TDC7201: about using TDC7201 as a phase detector

Vera Mao

Part Number: TDC7201

hi dear supporting team,

customer want to build up a PLL loop with TDC7201+DAC+AMP+OCXO, the interpretation of the phase gap to the control voltage is a hard section. do you have any reference design on this? for an example, if we get 1ns phase gap btw input clk and the loop back clk, how do we know how big voltage needed to generate from the DAC to control the OCXO? Tks a lot!

over 6 years ago

0 Bharat Aravamudhan over 6 years ago

TI__Genius 11015 points

Vera,

We do not have any app note/reference design that uses the TDC7201 as a PLL loop.

TDC7201 is essentially a Time-to-Digital Converter, which calculates the time between 2 sets of pulses. TDC performs the function of a stopwatch and measures the elapsed time (time-of-flight or TOF) between a START pulse and up to five STOP pulses.

So essentially it can help to count the time between input clk & loop back clock.

Please send me a quick block level diagram of the system that you plan to implement for further discussion.

0 Vera Mao over 6 years ago in reply to Bharat Aravamudhan

TI__Expert 5065 points

Hi Bharat,

I will send you by email. tks for support!

0 Bharat Aravamudhan over 6 years ago in reply to Vera Mao

TI__Genius 11015 points

Vera,

I will close this thread for now and I will respond to your email by this Friday.

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TDC7201: about using TDC7201 as a phase detector