CDCBT1001: CDCBT1001 Application for 50ohm termination load

Youwei Lin

Part Number: CDCBT1001

Hi TI team,

We are using CDCBT1001 with VDD_OUT = 2.5V to drive a single-ended 10MHz clock at 50ohm load as picture below. Vout is (2.5)(34)/(34+50)=1.5V due to voltage divider and Iout is 2.5V/(34+50)=30mA which is below maximum continuous output current 50mA, but since datasheet does not list out the recommended operating condition for VDD_OUT=2.5V, we would like to know if this 30mA would cause damage to the device and shorten the device lifetime or it is acceptable for the device under this kind of operating conditon? BTW, Is there other recommended buffer IC that is able to drive a 50ohm load under recommended operating condition...?

Thanks,

5 months ago

0 Mike Yu 5 months ago

TI__Intellectual 2970 points

Hi Team,

Please kindly help on this. Thank you.

Best regards,

Mike

0 Michael Srinivasan 5 months ago in reply to Mike Yu

TI__Mastermind 19621 points

Hi all,

This operation is acceptable.

Thanks,

Michael

0 Mike Yu 5 months ago in reply to Michael Srinivasan

TI__Intellectual 2970 points

Hi Michael,

Thanks for your feedback!
Would you please check if my understanding below is correct or not?
Power dissipation of IC=(IDD_OUT)²(Rdriver)=(30mA)²(34ohm)=30.6mW
Using the Junction-to-ambient thermal resistance to calculate the temperature increase △T would be(30.6mW)(426.7C/W)=15.4C
If operating at the maximum recommended operating temperature 85C, the junction temperature of chip would be 85C+15.4C=100.4C which is below maximum junction temperature 150C, so it should be fine?

Best regards,

Mike

0 Michael Srinivasan 5 months ago in reply to Mike Yu

TI__Mastermind 19621 points

Hi Mike,

That should be fine.

Thanks,

Michael

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CDCBT1001: CDCBT1001 Application for 50ohm termination load