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Interfacing the AD9136 and ADRF6780

Question asked by KeithClark on Apr 20, 2018
Latest reply on Jul 19, 2018 by landsman


We intend using the AD9136 dual DAC to feed the ADRF6780 modulator via a differential filter with a base band signal to get an RF output directly at 8 GHz.

I have two questions:-

1). If using the base band I/P's on the ADRF6780 how are the IF ports terminated? Are they left floating or terminated in 50 Ohms?

2). The AD9136 has a compliance voltage of -250mV to +750mV and the ADRF6780 requires an input offset voltage of 0.5 volts. Is there a recommended way of interfacing these two opposing requirements whilst maintaining the best DAC resolution? I guess there are passive or transformer options available?

Many thanks for your hep

Best regards