AnsweredAssumed Answered

(Video decoder)When inputting full differential, is the network resistance really 150 ohm?

Question asked by donadona999s on Apr 18, 2018
Latest reply on Apr 30, 2018 by donadona999s

Hi!

 

I have some question about ADI Video decoder.

Our customer are planing to use ADV728xA-M for automotive rear camera.

Our customer are TIER1 and OEM said that output impedance will be 75Ohm differential and the amplitude will be 1Vpp-Diff.

* I am confirming this to my customer and OEM.

 

I wrote a simple picture.

I asked about network resistor many time.

(Video decoder)Full differential connect 

But I want make sure.

 

Q1)

If our customer use 75Ohm differential CVBS source, should they use 75Ohm for R1?

Our should they use 150Ohm?

If they should use 150Ohm I think impedance matching is not secure so please tell us why we have to chose 150Ohm.

 

Q2)

Our customer is planing to use ADV728xA-M.

But I also saw the ADV 7182 data sheet for reference information.

At ADV7182 datasheet p13, it say us to use 150Ohm for Full-differential.

But at datasheet P31, it says us to use 75Ohm.

Which is correct?

If 150Ohm is correct, why figure 24 shows us to use 75Ohm?

 

Best regards

Kawa

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