AD9650: Resistance and capacitance value for differential input configuration

Hi rahulpillai 

Thanks for your interest in AD9650.

For the Differential Capacitor, the value should be at least 5 pF to minimize sensitivity to parasitic capacitance and component variations. The addition of an external capacitor, in parallel with the ADC input helps absorb some of the transient charge and is small enough so that bandwidth is not compromised. (May need to increase to satisfy filter requirements). 

While for the Series Resistor, a 33 ohm with each input can help reduce the peak transient current required from the output stage of the driving source.

Hi rahulpillai 

Thanks for your interest in AD9650.

For the Differential Capacitor, the value should be at least 5 pF to minimize sensitivity to parasitic capacitance and component variations. The addition of an external capacitor, in parallel with the ADC input helps absorb some of the transient charge and is small enough so that bandwidth is not compromised. (May need to increase to satisfy filter requirements). 

While for the Series Resistor, a 33 ohm with each input can help reduce the peak transient current required from the output stage of the driving source.

Hi Jalipio,

Thank you for replying. Is there a way i can simulate the adc in a software before i go for hardware testing?

Please see Tools & Simulations at the product page: AD9650 Datasheet and Product Info | Analog Devices