CDCV304 / phase noise

Toshiyuki

Other Parts Discussed in Thread: CDCV304

Hi,

Our customer considers whether CDCV304 could meet the specification of FPGA CycloneV Transmitter REFCLK Phase Noise.CDCV304 data sheet shows 56fs[12kHz-20MHz] of rms jitter.

Could you give us the figure of frequency(Hz) vs phase noise(dBc/Hz) ?

Best Regards,

Kato

over 11 years ago

0 Gabe Ayala over 11 years ago

TI__Genius 10320 points

Hi Kato-san,

Our DS spec is for additive jitter of the CDCV304 buffer. The Phase noise of the output will be dependent on the reference signal provided.

Gabe

0 Toshiyuki over 11 years ago in reply to Gabe Ayala

Mastermind 7075 points

Hi Gabe -san,

Thank you for the reply. I understood the phase noise of the output is dependent on the reference signal provided.

However, the competitor LTC6957 DS shows the figure of frequency(Hz) vs phase noise(dBc/Hz).

Please let me know the information.

Best Regards,

Kato

0 Toshiyuki over 11 years ago in reply to Toshiyuki

Mastermind 7075 points

Gabe - san,

I haven't got your answer yet.

Could you please tell us the information ?

Best Regards,

Kato

0 Gabe Ayala over 11 years ago in reply to Toshiyuki

TI__Genius 10320 points

Hi Kato-san,

Here is information for a specific input configuration

CDCV304 Phase Noise (dBc/Hz) for 20 MHz carrier

Offset	Input	Output
1 kHz	-154.21	-143
10 kHz	-157.318	-150
100 kHz	-158.85	-154
1 MHz	-158.35	-156
IBW (12 kHz to 20 MHz)	286.61 fs RMS	350 fs RMS

Gabe

0 Toshiyuki over 11 years ago in reply to Gabe Ayala

Mastermind 7075 points

Gabe -san,

Thank you for your information. In addition, could you give us phase noise (dBc/Hz) data for 125MHz carrier ?

Best Regards,

Kato

0 Toshiyuki over 11 years ago in reply to Toshiyuki

Mastermind 7075 points

Gabe - san,

Please let me know if we are able to get phase noise(dBc/Hz) datat for 125MHz carrier.

I look forward to hearing from you soon.

Best Regards,

Kato

0 Gabe Ayala over 11 years ago in reply to Toshiyuki

TI__Genius 10320 points

Hi Kato-san,

We do not have this information readily available. I will look and see if we have more information, but this will take time.

Gabe

0 Gabe Ayala over 11 years ago in reply to Toshiyuki

TI__Genius 10320 points

Hi Kato-san,

We are working on collecting this data for you. Thank you for your patience.

Gabe

0 Gabe Ayala over 11 years ago in reply to Toshiyuki

TI__Genius 10320 points

Hi Kato-san,

See PN plot of the frequency output for 125 MHz carrier.

Input Jitter (12 kHz to 20 MHz IBW) 77 fs RMS

Output Jitter (12 kHz to 20 MHz IBW) 95 fs RMS

Total additive Jitter 56.20 fs RMS

Gabe

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CDCV304 / phase noise