DAC38RF80: What to do with CLKTX+- (Pin no.-A7 and A6) when not using

LALIT VERMA

Expert 1695 points

Part Number: DAC38RF80

Hi TI,

We are not going to use the CLKTX+- pins in our design.

So what to do with these pins?

Do we need to terminate them or can we left them floating?

Thanks,

Lalit

over 6 years ago

0 Ebenezer Dwobeng over 6 years ago

TI__Genius 9695 points

Hi Lalit,

These pins have internal termination. It is safe to leave them floating.

Thanks,

Eben.

0 LALIT VERMA over 6 years ago in reply to Ebenezer Dwobeng

Expert 1695 points

Hi Eben,

Thanks for the reply.

Can we configure this output as single ended output?

What will be the connections for configuring CLKTX+- in single ended output mode?

Thanks,

Lalit

0 LALIT VERMA over 6 years ago in reply to LALIT VERMA

Expert 1695 points

Hi Eben,

Any update on the single ended mode operation of CLKTX+- pins of DAC38RF80?

Thanks,

Lalit

0 Ebenezer Dwobeng over 6 years ago in reply to LALIT VERMA

TI__Genius 9695 points

Hi Lalit,

You can AC couple to the single ended clock input and connect a clock driver that has swing of 800mVpp or higher.

Note that the device characterization data in the datasheet is performed with the differential clock input. The single ended clock input has only been tested for functionality.

Thanks,

Eben.

0 LALIT VERMA over 6 years ago in reply to Ebenezer Dwobeng

Expert 1695 points

Hi Eben,

Do I need to connect the CLKTXP and CLKTXN pins as per the below diagram for avoiding mismatch at CLKTXP and CLKTXN pins or I could leave the CLKTXN pin floating?

Thanks,

Lalit

0 LALIT VERMA over 6 years ago in reply to LALIT VERMA

Expert 1695 points

Hi Eben,

Please update on this.

Thanks,

Lalit

0 Ebenezer Dwobeng over 6 years ago in reply to LALIT VERMA

TI__Genius 9695 points

Hi Lalit,

There is a single ended clock input that you can use: pin A12

Its ok to leave the differential clock pins floating if they are not used as they are internally terminated.

Thanks,

Eben.

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DAC38RF80: What to do with CLKTX+- (Pin no.-A7 and A6) when not using