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| 型号： | AD693AQ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC TRANSMITTER 4-20MA 20-CDIP |
| 标准包装： | 18 |
| 类型： | 信号调节器 |
| 输入类型： | 电压 |
| 输出类型： | 电压 |
| 接口： | 3 线 |
| 电流 - 电源： | 20mA |
| 安装类型： | 通孔 |
| 封装/外壳： | 20-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 20-CDIP |
| 包装： | 管件 |
| 产品目录页面： | 798 (CN2011-ZH PDF) |
AD693
REV. A
–9–
Figure 15. Local Powered Operation with 0–20 mA Output
OPTIONAL INPUT FILTERING
Input filtering is recommended for all applications of the
AD693 due to its low input signal range. An RC filter network
at each input of the signal amplifier is sufficient, as shown in
Figure 16. In the case of a resistive signal source it may be
necessary only to add the capacitors, as shown in Figure 18.
The capacitors should be placed as close to the AD693 as
possible. The value of the filter resistors should be kept low to
minimize errors due to input bias current. Choose the 3 dB
point of the filter high enough so as not to compromise the
bandwidth of the desired signal. The RC time constant of the
filter should be matched to preserve the ac common-mode
rejection.
Figure 16. Optional Input Filtering
INTERFACING PLATINUM RTDS
The AD693 has been specially configured to accept inputs from
100
Platinum RTDs (Resistance Temperature Detectors).
Referring to Figure 17, the RTD and the temperature stable
100
resistor form a feedback network around the Auxiliary
Amplifier resulting in a noninverting gain of (1 + RT/100
),
where RT is the temperature dependent resistance of the RTD.
The noninverting input of the Auxiliary Amplifier (Pin 2) is
then driven by the 75 mV signal from the Voltage Divider (Pin
4). When the RTD is at 0, its 100
resistance results in an
amplifier gain of +2 causing VX to be 150 mV. The Signal
Amplifier compares this voltage to the 150 mV output (Pin 3) so
that zero differential signal results. As the temperature (and
therefore, the resistance) of the RTD increases, VX will likewise
increase according to the gain relationship. The difference
between this voltage and the zero degree value of 150 mV drives
the Signal Amp to modulate the loop current. The AD693 is
precalibrated such that the full 4-20mA output span corresponds
to a 0 to 104
°C range in the RTD. (This assumes the European
Standard of
α = 0.00385.) A total of 6 precalibrated ranges for
three-wire (or two-wire) RTDs are available using only the pin
strapping options as shown in Table I.
A variety of other temperature ranges can be realized by using
different application voltages. For example, loading the Voltage
Divider with a 1.5 k
resistor from Pin 3 to Pin 6 (common)
will approximately halve the original application voltages and
allow for a doubling of the range of resistance (and therefore,
temperature) required to fill the two standard spans. Likewise,
Table I. Precalibrated Temperature
Range Options Using a European
Standard 100
RTD and the AD693
Temperature
Range
Pin Connections
0 to + 104
°C
12 to 13
0 to +211
°C
12 to 13, and
15 to 16
+25
°C to +130°C 12 to 14
+51
°C to +266°C 12 to 14, and
15 to 16
–50
°C to +51°C
12 to 11
–100
°C to +104°C 12 to 11 and
15 to 16
Figure 17. 0-to-104
°C Direct Three-Wire 100 RTD lnterface, 4-20mA Output
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相关代理商/技术参数 |
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|---|---|
| AD693BQ | 制造商:AD 制造商全称:Analog Devices 功能描述:Loop-Powered 4a??20 mA Sensor Transmitter |
| AD694 | 制造商:AD 制造商全称:Analog Devices 功能描述:4.20 mA Transmitter |
| AD694_02 | 制造商:AD 制造商全称:Analog Devices 功能描述:4a??20 mA Transmitter |
| AD694AQ | 功能描述:IC SGNL COND 4-20MA TX 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 |
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