TDC1000: TDC1000 COMPIN

Ritvik Arora

Prodigy 20 points

Part Number: TDC1000

Hi,

What is the maximum amplitude(pk to pk) of an echo or rf which the COMPIN pin can receive ??

Kindly reply ASAP.

Regards,

Ritvik

13 days ago

0 Eddie LaCost 12 days ago

TI__Mastermind 44795 points

Hello Ritvik,

I don't see that explicitly specified in the datasheet. Most applications will feed the output of the PGA into COMPIN, so we can surmise that the max output voltage of the PGA would also be a safe level for the input of the comparator. This is specified below.

Let me know if you have questions.

0 Ritvik Arora 12 days ago

Prodigy 20 points

Hello Eddie,

Thank you for the response.

Is it possible that I give my RF signal directly to the COMPIN pin instead of the Rx pin. Also, if I have set the PGA to max gain i.e. 21dB I don't see my RF signal getting amplified enough i.e. a total of 41dB considering both LNA and PGA are active.

Thanks

0 Eddie LaCost 11 days ago in reply to Ritvik Arora

TI__Mastermind 44795 points

Ritvik,

Yes, you can feed your signal directly to COMPIN pin if you already have a large enough signal level and don't require the LNA or PGA. See the receiver section of the datasheet below.

0 Ritvik Arora 11 days ago in reply to Eddie LaCost

Prodigy 20 points

Hello Eddie,

Thanks for your reply.

I am connecting my RF signal directly to the COMPIN pin instead of my RX pin, but the IC is unable to generate any STOP pulse. Kindly let me know if you need any schematic images or images of the RF signal which we are seeing on the Oscilloscope, Kindly reply ASAP.

Thanks

0 Eddie LaCost 10 days ago in reply to Ritvik Arora

TI__Mastermind 44795 points

Yes, can you please provide scope captures of the signal on the COMIN pin?

0 Ritvik Arora 10 days ago in reply to Eddie LaCost

Prodigy 20 points

So this is the signal which I am connecting directly to my COMPIN pin I have not connected anything to my RX pin(therefore I am not using either amplifier) .

So now I am unable to generate any STOP pulse is it because I am not connecting anything to my RX pin because as far as I have read the STOP pulse is generated using the signal on the COMPIN pin it has nothing to do with the RX pin.

Kindly let me know how I should proceed.

Thanks.