Getting pixel data from the ADV7611 into a DAC

Hi,

We have just forwarded your question to the part specialist.

Best Regards,

Jeyasudha.M

It might be possible but you those parts will not insert the blanking and sync pulses into the analog output.  The best bet might be to post process the ADV7125 outputs to match the ADL5375 inputs. 

Also the ADV7611 would need to ouptut YCbCr 4:2:2

I am not exactly sure of your application so it is hard to make any real recommendations as to the best solution.

In addition to the last post:

the differential signals from the ADV7125 DAC I believe are 180 deg out of phase. The IQ modulator ADL5375 requires that the signals be 90 degrees between the I & Q inputs - so therefore the differential outputs of the DAC should be made to be in 90 degrees phase: this is one of the post processing that is referred in the last post by Guenter. You would also need to terminate the analogue outputs either IOR or IOB to ground using a suitable resistor since the ADL5375 requires 2 differential I and Q inputs. You would still need to hook up filters before the modulator to remove the Nyquist images.

Maybe you need to come up with a proper block diagram of your application-as this will help in understanding fully what you intend to carry out.

Depending on your application, could you perhaps use a mixer to upconvert the RGB data?

If you have to use the ADL5375, as edo mentioned, the I and Q inputs need to be in quadrature phase - 90 degrees apart, to get a single-side band output. Also, please keep in mind that the required common mode voltages on the ADL5375 is 0.5V for the ADL5375-05 and 1.5V for the ADL5375-15. Looking at the ADV7125 datasheet, it looks like the full scale current output can be adjusted by Rset. If Rset is set to 20mA, then it will set 0.5V with 50 ohm on source termination on ADV7125. Then it can interface to ADL5375-05 directly.

Please refer to "DAC MODULATOR INTERFACING" SECTION on page 24 of ADL5375 Datasheet.

I am going to insert a picture of what we are trying to accomplish.  Thank you.

!

I am not sure if these images are getting to you or not but here is picture of what we are trying to accomplish.

I am trying to get this image to you so you know what we are trying to accomplish.

HKumer:

This is a brand new design so I do not know what a mixer does.

You need more information before you can pick a solution

1) What format does the camera output.  This will define the bandwidth required by the RF link

2) What range does the RF link need.  This will define the transmit power

3) What frequency band are you planning to use.  This will define which modulation you can use.

4) Also you will need to check your power and frequency band to make sure it does not violate FCC rules

5) Any other special special requires you have that would eliminate you from using a Commercial off the Shelf (COTs) solution.

If the camera is NTSC format, multiple solutions already exist such as in security camera applications.

GuenterL:

The output from the Sony broadcast camera is 4K UHD through a HDMI cable.  The coding scheme is Sony's H.265 XAVC.

The output from the Panasonic broadcast camera is also 4K UHD through a HDMI cable.  The coding scheme is standard H.265.

Both also use a 3G SDI output cable that has be interfaced into our product also.

The range of the RF link is between a 3/4 and a full city block.  I designed my modulator with a 1W RF amplifier and my receiver with a LNA in the design.

We have a couple of frequencies to choose from.  We can go from 2.4GHz to 2.5GHz, or 3.3GHz to 3.9GHz or 4.9GHz to 5.875GHZ.

We have a FCC license for all three.

I hope that has answered all of your questions.

Please respond.

Randy Draper

RD Technologies

520-447-7078