AD694BRZ

更新时间： 2024-02-05 04:20:06

品牌	Logo	应用领域
亚德诺 - ADI		模拟IC 信号电路光电二极管 PC
页数	文件大小	规格书
16页	163K
描述
4â20 mA Transmitter

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技术参数
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AD694BRZ 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

AD694BRZ 数据手册

AD694

An NPN boost transistor can be added in the 2 V mode to in-

crease the current drive capability of the 2 V reference. The

10 V force pin is connected to the base of the NPN, and the

NPN emitter is connected to the 2 V sense pin. The minimum

V_SOf the part increases by approximately 0.7 V.

0-20 mA OPERATION

A 0–20 mA output range is available with the AD694 by remov-

ing the 4 mA offset current with the 4 mA On/Off pin. In nor-

mal 4–20 mA operation, the 4 mA On/Off (Pin 9) is tied to

ground, enabling the 4 mA offset current. Tying Pin 9 to a po-

tential of 3 V or greater turns off the 4 mA offset current; con-

necting Pin 9 to the 10 V reference, the positive supply, or a

TTL control pin, is a convenient way to do this. In 0–20 mA

mode, the input span is increased by 20%, thus the

precalibrated input spans of 2 V and 10 V become 2.5 V and

12.5 V. Minimum supply voltages for the two spans increase to

5 V and 15 V.

4.5 V SINGLE SUPPLY OPERATION

For operation with a 4.5 V power supply, the input span and the

voltage reference output must be reduced to give the amplifiers

their required 2.5 V of headroom for operation. This is done by

adjusting the AD694 for 2 V full-scale input, and a voltage ref-

erence output of 2 V as described above.

The 4 mA On/Off pin may also be used as a “jiggle pin” to

unstick valves or actuators, or as a way to shut off a 4–20 mA

loop entirely. Note that the pin only removes the 4 mA offset

and not the signal current.

GENERAL DESIGN GUIDELINES

A 0.1 µF decoupling capacitor is recommended in all applica-

tions from V_S(Pin 13) to Com (Pin 5). Additional components

may be required if the output load is nonresistive, see section on

driving nonresistive loads. The buffer amplifier PNP inputs

should not be brought more negative than –0.3 V from com-

mon, or they will begin to source large amounts of current. In-

put protection resistors must be added to the inputs if there is a

danger of this occurring. The output of the buffer amplifier, Pin

1 (FB), is not short circuit protected. Shorting this pin to

ground or V_Swith a signal present on the amplifier may damage

it. Input signals should not drive Pin 1 (FB) directly; always use

the buffer amplifier to buffer input signals.

DUAL SUPPLY OPERATION

Figure 4 shows the AD694 operated in dual supply mode. (Note

that the pass transistor is shown for illustration and is not re-

quired for dual supply operation.) The device is powered com-

pletely by the positive supply which may be as low as 4.5 V. The

unique design of the output stage allows the I_OUTpin to extend

below common to a negative supply. The output stage can

source a current to a point 36 V below the positive supply. For

example, when operated with a 12.5 V supply, the AD694 can

source a current to a point as low as 23.5 V below common.

This feature can simplify the interface to dual supply DACs by

eliminating grounding and level-shifting problems while increas-

ing the load that the transmitter is able to drive. Note that the

DRIVING NONRESISTIVE LOADS

The AD694 is designed to be stable when driving resistive loads.

Adding a 0.01 µF capacitor from I_OUT(Pin 11) to Com (Pin 5),

as shown in Figure 3, ensures the stability of the AD694 when

driving inductive or poorly defined loads. This capacitor is rec-

ommended when there is any uncertainty as to the characteris-

tics of the load.

_OUTpin is the only pin that should be allowed to extend lower

than –0.3 V of common.

OPERATION WITH A PASS TRANSISTOR

The AD694 can operate as a stand-alone 4–20 mA converter

with no additional active components. However, provisions have

been made to connect I_OUTto the base of an external NPN pass

transistor as shown in Figure 4. This permits a majority of the

power dissipation to be moved off-chip to enhance performance

and extend the temperature range of operation. Note that the

positive output voltage compliance is reduced by approximately

0.7 V, the V_BEof the pass device. A 50 Ω resistor should be

added in series with the pass transistor collector, when the

AD694 is operated with dual supplies, as shown in Figure 4.

This will not reduce the voltage compliance of the output stage.

Figure 3. Capacitor Utilized When Driving Nonresistive

Loads; Protection Diodes Used When Driving Inductive

Loads

The external pass transistor selected should have a BV_CEO

greater than the intended supply voltage with a sufficient power

rating for continuous operation with 25 mA current at the sup-

ply voltage. F_Tshould be in the 10 MHz to 100 MHz range and

β should be greater than 10 at a 20 mA emitter current. Heat

sinking the external pass transistor is suggested.

Additional protection is recommended when driving inductive

loads. Figure 3 shows two protective diodes, D1 and D2, added

to protect against voltage spikes that may extend above V_Sor

below common that could damage the AD694. These diodes

should be used in addition to the 0.01 µF capacitor. When the

optional NPN transistor is used, the capacitor and diodes

should connect to the NPN emitter instead of Pin 11.

–6–

REV. B

1...3 4 567 8 9...16

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AD694JN	ADI	4.20 mA Transmitter	获取价格
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