D
[email protected]
- Jan 1, 1970
- 0
Hello,
I am doing a project and one of the requirement is to measure
millivolt voltage signal, need 16-bit ADC. The actual input range is
below 100milivolt. If I choose a ADC with input range to 4V,
1LSB=0.06mV. Shall I just measure the input without any voltage
amplifier added in front of the ADC input pin?
Another requirement is another analog measurement, whose input
impedance is over 20MOhm. Can I just use a normal ADC chip connect to
that input without any other circuit? Or I need a very low bias
current OPamp to amplify the input signal, and have the voltage
amplifier's output connected to the ADC input.
Many thanks,
Regards
Jerry
I am doing a project and one of the requirement is to measure
millivolt voltage signal, need 16-bit ADC. The actual input range is
below 100milivolt. If I choose a ADC with input range to 4V,
1LSB=0.06mV. Shall I just measure the input without any voltage
amplifier added in front of the ADC input pin?
Another requirement is another analog measurement, whose input
impedance is over 20MOhm. Can I just use a normal ADC chip connect to
that input without any other circuit? Or I need a very low bias
current OPamp to amplify the input signal, and have the voltage
amplifier's output connected to the ADC input.
Many thanks,
Regards
Jerry