AD9650: Resistance and capacitance value for differential input configuration

Question

Hello, 
 I would like to now the differential input resistance and capacitance value for AD9650 of Fig.82. I don&rsquo;t find them in the datasheet.

JAlipio · Accepted Answer

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.)

JAlipio · Answer

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

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AD9650: Resistance and capacitance value for differential input configuration