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| 型号： | AD694ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC TRANSMITTER 4-20MA 16-SOIC |
| 标准包装： | 47 |
| 类型： | 电流发送器 |
| 输入类型： | 电压 |
| 输出类型： | 电压 |
| 电流 - 电源： | 23mA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 管件 |
| 产品目录页面： | 798 (CN2011-ZH PDF) |
AD694
REV. B
–11–
Figure 13. Digital to 4–20 mA Interface Using a Current Steering DAC
Figure 14. Single-Supply Digital Input to 4–20 mA Output
code dependent, and the response time of the circuit will be de-
termined by the reaction of the voltage reference. The supply
voltage to the AD7541A should be kept close to 15 V. If VS is
reduced significantly from 15 V the differential nonlinearity of
the DAC will increase and the linearity will be degraded.
In some applications it is desirable to have some underrange and
overrange in the 4–20 mA output. For example, assume an over
and under range capability of
±5% of span is needed, then the
output current range corresponding to the full scale of the DAC
is 3.2 mA to 20.8 mA. To accomplish this, the span of the
AD694 would be increased 10% to 17.6 mA by adding a nonin-
verting gain of 1.1 to the buffer amplifier. The 4 mA offset
would then be reduced by 0.8 mA, by utilizing the adjustment
scheme explained in Adjusting 4 mA Zero section. Then a digi-
tal input from all zero code to full scale would result in an out-
put current of 3.2 mA to 20.8 mA.
LOW COST SENSOR TRANSMITTER
Sensor bridges typically output differential signals in the 10 mV
to 100 mV full-scale range. With an AD694, a dual op amp, and
some resistors, an instrumentation amplifier front end can be
added which easily handles these types of low level signals.
The traditional 3 op amp instrumentation amplifier is built us-
ing an AD708 dual op amp for the front end, and the AD694’s
buffer amplifier is used for the subtractor circuit, as shown in
Figure 15. The AD694’s 2 V reference is used to provide a
“ground” of 2 V that ensures proper operation of the in amp
over a wide common mode range. The reference pin of the
subtractor circuit is tied to the 2 V reference (point C). A 2 k
pull-down resistor ensures that the voltage reference will be able
to sink any subtractor current. The 2 V FS (Pin 4) is attached to
the 2 V reference; this offsets the input range of the V/I con-
verter 2 volts positive, to match the “ground” of the in amp.
The AD694 will now output a 4–20 mA output current for a
0 V to 2 V differential swing across VA. The gain of the in amp
front end is adjusted so that the desired full-scale input signal at
VIN results in a VA of 2 V. For example a sensor that has a 100
mV full scale will require a gain of 20 in the front end. The gain
is determined according to the equation:
G = [2RS/Rg] + 1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD694ARZ-REEL | 功能描述:IC TRANSMITTER 4-20MA 16SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:* 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
| AD694BQ | 功能描述:IC TRANSMITTER 4-20MA 16-CDIP RoHS:否 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装: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 |
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