Tool/software:
Hi,
We are currently evaluating AMC1351 as a potential replacement for the Si8931 (Skyworks) for isolated voltage sensing applications.
While reviewing the AMC1351 datasheet and the typical application circuit (see below diagram), we have the following questions:
Q1. Regarding Gain and Output Behavior of AMC1351
Although the datasheet states that the gain of AMC1351 is 0.4 V/V, the example below shows that an input of 0–5V at the IN pin results in a 2V differential output (OUTP – OUTN).
This seems inconsistent at first glance, so we would appreciate clarification on the following points:
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Does the gain of 0.4 V/V refer only to the differential output (OUTP – OUTN)?
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In this configuration, are OUTP and OUTN always swinging symmetrically around a fixed common-mode voltage (VCMout ≈ 2.5V)?
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If OUTP − OUTN = 2V when IN = 5V, does this mean OUTP ≈ 3.5V and OUTN ≈ 1.5V?
Q2. Recommended Alternatives to Si8931
Since Si8931 features a 1× analog gain and single-ended output, are there other TI products (besides AMC1351) you would recommend that closely match these characteristics?
Key features we are looking for:
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Reinforced isolation
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Analog output
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Gain = 1 V/V (or close)
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Single-ended output (for easier ADC interfacing)
Any suggestions for drop-in or functional replacements would be greatly appreciated.
Thanks,
Conor
