amplifier Front End

Loop-Powered Operation

Precalibrated 30 mV or 60 mV Input Spans

Independently Adjustable Output Span and Zero

Precalibrated Output Spans: 4–20 mA Unipolar

0–20 mA Unipolar

12 ± 8 mA Bipolar

Precalibrated 100 Ω RTD Interface

6.2 V Reference with Up to 3.5 mA of Current Available

Uncommitted Auxiliary Amp for Extra Flexibility

Optional External Pass Transistor to Reduce

Self-Heating Errors

AD693屬于集成電路（IC） > 傳感器和檢測器接口。亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的AD693傳感器和檢測器接口該系列產(chǎn)品可執(zhí)行信號調(diào)節(jié)、數(shù)據(jù)轉(zhuǎn)換、激勵生成和/或各種將傳感器或變送器機構(gòu)連接到主機設(shè)備所需的其他功能。示例包括用于 CCD 圖像傳感器的控制器、用于 4-20 mA 接口和類似應(yīng)用的電流變送器、超聲變送器前端、惠斯通電橋接口等。