Precision current-transmitter/source-sink calibrator has wid

Based on a precision op amp (MAX4236), this loop-powered, high-compliance, precision current sink (or source) can be modified for use as a 4–20mA sink transmitter.

A similar version of this article appeared in the March 24, 2009 issue of ED magazine.

Many industrial I&C applications use analog current loops as the physical link for measurements and actuator control. Current loops in the 4–20mA and 5–50mA ranges are typical, along with others less common. Most popular and still surviving is the 4–20mA standard.

Loop accuracy depends on the transmitter's ability to transform the sensor signal to a current, and on the stability of the current-transfer function (measured at the receiver) with respect to temperature, physical length of the loop, stability of the loop-supply voltage, and other uncertainties that appear as the hardware deteriorates with age.

Besides linearity and stability of its current-transfer function, the transmitter output of a current-loop circuit must provide a large dynamic impedance, to minimize the influence of loop voltage (at the transmitter terminals) on output current. The maximum voltage tolerated at the terminals is also important. The higher the better, because the electromagnetic environment in industrial plants is not always benign. The minimum allowed transmitter-terminal voltage, which determines the maximum loop length for a given wire gauge (or the minimum wire cross-section needed for a given loop run) should be minimized at the same time.

The transmitter circuit of Figure 1 provides a very high output impedance (10⁸ to 10⁹ ohms) and a wide compliance range (4V to 90V). The lower limit is set by the amplifier's minimum operating voltage, and the upper limit by the power dissipation allowed in the output device (an n-channel depletion MOSFET) at the 20mA high end of the current range. For brief periods of 20ms or so, the maximum voltage can go as high as 200V.

Figure 1. This basic loop-powered, high-compliance, precision current sink (or source) (a) can be modified for use as a 4–20mA sink transmitter (b).

The basic circuit (Figure 1a) is configured as a loop calibrator. With the components shown, it can operate with 10-bit accuracy from 0°C to 85°C, plus the added uncertainty of resistor R. Having only two terminals, it can operate as either a sinking or a sourcing calibrator.

In Figure 1b, this circuit is modified for use as an interface to an open-loop current sensor with 0V-to-4V output range. Accuracy of the transfer function in this case depends on the reference (MAX6138) and the precision of the resistors in the interface network. Because the reference equipotential (ground) is shared by the instrument and the transmitter, you should exercise care not to create ground loops in the circuit implementation.

The MAX4236 input characteristics (20µV maximum offset and 2µV/°C offset temperature drift), its high gain (110dB), and its ability to operate with inputs down to the negative rail, makes negligible the influence of all other components. To achieve higher accuracy, therefore, you must use standard trimming techniques that employ either mechanical or integrated-circuit adjustment potentiometers.

The MAX4236 ability to operate with input voltages down to the negative rail is essential for circuit accuracy, because it allows the amplifier's operating current to be forced through the output current-sense resistor, where it becomes a part of the output current under circuit control. Further information, including full data sheets for the MAX4236, MAX5490, and MAX6138 is available at www.maxim-ic.com.

阅读全文

Precision(20474) Precision(20474)
current(47511) current(47511)
compliance(7976) compliance(7976)

11613B Calibrator操作和维修手册

Provides information on getting started, using the calibrator with the 8757A, 8756A, and 8755A/B/C, operator's check, and service for the 11613B.

2019-10-28 10:34:34

5V低功耗TEC驱动器电源管理电路

buck-boost(...)主要特色Source and sink current capabilities to drive a TECPositive and negative current limitUp

2018-12-04 14:41:10

6186C精密恒流源操作和维修手册

06186-90005 (January 1975) The 6186C Precision Constant Current Source is a discontinued product. This manual is provided for information only.

2018-11-15 10:42:38

738BR Voltmeter Calibrator操作和维修手册

00738-90003 (February 1974) The 738BR Voltmeter Calibrator is a discontinued product. This manual is provided for information only.

2018-11-06 16:29:59

745A AC Calibrator操作和维修手册

00745-90003 (January 1968) 745A AC Calibrator is a discontinued product. This manual is provided for information only.

2018-10-16 10:10:49

HAS50-S_06

HAS50-S_06 - Current Transducer - LEM

2022-11-04 17:22:44

Altium如何消除Net has no driving source警告

在Altium Designer中对原理图进行编译时，有时会有告警信息：Net has no driving source。下面就如何消除这个类型的告警信息进行说明。方法一：将对应元件的管脚类型修改

2019-09-17 14:42:11

Bipolar Current Source

I learned a current source made by amplifier and transistor , I checked it in the book, but I can't

2011-09-06 16:01:12

CS32G020作为sink如何发送request请求

本帖最后由 shaaicao 于 2020-8-26 08:45 编辑当设备当做SINK时，我如何配置AP_PDB以请求对方快充电源输出我想要的电压，比如12V,3A，在对方SOURCE_CAP的第3的位置。使用底层库的PD_ProtSendDataMsg也没效。

2020-08-24 15:58:39

CS32G051 是在Source和SINK都可以使用么？是一一配对的？

CS32G051 是在Source和SINK都可以使用么？是一一配对的？

2023-09-01 09:42:11

DAC芯片DS4432

DS4432是7-Bit Sink/Source Current DAC，在发送8位数据的时候最高位为0是Sink模式，最高位为1时是Source，我以前用的DAC芯片都是8位的，不用设置Sink或

2015-03-03 08:57:50

Gowin SPDIF Transmitter IP用户指南

本次发布 Gowin SPDIF Transmitter IP 及其用户指南。Gowin SPDIF Transmitter IP 的用户指南可在高云官网下载。

2022-10-09 06:44:01

NumericScale 和 Precision 属性范例 (VB)

NumericScale 和 Precision 属性范例 (VB)本范例使用 NumericScale 和 Precision 属性来显示 Pubs 数据库 Discounts 表中字段的数值范围

2009-01-08 10:22:55

Protect Current-Sense Amplifiers from Negative Overvoltage

the current-sense amplifier's precision input characteristics.A better solution, then, is to connect PMOS

2011-08-21 16:49:34

SL4007 大功率升压恒压芯片 2.8-24V输入输出ADJ 大功率拉杆音响电源驱动芯片

of erroramplifier connects to a 1.2V precision reference voltage. It has programmable switching

2021-08-19 16:14:24

STM8S105/103的I/O引脚的安全漏极/源极电流是多少？

STM8S105 / 103的I / O引脚的“安全”漏极/源极电流是多少？以上来自于谷歌翻译以下为原文 What is 'safe' sink/source current for I/O pins for STM8S105/103

2019-02-19 15:50:27

matlab中如何通过设置使AC Current Source模块成为直流电流源模块

matlab中如何通过设置使AC Current Source模块成为直流电流源模块。1.如下图路径中找到AC Current Source模块。2.拖拽到model中后，左键双击出现如下情形。3.对应公式如图。4.根据需要修改对应值，我需要2A的...

2021-12-31 06:01:53

为什么使用ucpd1作为source时连接sink设备不会发送source capabilities呢

我是通过stm32cubemx设置的，只是用ucpd1作为source，但是连接sink设备的时候不会发送source capabilities。我不确定是代码还是硬件影响了它。我在

2022-12-06 06:47:25

单通道隔离式3线电流环路发送器包括BOM及层图

描述 This single-channel, input-isolated, three-wire current loop transmitter reference design

2018-10-24 16:38:04

怎样通过设置AC Current Source模块使成为直流电流源模块呢

在MATLAB中怎样通过设置AC Current Source模块使成为直流电流源模块？有哪些步骤？

2021-10-08 09:14:05

有人知道为什么MIG IP核中的AXI协议。为什么没有AXI_WID这个信号呢？

有人知道为什么MIG IP核中的AXI协议。为什么没有AXI_WID这个信号呢。

2018-04-13 09:22:30

求解DXP的Error:Contains floation pins 和Warning:has no driving source问题

floation input Pins[PinU2_8]）;一是警告：没有驱动源（如：netU2in8 has no driving source[Pinu2_8]），同时在原理图相关地方出现红色的和蓝色的波浪

2016-07-18 12:53:37

请问H桥驱动芯片datasheet中的source driver,sink driver分别是什么意思？

H桥驱动芯片datasheet中的source driver,sink driver分别是什么意思？？？？希望明白人帮帮忙。。

2019-06-12 21:57:04

通过HPI获取当前的PDO配置文件

in source or sink mode through HPI interface, we added Sink pdo 5V@3A, 9V@3A, 12V@3A, 15V@3A, 20V@3A

2018-09-05 16:12:15

sn75176.pdf

The driver is designed to handle loads up to 60 mA of sink or source current. The driver features

2008-04-26 23:55:08

436

MAX17000 pdf

for notebookDDR, DDR2, and DDR3 memory. It comprises a step-down controller, a source-sink LDO regulator, and a ref-erence buffer to g

2008-06-30 13:40:36

XTR105 pdf datasheet (4-20mA, two-wire current transmitter)

The XTR105 is a monolithic 4-20mA, two-wirecurrent transmitter with two precision current

2008-12-19 19:45:34

MAX17000A pdf datasheet (Compl

for notebook DDR, DDR2, and DDR3 memory. It comprises a step-down controller, a source-sink LDO regulator, and a reference buffer to generate the requ

2009-03-02 14:59:01

DS4402, DS4404 pdf datasheet (

, that are each capable of sinking or sourcing current. Each output has 31 sink and 31 source settings that are programmed by the I²C interface.

2009-04-16 16:11:23

DS4422, DS4424 pdf datasheet (

of sinking and sourcing current up to 200μA. Each DAC output has 127 sink and 127 source settings that are programmed using the I²C in

2009-04-16 16:14:57

DS4412 pdf datasheet (Adjustab

or sourcing current. Each output has 15 sink and 15 source settings that are programmed by I²C interface. The full-scale range and step size of

2009-04-16 16:17:02

制作一个精确的电流源(电流流出或吸收)

accurate current source and current sink?” Figures 1 and 2 respectively show the circuits for making precision current sources and sink

2009-06-01 11:13:38

Current Driver/Repeater KFD0-CS-Ex2.51P

)Current input/output 0 mA ... 40 mAI/P or transmitter power supplyAccuracy 1 %Reverse

2022-11-04 09:42:54

介绍CY7C42X CY7C46X FIFO与CY7B923

as a high-precision, flexible,and programmable Emitter-Coupled-Logic (ECL) orPositive-Emitter-Coupled Logic (PECL) clock source. Issu

2009-06-15 16:17:24

DS4426,pdf datasheet (Quad-Cha

. External resistors set the full-scale range of each output. Each DAC output has 127 sink and 127 source steps that are programmed by the I&su

2009-07-25 21:45:01

AD5422,pdf datasheet (Current

(DAC) offering a pro-grammable current source and programmable voltage output designed to meet the requirements of industrial process contr

2009-09-18 09:55:53

LM94022/LM94022Q,datasheet,pdf

at a supply voltageas low as 1.5 Volts. A class-AB output structure gives theLM94022 strong output source and sink current capabili

2009-10-20 14:23:26

ADR127,datasheet,pdf(Precision

references with sink and source capability. The parts feature high accuracy and low power consumption in a tiny package. The ADR12x design includ

2009-10-23 09:53:02

ADR121/ADR125/ADR127,datasheet

references with sink and source capability. The parts feature high accuracy and low power consumption in a tiny package. The ADR12x design includ

2009-10-23 10:57:52

RT9026,pdf datasheet (3A sink/

RT9026 is a 3A sink/source tracking termination regulator. It is specifically designed for low-cost

2009-11-20 10:13:40

350mA ADVANCED CURRENT REGULAT

The AMC7135 is a low dropout current regulator rated for 350mA constant sink current. The low

2009-12-04 15:01:44

REF200,pdf(Dual Current Source

100µA currentsources and a current mirror. The sections aredielectrically isolated, making them completelyindependent.

2010-06-13 09:44:48

AS3691,pdf (4x400mA Precision

The AS3691 features four high precision current sources for driving up to four LED strings (RGB

2010-09-06 09:34:09

INA129-EP,pdf(Precision Low Po

The versatile 3-op amp design and small size make it ideal for a wide range of applications. Current-feedback input circuitry provides wid

2010-09-24 21:32:53

XTR106,pdf( 4-20mA Current Tra

The XTR106 is a low cost, monolithic 4-20mA, two-wire current transmitter designed for bridge

2010-09-26 00:02:57

XTR111,pdf(Precision Voltage-t

The XTR111 is a precision voltage-to-current converter designed for the standard 0mA–20mA or 4mA

2010-09-26 00:20:33

XTR117,pdf(4-20mA Current-Loop

The XTR117 is a precision current output converter designed to transmit analog 4-20mA signals over

2010-09-26 00:28:52

120

UC29432,UC39432,UC39432B,pdf(P

The UC39432 is an adjustable precision analog controller with 100mA sink capability if the ISET pin

2010-10-01 22:22:48

TPS51100,PDF(3-A SINK/SOURCE D

The TPS51100 is a 3-A sink/source tracking termination regulator. It is specifically designed

2010-10-12 21:50:17

TPS51200-Q1,pdf(Sink/Source DD

The TPS51200 is a sink/source Double Data Rate (DDR) termination regulator specifically designed

2010-10-20 23:11:24

TLC5971,pdf(12-Channel, 16-Bit

The TLC5971 is a 12-channel, constant-current sink driver. Each output channel has individually

2010-11-02 21:13:57

TLC59401,pdf(16-Channel LED Dr

The TLC59401 is a 16-channel, constant-current sink, LED driver. Each channel has an individually

2010-11-02 21:57:30

TLC5941-Q1,pdf(16-Channel LED

The TLC5941 is a 16-channel, constant-current sink, LED driver. Each channel has an individually

2010-11-02 22:08:28

TLC5945,pdf(16 Channel LED Dri

The TLC5945 is a 16-channel, constant-current sink, LED driver. Each channel has an individually

2010-11-02 22:57:57

TLC5924,pdf(16-Channel LED Dri

The TLC5924 is a 16 channel constant–current sink driver. Each channel has a On/Off state and a 128

2010-11-02 23:00:11

TLC5941,pdf(16 Channel LED Dri

The TLC5941 is a 16-channel, constant-current sink, LED driver. Each channel has an individually

2010-11-02 23:02:52

TLC5923,pdf(16 Channel LED Dri

The TLC5923 is a 16 channel constant-current sink driver. Each channel has a On/Off state

2010-11-02 23:07:43

TLC5940,pdf(16 Channel LED Dri

The TLC5940 is a 16-channel, constant-current sink LED driver. Each channel has an individually

2010-11-02 23:13:29

TLC5922,pdf(LED Driver)

The TLC5922 is a 16-channel constant-current sink driver. Each channel has an On/Off state

2010-11-02 23:15:01

Transmitter Reference Design f

Transmitter Reference Design for a 900MHz Full-Duplex Radio Abstract: This reference design

2008-08-18 13:47:25

918

MAX9610 Tiny Current-Sense Amp

MAX9610 Tiny Current-Sense Amplifier Delivers Precision Monitoring and 1µA Supply Current

2009-01-22 16:32:02

1109

Precision Current Source is So

that, in conjunction with an op amp and transistor, forms a software-programmable, voltage-controlled current source. With t

2009-04-29 09:28:00

1984

精密电流源：Precision Current Source

精密电流源：Precision Current SourceThe precision current source is shown in Figures 17, 18.

2009-05-16 16:08:04

5293

DS4426 Low-cost, quad sink/sou

DS4426 Low-cost, quad sink/source current DAC for power-supply adjustments and tracking

2009-08-27 15:10:18

712

Medium range transmitter

Medium range transmitter

2009-12-22 10:02:47

1078

Crosby direct FM transmitter b

Crosby direct FM transmitter blocck diagram

2009-12-22 10:49:02

1907

Stereo FM transmitter block di

Stereo FM transmitter block diagram

2009-12-22 10:52:43

1454

FM Transmitter

FM Transmitter A portable FM transmitter that can be used to replace a FM microphone.

2009-12-22 10:55:00

1866

AM Transmitter

AM Transmitter Notes:Please read the disclaimer on this

2009-12-22 10:56:35

1420

FM Transmitter Circuit

FM Transmitter Circuit Parts List: R1 4K7

2009-12-22 11:09:37

1438

PWM-controlled 4–20mA transmit

This loop-powered, 4–20mA precision transmitter includes a precision PWM signal coupler

2010-08-07 21:48:26

1660

Derive simple high-current sou

, and a separate control voltage, this adjustable current source provides a 1-to-1 ratio of control voltage to load current (1A/V). A similar ver

2010-08-07 22:03:30

1130

Precision constant-current sin

Precision constant-current sink provides wide, close-to-the-rail compliance Abstract

2010-08-21 21:10:27

1481

MAX4372 pdf(low-cost, precision, high-side current-sense amplifier)

The MAX4372 low-cost, precision, high-side current-sense amplifier is available in a tiny

2011-09-19 11:22:09

XTR111_Precision_Voltage-to-Current_Converter/Transmitter

xtr111精密电压-电流传送器4-20ma

2016-02-26 10:55:14

单通道12/16位串行输入4毫安20毫安电流源数模转换器HART连接ad5410/ad5420数据表

a programmable current source output designed to meet the requirements of industrial process control applications.

2017-10-12 16:36:57

SV-IS7变频器安装及配线

iS7 提供2 种控制电路的川郧字输入端子信号选泽： NPN 模式（SINK mode）和PNP 模式（SOURCE mode）。通过改变NPN（SINK）/PNP （SOURCE）设定，可以

2017-10-24 17:02:53

无线传感网的Sink节点移动路径规划

为寻找传感节点均匀分布时Sink节点的最优移动路径和最大网络生存时间，提出一种无线传感网的Sink节点移动路径规划算法MPOA）。在MPOA算法中，将Sink节点的数据收集范围分解成多个圆环，将监测

2018-01-18 15:20:58

XTR111 Precision Voltage-to-Current Converter/Transmitter

德赢Vwin官网网为你提供TI(ti)XTR111相关产品参数、数据手册，更有XTR111的引脚图、接线图、封装手册、中文资料、英文资料，XTR111真值表，XTR111管脚等资料，希望可以帮助到广大的电子工程师们。

2018-09-06 17:39:26

常见的恒流源结构和特点及方案说明

恒流源是电路中广泛使用的一个组件，这里我整理一下比较常见的恒流源的结构和特点。恒流源分为流出（Current Source）和流入（Current Sink）两种形式。

2020-05-13 08:00:00

传感器与PLC如何实现接线

PLC 的数字量输入端子，按电源分直流与交流，按输入接口分类由单端共点输入与双端输入，单端共点接电源正极为 SINK（sink Current 拉电流），单端共点接电源负极为 SRCE（source Current 灌电流）。

2020-12-30 02:57:00

LTC2672: Five-Channel, Low Dropout, 300 mA, Current Source Output, 16-Bit SoftSpan DAC Data Sheet

LTC2672: Five-Channel, Low Dropout, 300 mA, Current Source Output, 16-Bit SoftSpan DAC Data Sheet

2021-01-27 23:00:27

ADA4177-2CHIPS: OVP and EMI Protected, Precision, Low Noise and Low Bias Current Op Amp Data Sheet

ADA4177-2CHIPS: OVP and EMI Protected, Precision, Low Noise and Low Bias Current Op Amp Data Sheet

2021-01-28 12:52:20

ADR441ACHIPS: Ultralow Noise, LDO, XFET, Voltage Reference with Current Sink and Source Data Sheet

ADR441ACHIPS: Ultralow Noise, LDO, XFET, Voltage Reference with Current Sink and Source Data Sheet

2021-01-29 11:16:16

LTC2066/LT1389 Demo Circuit - Precision Ultralow Power High Side Current Sense

LTC2066/LT1389 Demo Circuit - Precision Ultralow Power High Side Current Sense

2021-02-01 14:38:28

LT3092: 200mA 2-Terminal Programmable Current Source Data Sheet

LT3092: 200mA 2-Terminal Programmable Current Source Data Sheet

2021-02-20 13:07:23

LTM8064 Demo Circuit - CVCC Source/Sink Step-Down Regulator (7.5-58V to 5V @ ±6A)

LTM8064 Demo Circuit - CVCC Source/Sink Step-Down Regulator (7.5-58V to 5V @ ±6A)

2021-02-21 13:01:22

LT3066 Demo Circuit - 3.3V Supply with 497mA Precision Current Limit (3.6-45V to 3.3V @ 450mA)

LT3066 Demo Circuit - 3.3V Supply with 497mA Precision Current Limit (3.6-45V to 3.3V @ 450mA)

2021-03-11 11:02:19

LT1880：SOT-23，Rail-to-Rail Output，PioAmp Input Current Precision Op Amp数据表

LT1880：SOT-23，Rail-to-Rail Output，PioAmp Input Current Precision Op Amp数据表

2021-04-26 16:00:02

MATLAB中如何通过设置AC Current Source模块使成为直流电流源模块。

2022-01-10 15:17:38

PD3.0详解第十一章策略层电源协商（三）（sink端）

前面大师匈介绍了Source端的内容，今天再看一下sink端的内容。大师匈还是想把标准文件的状态机拿出来说一下。大师匈把一张图分成俩部分，大家凑合看一下，一张图实在看不清内容。Sink 端电源协商

2022-01-11 12:20:43

DisplayPort-DP接口知识

DP设有专用总线，即AUX Channel，用于source和sink之间的握手。因为source是过程的控制装置，它为sink提出请求。sink与source进行通信的唯一途径是在热插拔检测（HPD）信号中发出一个脉冲。

2022-12-19 10:25:01

2428

ADR3625/ADR3630/ADR3650: Precision, Micropower, High Current Output Voltage References Data Sheet ADR3625/ADR3630/ADR3650: Precision, Microp

德赢Vwin官网网为你提供ADI(ADI)ADR3625/ADR3630/ADR3650: Precision, Micropower, High Current Output Voltage

2023-10-12 18:46:26

MAX40080: Precision, Fast Sample-Rate, Digital Current-Sense Amplifier Data Sheet MAX40080: Precision, Fast Sample-Rate, Digital Current-Sen

德赢Vwin官网网为你提供ADI(ADI)MAX40080: Precision, Fast Sample-Rate, Digital Current-Sense Amplifier Data Sheet

2023-10-16 18:38:32

MAX49921: 0 to 70V, High-Precision Current-Sense Amplifier Data Sheet MAX49921: 0 to 70V, High-Precision Current-Sense Amplifier Data Sheet

德赢Vwin官网网为你提供ADI(ADI)MAX49921: 0 to 70V, High-Precision Current-Sense Amplifier Data Sheet相关产品参数、数据手册

2023-10-16 18:57:04

MAX9634: nanoPower, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier Data Sheet MAX9634: nanoPower, 4-Bump UCSP/SOT23, Precision Current

德赢Vwin官网网为你提供ADI(ADI)MAX9634: nanoPower, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier Data

2023-10-16 19:17:55

APEX微技术推出通用高压驱动器IC，具有8个高压推挽输出

输出可以驱动电容和电阻负载，例如压电换能器、电致发光器件和微机械致动器。最大工作电压为300V，每个输出具有高达40mA的source-sink能力。

2023-10-23 10:21:35

473

已全部加载完成

搜索历史

Precision current-transmitter/source-sink calibrator has wid

评论