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Q&A [ADV7390] Abnormal sine pulses during Vertical blanking on NTSC output.

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[ADV7390] Abnormal sine pulses during Vertical blanking on NTSC output.

Tamu on Jan 7, 2021

Hi,

I have a question about ADV7390.

My customer uses ADV7390 for his project.
He can see abnormal waveforms during V blanking.

I summuized the question to attached file "Vblanikng_Waveform.xlsx".
Please refer it.

Thank you!
Best regards.
Tamu

Top Replies

PoornimaSubramani
Jan 11, 2021 +1
Hi,

Please make sure the source or the sync is inserting a noise spike into the system.

Could you please refer (ADV7390)Noise output from the device here expert give some suggestion about the noise output…
Tamu Jan 13, 2021 in reply to PoornimaSubramani +1 verified

Hi,

Thank you for your reply.
I had asked a same question in the past as follows..
https://ez.analog.com/video/f/q-a/7225/adv7390-the-input-digital-data-during-blanking-area-is-inserted-to-the-cvbs-output…

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0 PoornimaSubramani

on Jan 11, 2021 12:36 PM 10 months ago
Hi,

Please make sure the source or the sync is inserting a noise spike into the system.

Could you please refer (ADV7390)Noise output from the device here expert give some suggestion about the noise output from the ADV739x part

Thanks,

Poornima
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+1 Tamu on Jan 13, 2021 12:50 AM 10 months ago in reply to PoornimaSubramani

Hi,

Thank you for your reply.
I had asked a same question in the past as follows..
https://ez.analog.com/video/f/q-a/7225/adv7390-the-input-digital-data-during-blanking-area-is-inserted-to-the-cvbs-output/16955#16955
https://ez.analog.com/video/f/q-a/7169/encoding-range-of-adv7390/17233#17233

So, I close this thread.

Thank you!
Best regards.
Tamu
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+1 Tamu on Jan 13, 2021 12:50 AM 10 months ago in reply to PoornimaSubramani

Hi,

Thank you for your reply.
I had asked a same question in the past as follows..
https://ez.analog.com/video/f/q-a/7225/adv7390-the-input-digital-data-during-blanking-area-is-inserted-to-the-cvbs-output/16955#16955
https://ez.analog.com/video/f/q-a/7169/encoding-range-of-adv7390/17233#17233

So, I close this thread.

Thank you!
Best regards.
Tamu
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