Thank you, I get it now.hi,
The Ch capacitor [Chold] has to charge to the voltage level of the source in order to get a correct ADC reading for the Vsource voltage.
If the Sample time is short and the Input resistance between the Vsource and Ch is 'high', the ADC reading will be low because the Ch will not fully charge to Vsource.
Does the ADC datasheet specify a maximal source impedance > 50 ohm. If not, you'll better use a buffer amplifier.
Yes but it's a AC voltage of 380 V because it's to sense the voltage of a 3 phase.you'll better use a buffer amplifier.
And what?Yes but it's a AC voltage of 380 V because it's to sense the voltage of a 3 phase.
No. You'll place a voltage divider in front of the buffer.You will not use an OP Amp as voltage follower at those voltages.
To measure mains AC voltages the MCU is probably earth-grounded or at least connected to neutral.
AC means the sine-wave goes negative and the TMS320F283xx A/D converter will not work with voltages below VSS_A even in differential-mode.
I don't see measurement of -ve voltages possible.
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