adc input driving ability

[shanmei]

The input signal of adc is always connected to cmos gate/ sampling capacitor, does it mean it has low driving ability, the input of adc is a high impedance driver?

Dose ADC signal input can still drive resistor load?

Thanks.

 

[erikl]

An input isn't a driver, it's a load. It has to be driven, usually by a driver impedance which is much lower than the input impedance.

You could say an input has low driving needs.