ADA Low Drift, Low Power Instrumentation Amp With Set Gains of 1 to FEATURES EASY TO USE Gain Set with One External Resistor (Gain Range to. ADA datasheet, ADA circuit, ADA data sheet: AD – Low Cost, Low Power Instrumentation Amplifier,alldatasheet, datasheet, Datasheet search site for. ADA Datasheet, ADA PDF, ADA Data sheet, ADA manual, ADA pdf, ADA, datenblatt, Electronics ADA, alldatasheet, free, datasheet.
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It seems that the gain is strongly dependent on the voltage of the reference pin. If I set the pot at precisely 2. But even slighly higher or lower and the gain reduces significantly.
ADA Datasheet, PDF – Alldatasheet
I’ve been taking measurements with a standard multimeter. I haven’t done meticulous testing with this, but none the less have lost a fair bit of hair. Is there something obviously wrong with what I’m doing? I must have run through the figures in the datasheet two dozen times. Is it the circuit at fault?
Notice the small block diagram in Fig. Notice that VREF is not a high impedance input.
In order not to skew the differential output stage, VREF should be connected to a low impedance output. A voltage divider by itself is not a low impedance output. However, the voltage divider can be buffered.
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I have built and tested a similar circuit. In my case, the VREF came a source other than a potentiometer, though.
I had connected the ref pin of an instrumentation amp straight to a potentiometer. It has interesting effects. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.