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Original question:

LMK01801 LVPECL CLOCK OUT TERMINATION CLARIFICATION

LMK01801: No clock outputs

Antony Jerocin
Prodigy 10 points
Part Number: LMK01801

Hi ,

I am using LMK01801 in my design, For the clock distribution purpose .with the following operating conditions:

Input: RF sine wave single ended 

Input frequency : 2.7GHz

Clock Output 0 : 2.7GHz with output division of one.

Clock Output 4 : 1.35GHz GHz with input division of two.

Mode of controlling: PIN mode/Uwire

Based on my operating conditions ,i have initially tried with pin controlled mode with following configurations,

1.TEST/CLKOUTTYPE_0          ::High

2.SYNC0/CLKOUTTYPE_1       ::High

3.CLKUWIRE/CLKOUTDIV_1    :: High

4.DATAUWIRE/CLKOUTDIV_0  :: Low

5.EN_PIN_CTRL                        ::Low

With this i haven't got any clock outputs.Then i changed into uWire configuration to reflect the same still i am not getting any clock outputs.

My query is ,

1.When we are using pin control mode what should be state of uWire lines (LEUWIRE/CLKOUTDIV_2,SYNC1/CLKOUTTYPE_2) ?

2.Why there is no toggling for low frequency ,i have changed the input to 100MHz from Signal generator which is single ended ,still there is no clock outputs/Kindly clarify the same ASAP.