I have a Question about IA AD524,
1- What does the protection dose in the Device and what is it made of?
2- Why there is 4 Op Amp in it not 2 Op-Amp as in a regular IA ?
3- What does Vb stand for?
We are looking into this and will provide a response as soon as possible.
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1. What does the protection dose in the Device and what is it made of?
-The protection on the input of the device provides a safeguard from excessive currents. The standard practice is to place a series resistor to each of the input to limit the current below 5mA, but this adds noise to the system. For the AD524, a FET was used to provide a bidirectional current limit holding a maximum of 3mA input current over 36V range.
2. Why there is 4 Op Amp in it not 2 Op-Amp as in a regular IA ?
-The other op amps inside the device are used for enhancing the performance of the input pre-amplifier for the fixed gains of 1,10,100 and 1000 without any external components. For gain settings between 1 and 1000, use a single resistor on the RG pins (pin 3 and pin 16) using the formula below.
Use, a precise and a low temperature coefficient resistor so that the effect on the gain accuracy and gain drift to the amplifier be minimal.
3. What does Vb stand for?
-Vb is an internal bias voltage
Hope this helps. If you have any clarifications let us know.
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