AD9082 : specification clarification

Hello,

Answers to you questions are as follows:

1) AD9082 has two ADC's with max 6 GSPS operation while the AD9081 has four ADC with max 4 GSPS operation.
2) The AD9081 and AD9082 can be configured for complex inputs/output applications as is the case for "zero-IF" or "complex-IF" applications where a quadrature demodulator/modulator is used to interface to a dual ADC/DAC.  The DDC/DUC can still be used as would be the case for a "complex-IF" application.

3) Observation Rx pertains to Transmit Digital Pre-distortion applications where the PA output is fed back to an ADC input (after some attenuation) such that the quality of the transmit signal can be observed with digital pre-distortion coefficients modified to maintain sufficient linearity performance.

4) ADC's can used as 4 independent channels.  This is the case in direct RF applications where each ADC input would have its own antenna.  In this sort of application the digital data path is also used to down-convert the desired RF bands to a digital zero-IF signal.


In the case of the AD9081 and AD9082, one can completely bypass the digital data path such that ADC's operate in Nyquist Mode allowing for maximum signal bandwidth capability.