AD694JNZ

更新时间： 2024-01-13 06:16:23

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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AD694JNZ 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

AD694JNZ 数据手册

AD694

FUNCTIONAL DESCRIPTION

The operation of the AD694 can best be understood by dividing

the circuit into three functional parts (see Figure 1). First, a

single supply input amplifier buffers the high level, single-ended

input signal. The buffer amplifier drives the second section, a

voltage to current (V/I) converter, that makes a 0 to 16 mA sig-

nal dependent current.

Typical Minimum Supply Voltage vs. Temperature for 2 V

and 10 V Full Scale

Figure 1. Functional Block Diagram

The third section, a voltage reference and offset generator, is re-

sponsible for providing the 4 mA offset current signal.

BUFFER AMPLIFIER

The buffer amplifier is a single supply amplifier that may be

used as a unity gain buffer, an output amplifier for a current

output DAC, or as a gain block to amplify low level signals. The

amplifier’s PNP input stage has a common-mode range that ex-

tends from a few hundred mV below ground to within 2.5 V of

V_S. The Class A output of the amplifier appears at Pin 1 (FB).

The output range extends from about 1 mV above common to

within 2.5 V of V_Swhen the amplifier is operated as a follower.

The amplifier can source a maximum load of 5 kΩ, but can sink

only as much as its internal 10 kΩ pulldown resistor allows.

Maximum R_Lvs. Supply Voltage

Voltage Reference Power Supply Rejection

I_OUT: Voltage Compliance vs. Temperature

V/I CONVERTER

The ground referenced, input signal from the buffer amplifier is

converted to a 0 to 0.8 mA current by A2 and level shifted to

the positive supply. A current mirror then multiplies this signal

by a factor of 20 to make the signal current of 0 to 16 mA. This

technique allows the output stage to drive a load to within 2 V

of the positive supply (V_S). Amplifier A2 forces the voltage at

Pin 1 across resistors R1 and R2 by driving the Darlington tran-

sistor, Q2. The high gain Darlington transmits the resistor cur-

rent to its collector and to R3 (900 Ω). A3 forces the level

shifted signal across the 45 Ω resistor to get a current gain of 20.

The transfer function of the V/I stage is therefore:

I_OUT= 20 ×V_PIN1/ R1 + R2

(

)

resulting in a 0-16 mA output swing for a 0–10 V input. Tying

Pin 4 (2 V FS) to ground shorts out R2 and results in a 2 V

full-scale input for a 16 mA output span.

The output stage of the V/I converter is of a unique design that

allows the I_OUTpin to drive a load below the common (sub-

strate) potential of the device. The output transistor can always

drive a load to a point 36 V below the positive supply (V_S). An

–4–

REV. B

1 2 345 6 7...16

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