1B21AN集成電路（IC）的傳感器檢測(cè)器接口規(guī)格書PDF中文資料

1B21AN屬于集成電路（IC）的傳感器檢測(cè)器接口。由亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的1B21AN傳感器和檢測(cè)器接口該系列產(chǎn)品可執(zhí)行信號(hào)調(diào)節(jié)、數(shù)據(jù)轉(zhuǎn)換、激勵(lì)生成和/或各種將傳感器或變送器機(jī)構(gòu)連接到主機(jī)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。

GENERAL DESCRIPTION

The 1B21 is an isolated voltage-to-current converter that incorporates a unique circuit design utilizing transformer-based isolation and automated surface-mount manufacturing technology. It provides an unbeatable combination of versatility and perfor-mance in a compact plastic package. Designed for industrial applications, it is especially suited for harsh environments with extremely high common-mode interference.

Functionally, the V/I converter consists of four basic sections: input conditioning, modulator, demodulator and current source (see Figure 1). The input is a resistor-programmable gain stage that accepts a 0 V to 1 V up to 0 V to 10 V voltage input. This maps into a 0 mA to 20 mA output or can be offset by 20 using the internal reference for 4 mA to 20 mA operation. The high level signal is modulated and passed across the barrier which provides complete input to output galvanic isolation of 1500 V rms continuous by the use of transformer-coupling techniques. Nonlinearity is an excellent ±0.05 maximum.

Designed for multichannel applications, the 1B21 requires an external loop supply and can accept up to 30 V maximum. This

provides a loop supply compliance of 27V, which is sufficient to drive a 1.35 kΩ load resistance.

The 1B21 is fully specified over ?25°C to +85°C and operates over the industrial (?40°C to +85°C) temperature range.

DESIGN FEATURES AND USER BENEFITS

High CMV Isolation. The 1B21 features high input to output galvanic isolation to eliminate ground loops and offer protection against damage from transients and fault voltages. The isolation barrier will withstand continuous CMV of 1500V rms and meets the IEEE Standard for Transient Voltage Protection (Std. 472-SWC).

Small Size. The 1B21 package size (0.7” × 2.1” DIP) makes it an excellent choice in multichannel systems for maximum channel density. The 0.35” height also facilitates applications with limited board clearance.

Ease of Use. Complete isolated voltage-to-current conversion with minimum external parts required to get a conditioned current signal. No external buffers or drivers are required.

FEATURES

Wide input range: 0 V to 1 V up to 0 V to 10 V

High CMV isolation: 1500 V rms

Programmable output ranges: 4mA to 20mA

0 to 20 mA

Load resistance range: 0 to 1.35 kΩ maximum

High accuracy

Low offset tempco: ±300 nA/°C

Low gain tempco: ±50 ppm/°C

Low nonlinearity: ±0.02

High CMR: 90 dB minimum

Small package: 0.7” × 2.1” × 0.35”

Meets IEEE Standard 472: transient protection (SWC)

APPLICATIONS

Multichannel process control

DAC—current loop interface

Analog transmitters and controllers

Remote data acquisition systems