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LMX2615-SP: Output default at power up

Steve Widener
Genius 11010 points
Part Number: LMX2615-SP
Other Parts Discussed in Thread: ADC12DJ5200RF

When the LMX2615-SP powers up, what is the state of the RFOUT outputs (pulled high, high Z?)

The concern is that the RFOUT is driving the input of an ADC (such as the ADC12DJ5200RF) CLK+/- prior to the ADC being powered up and exceeding the ABS max of the part. The ADC would power-up a few msec after the LMX2615 for instance.

  • +1
    TI__Guru** 107110 points

    Hi Steve,

    After Vcc power up, internal POR will reset all the registers to silicon default values. RFoutB is disabled while RFoutA is enabled. There is no signal output from RFoutA. RF output pins has external pull-up resistors and are AC-coupled to the receiver. So when Vcc is up, There will be a glitch after the DC blocking cap.