AD694

更新时间： 2024-02-27 10:44:49

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
12页	428K
描述
4.20 mA Transmitter

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AD694 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	DIP
包装说明：	DIP,	针数：	16
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	0.64
Samacsys Confidence：	3	Samacsys Status：	Released
2D Presentation：	https://componentsearchengine.com/2D/0T/169175.1.2.png	Schematic Symbol：	https://componentsearchengine.com/symbol.php?partID=169175
PCB Footprint：	https://componentsearchengine.com/footprint.php?partID=169175	3D View：	https://componentsearchengine.com/viewer/3D.php?partID=169175
Samacsys PartID：	169175	Samacsys Image：	https://componentsearchengine.com/Images/9/AD694JNZ.jpg
Samacsys Thumbnail Image：	https://componentsearchengine.com/Thumbnails/1/AD694JNZ.jpg	Samacsys Pin Count：	16
Samacsys Part Category：	Integrated Circuit	Samacsys Package Category：	Dual-In-Line Packages
Samacsys Footprint Name：	N-16	Samacsys Released Date：	2015-06-25 00:00:00
Is Samacsys：	N	模拟集成电路 - 其他类型：	ANALOG CIRCUIT
JESD-30 代码：	R-PDIP-T16	JESD-609代码：	e3
长度：	20.13 mm	功能数量：	1
端子数量：	16	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT APPLICABLE
认证状态：	Not Qualified	座面最大高度：	5.33 mm
最大供电电压 (Vsup)：	36 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	24 V	表面贴装：	NO
温度等级：	COMMERCIAL	端子面层：	Matte Tin (Sn)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT APPLICABLE
宽度：	7.62 mm	Base Number Matches：	1

AD694 数据手册

4–20 mA Transmitter

AD694*

FUNCTIONAL BLOCK DIAGRAM

FEATURES

4–20 mA, 0–20 mA Output Ranges

Precalibrated Input Ranges:

0 V to 2 V, 0 V to 10 V

Precision Voltage Reference

Programmable to 2.000 V or 10.000 V

Single or Dual Supply Operation

Wide Power Supply Range: +4.5 V to +36 V

Wide Output Compliance

Input Buffer Amplifier

Open-Loop Alarm

Optional External Pass Transistor to Reduce

Self-Heating Errors

0.002% typ Nonlinearity

PRODUCT DESCRIPTION

PRODUCT HIGHLIGHTS

The AD694 is a monolithic current transmitter that accepts

high level signal inputs to drive a standard 4–20 mA current

loop for the control of valves, actuators, and other devices com-

monly used in process control. The input signal is buffered by

an input amplifier that can be used to scale the input signal or

buffer the output from a current mode DAC. Precalibrated in-

put spans of 0 V to 2 V and 0 V to 10 V are selected by simple

pin strapping; other spans may be programmed with external

resistor.

1. The AD694 is a complete voltage in to 4–20 mA out current

transmitter.

2. Pin programmable input ranges are pre-calibrated at 0 V to

2 V and 0 V to 10 V.

3. The input amplifier may be configured to buffer and scale the

input voltage, or to serve as an output amplifier for current

output DACs.

4. The output voltage compliance extends to within 2 V of the

positive supply and below common. When operated with a

5 V supply, the output voltage compliance extends 30 V be-

low common.

The output stage compliance extends to within 2 V of V_Sand its

special design allows the output voltage to extend below com-

mon in dual supply operation. An alarm warns of an open 4-to-

20 mA loop or noncompliance of the output stage.

5. The AD694 interfaces directly to 8-, 10-, and 12-bit single

supply CMOS and bipolar DACs.

Active laser trimming of the AD694’s thin film resistors results

in high levels of accuracy without the need for additional adjust-

ments and calibration. An external pass transistor may be used

with the AD694 to off-load power dissipation, extending the

temperature range of operation.

6. The 4 mA zero current may be switched on and off with a

TTL control pin, allowing 0–20 mA operation.

7. An open collector alarm warns of loop failure due to open

wires or noncompliance of the output stage.

8. A monitored output is provided to drive an external pass

transistor. The feature off-loads power dissipation to extend

the temperature range of operation and minimize self-heating

error.

The AD694 is the ideal building block for systems requiring

noise immune 4–20 mA signal transmission to operate valves,

actuators, and other control devices, as well as for the transmis-

sion of process parameters such as pressure, temperature, or

flow. It is recommended as a replacement for discrete designs in

a variety of applications in industrial process control, factory

automation, and system monitoring.

The AD694 is available in hermetically sealed, 16-pin cerdip

and plastic SOIC, specified over the –40°C to +85°C industrial

temperature range, and in a 16-pin plastic DIP, specified over

the 0°C to +70°C temperature range.

*Protected by U.S. Patents: 30,586; 4,250,445; 4,857,862.

REV. A

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 rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

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