CDCM6208V1F: CDCM6208V1 has no output

Kailyn Chen

Part Number: CDCM6208V1F
Other Parts Discussed in Thread: CDCM6208V1

Dear,

Our customer used CDCM6208V1 and had no output if configured SEC_REF input.

In addition, if the channel 4/5 configured from SEC_REF input, there is output, but if configured from PLL input, there is no output.

The ELF pin is always 0V, it looks like the PLL didn't work. All the registers were wrote properly. The circuit is as following:

Best regards

Kailyn

over 6 years ago

0 Adam Siismets over 6 years ago

TI__Intellectual 950 points

Hi Kailyn,

Could you please send the register values or .tcs file used to program the part? This will help me with helping you through the issue.

Regards,

Adam

0 Kailyn Chen over 6 years ago in reply to Adam Siismets

TI__Genius 9560 points

Hello Adam，

Thank you very much for you reply, and this is the register configuration:

Best regards

Kailyn

0 Kailyn Chen over 6 years ago in reply to Kailyn Chen

TI__Genius 9560 points

Hello Adam,

Do you have any other updates？

Thank you very much.

Best regards

Kailyn

0 Adam Siismets over 6 years ago in reply to Kailyn Chen

TI__Intellectual 950 points

Hi Kailyn,

Has the customer done the proper modifications to the EVM in order to get the SEC_REF to work? As stated in the EVM user guide:

"If the SEC_REF is driven through the SMA connector, the on-board crystal and R72 and R73 must be removed and R87 must be populated with a 0-Ω resistor (R89 must also be populated with a 0-Ω resistor for a differential input signal)."

Regards,

Adam

0 Kailyn Chen over 6 years ago in reply to Adam Siismets

TI__Genius 9560 points

Hello Adam，

Thank you very much for your reply But the customer's circuit has no this problem, he has only one input which is SEC_REF and has no crystal input.

Do you have any other suggestions?

Best regards

Kailyn

0 Adam Siismets over 6 years ago in reply to Kailyn Chen

TI__Intellectual 950 points

Hi Kailyn,

I am still looking into this for you. Our labs and equipment are very tied up due to the current situation. I will respond with an update by the end of next week.

Regards,

Adam

0 Shawn Han over 6 years ago in reply to Kailyn Chen

TI__Genius 9920 points

1, Check SYNCN pin status

2, Check pin PDN ramping curve , refer to datasheet Figure 59.

Clock & timing

Clock & timing forum

CDCM6208V1F: CDCM6208V1 has no output