Q I need to measure pulse current so I bought a few AD737 RMS to DC converters. I have a few questions about how to connect the IC. First: My power supply will be at 5 V. So what`s the max input voltage?? Second: I`ll measure the current through a current transformer. I`ve attacked the schematics. I`m sure I`m doing something wrong, but ... Can you give me a working schematics for measuring current with current trasformer or just help me to fix this? My application is working on 25kHz(the current I have to measure is on pulses). A I do have a couple of comments: 1. Pin-8 'COM' has to be connected to the half supply, same as pin 1. 2. By-pass caps are needed on the VCC, even if the 5V source is a battery or a regulator of some sort. 3. By-pass caps also needed on the LM324 pin-7 and pin-5. The AD737 bandwidth drops with input level, if the internal resistance of the current transformer is 50 Ohm this could mean low currents are expected. Consult the AD737 data sheet fig. 8; keep ein >10mV for accuracy. Attachments: schematics123.pdf

Q In Application Note AN-934 "60 dB Wide Dynamic Range, Low Frequency AGC Circuit" the circuit has output level flat over the audio frequency range of 20 Hz to 20 KHz. What changes are required in the circuit to get flat output level from 100 Hz to 25 KHz. A I believe the high-end frequency limitation in this circuit would be the rms-dc converter used for a detector and the low end would be the 10uF capacitor in the output. To set the low limit to 100Mz then the new capacitor value would be 1/100*6.28*RL where RL is the load resistance. To extend the response to 25kHz one could perform a measurement and see what the response is at 25kHz, if the response isn’t satisfactory, try an rms-dc with more BW like the AD636 or AD536A.

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AD7376 Production
The AD7376 is one of the few high voltage, high performance digital potentiometers on the market. This device can be used as a programmable resistor or...
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AD7371 Obsolete
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