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AMC3330: Why we classify isolation amplifiers in this way?

Gordon Xu
Prodigy 440 points

Part Number: AMC3330
Other Parts Discussed in Thread: AMC3301, AMC1350, AMC1311

Hi experts,

Good day!

When my customer select the AMC series isolated amplifiers, they have some questions as below:

1. Why we classify the AMC3330 as a voltage sensing amplifier but AMC3301/3302 as a current sensing amplifier? just because the input voltage range is different?

2.Why did we divide AMC3301/3302 into ±250mV and ±50mV? What situation should I choose ±250mV or ±50mV?

3.They find the AMC3330 or AMC1350 is highlight the isolated AC voltage sensing, but they are confused that can't it be used for DC voltage sensing and AC/DC current sensing?

Many thanks!

BR,

Gordon

  • +1
    TI__Guru**** 183361 points

    Hi Gordon,

    Your first and second question can almost be answered the same way.  Consider power dissipation - higher voltage inputs are used for voltage sensing applications.  The power dissipation in the bottom resistor can be held at a relatively low value.  From there, your second question lets you get higher currents via the 50mV device without dissipating more power through the shunt.  For Q3, when the input range is +/-, there is no problem measuring an AC signal (voltage or current).  With a 0-2V input device like the AMC1311, the application would be for DC voltage - you could do AC, but you would need to bias the signal to ~1V to reach the full scale input range.