I am a beginer in microcontrollers understanding, and also I am new on
this forum, so HI all. I have some questions about a few problems :
1. A Sample and Hold circuit is connected to a signal of source
resistance 2Kohms. Its outputs is connected in turn to an ADC. The
Sample and Hold capacitor is 90pF.
What aquisition time should be allowed if 10-bit resolution is required
by the ADC ?
I know that time constant is RC. For this case I obtained 0,18 microsec.
2. A 16F873A microcontroller is operating from a supply of 4V and a
clock frequency of 1MHz. The ADC is used (a 10-bit ADC module), but only
8-bit accuracy is required. The signal source resistance is 5Kohms.
Estimate the acquisition time required.
What is the fastest conversion time that is available, assuming each
conversion is allowed to run to completion ?
Hence estimate the maximum sampling rate possible.
3. Given a sinusoid with 500Hz frequency, what should be the minimum
sampling frequency for analog-to-digital converter if we want to
faithfully reconstruct tha analog signal after the conversion ?
Please help me.