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Interfacing external clock.

Question asked by Manas@98 on Dec 2, 2017
Latest reply on Dec 4, 2017 by sripad

Interfacing external clock.

 

Hi,

I want to use external reference clock of 40MHZ sine wave.I gave it to the ref_clk on the ad9361 chip.

in ad9361 default init parameters(in main.c) i changed the following quantitties:

1) xo_disable_use_ext_refclk_enable to 1.

Will the Mux in reference scaler will automatically selects the external ref clock because of above statement.

I want the LO frequencies to be generated using this reference clock

should i need to change  (external_rx_lo_enable, external_tx_lo_enable)?

 

What are the other parameters i need to change? please help.

I set 400MHz as the lo frquency and BW of 10MHZ.

without ( xo_disable_use_ext_refclk_enable to 1.) iam able to see the output .

Once i keep the above statement i am getting calibration error

Calibration TIMEOUT (0x5E, 0x80)

Calibration TIMEOUT (0x244, 0x80)

ad9361_init : AD936x initialization error.

What are things i need to do for making it work with external ref clock

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