The ADL5387 quad demodulator is rated from 50MHz to 2GHz. Can this part be operated down to 30Mhz and what performance issues can I expect?
The minimum frequency of the ADL5387 is 50 MHz. Operation below this minumum frequency will no longer guarantee the performance as specified on the datasheet. The product line does not test nor characterize below this frequency.
While opereation was not tested below 50 MHz, reasonable perfrmance can still be obtained down to MHz by the use of a square wave for the 2x frequency external LO signal, to satisfy the input divider's slew-rate requirements. The part is internally dc-coupled, so quadrature and conversion gain should hold up even at low frequencies.
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