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SA602, SA605 LO base pin voltage

Question asked by Matt findlow on May 12, 2017
Latest reply on May 16, 2017 by Matt findlow

Hi, for SA602 and SA605, what DC bias voltage can I expect at the base of the LO when Vcc is 5V?   I have mounted both the 605 and 602 on soic break out boards.  I have no other components in the circuit, just 5V to Vcc and GND connected.  I measure 4.97V at the base, virtually Vcc.  Doesn't seem like an appropriate bias voltage to me. Correct me if I'm wrong.  What voltage should I expect to see?  The SA636 data sheet has a chart of expected voltages for all its pins and its LO base is 2.3V when Vcc is 3V.