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AMP04FP Datasheet(PDF) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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AMP04FP Datasheet(HTML) 11 Page - AVAGO TECHNOLOGIES LIMITED |
11 / 16 page AMP04 REV. B –11– 4-20 mA Loop Receiver At the receiving end of a 4-20 mA loop, the AMP04 makes a convenient differential receiver to convert the current back to a usable voltage (Figure 13). The 4-20 mA signal current passes through a 100 Ω sense resistor. The voltage drop is differentially amplified by the AMP04. The 4 mA offset is removed by the offset correction circuit. AMP04 1k 3 2 4 6 VOUT 7 +15V –15V 100 1% 1N4002 WIRE RESISTANCE 1k 4–20mA 4–20mA TRANSMITTER 100k POWER SUPPLY 0.15 F 4–20mA 0–1.6V FS 5 8 1 OP177 2 3 AD589 –15V 6 27k 10k –0.400V Figure 13. 4-to-20 mA Line Receiver Low Power, Pulsed Load-Cell Amplifier Figure 14 shows a 350 Ω load cell that is pulsed with a low duty cycle to conserve power. The OP295’s rail-to-rail output capa- bility allows a maximum voltage of 10 volts to be applied to the bridge. The bridge voltage is selectively pulsed on when a mea- surement is made. A negative-going pulse lasting 200 ms should be applied to the MEASURE input. The long pulsewidth is necessary to allow ample settling time for the long time constant of the low-pass filter around the AMP04. A much faster settling time can be achieved by omitting the filter capacitor. AMP04 3 2 VOUT 7 6 IN GND OUT REF01 1/2 OP295 MEASURE 1N4148 10k 1k 50k 12V 5 4 330 0.22 F 8 1 2N3904 12V 350 Figure 14. Pulsed Load Cell Bridge Amplifier Single Supply Programmable Gain Instrumentation Amplifier Combining with the single supply ADG221 quad analog switch, the AMP04 makes a useful programmable gain amplifier that can handle input and output signals at zero volts. Figure 15 shows the implementation. A logic low input to any of the gain control ports will cause the gain to change by shorting a gain- set resistor across AMP04’s Pins 1 and 8. Trimming is required at higher gains to improve accuracy because the switch ON- resistance becomes a more significant part of the gain-set resistance. The gain of 500 setting has two switches connected in parallel to reduce the switch resistance. 8 7 6 5 1 2 3 4 V– REF V+ RG RG AMP04 ADG221 13 10 9 7 8 15 16 2 1 12 5V TO 30V VOUT 0.22 F 5 4 11 6 14 3 715 10.9k 200 200 0.1 F 10 F 5V TO 30V GAIN OF 500 GAIN OF 100 GAIN OF 10 WR GAIN CONTROL 0.1 F INPUT 100k Figure 15. Single Supply Programmable Gain Instrumen- tation Amplifier The switch ON resistance is lower if the supply voltage is 12 volts or higher. Additionally, the overall amplifier’s temperature coeffi- cient also improves with higher supply voltage. |
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