I'm evaluating a design for digitizing 500MHz of bandwidth starting from near zero (let's say from 100Hz).
I want to use ADRF6820 quad demodulator (moving from L-band to near-zero) paired with AD9680 ADC.
I'm thinking about using ADL5205 diffDGA to drive AD9680. AS AD9680 provide diff outputs for I and Q components, i want to keep all signal chains differential down to ADC.
Datasheet specs for ADL5205 starts from 10Mhz so i need to know it's low frequency performance.
Does it depend on input decoupling capacitors only or there are some other limitations?
Thanks for your attention,