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參數(shù)資料
| 型號(hào)： | AD694ARZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC TRANSMITTER 4-20MA 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
| 其它名稱： | AD694ARZ-REELDKR |
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AD694
–4–
REV. B
Typical Minimum Supply Voltage vs. Temperature for 2 V
and 10 V Full Scale
Maximum RL vs. Supply Voltage
Voltage Reference Power Supply Rejection
IOUT: Voltage Compliance vs. Temperature
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.
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
VS. 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 VS when the amplifier is operated as a follower.
The amplifier can source a maximum load of 5 k
, but can sink
only as much as its internal 10 k
pulldown resistor allows.
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 (VS). 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
). A3 forces the level
shifted signal across the 45
resistor to get a current gain of 20.
The transfer function of the V/I stage is therefore:
IV
R1
R2
OUT
PIN1
=×
+
()
20
/
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 IOUT pin 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 (VS). An
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參數(shù)描述 |
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| AD694BQ | 功能描述:IC TRANSMITTER 4-20MA 16-CDIP RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| AD694BR | 制造商:Analog Devices 功能描述:IC TRANSMITTER 4-20MA |
| AD694BR-REEL | 制造商:Analog Devices 功能描述:SP Amp INSTR Amp Single 36V 16-Pin SOIC W T/R |
| AD694BR-REEL7 | 制造商:Analog Devices 功能描述:SP Amp INSTR Amp Single 36V 16-Pin SOIC W T/R 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD694BRZ | 功能描述:IC TRANSMITTER 4-20MA 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
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