Tool/software:
Hello,
I have a few questions about the ADS127L21.
1) Was it written in the evaluation board datasheet and the ADS127L21 datasheet that internal clock is not recommended for AC voltage measurement. But we tested it with the evaluation board using a unipolar signal of 500mV AC with a 1.65V DC offset. we readed this signal. In what situations is this expression valid for AC voltage. When measuring a 1.65VDC offset and a 500mVAC signal, would we encounter any unexpected ADC AC voltge measurement with internal clock.
2) Do we need to measure the clock when applying an external clock to the ADC? Do SCLK and the external clock need to be synchronized? Because the datasheet states the following: 'Minimize phase skew between SCLK and CLK (< 5ns)'. I didn't fully understand this statement, what is the reason for it?
I would appreciate a quick reply.
thank you