Using ADV7850 without External DDR or EDID memory

Question

We need to convert an DVI-A (analog HD) signal to a digital format for feeding an FPGA. Most convenient would have been MIPI-CSI, but since I couldn't find a chip for that, I see that the ADV7850 can convert to HDMI, that we can feed the FPGA instead. However, we don't need the comb filter or any processing on the analog signal. Can we use the ADV7850 without the DDR memory and simply leave the DDR interface pins on the ADV7850 unconnected? 
 Or, am I wrong and that there is a part I overlooked that can convert DVI-A (analog HD) to MIPI-CSI? 
 Thanks 
 -ron

PoornimaSubramani · Accepted Answer

Hi, 
 There is a part I overlooked that can convert DVI-A (analog HD) to MIPI-CSI? 
 ADV7481/ADV7482 can convert Analog to MIPI-CSI. 
 The ADV7850 requires DDR if the SDP module is used and in this application CVBS is present so DDR is required. 
 Note: Using ADV7844/ADV7842 solution the external DDR can be dropped if 3D Comb and TCB features are dropped. Note ADV7844 has 4 HDMI inputs where the ADV7842 has only 2.Please refer here https://ez.analog.com/video/f/q-a/106101/cvbs-to-hdmi-conversion/321598#321598 
 
 Thanks, 
 Poornima)

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Using ADV7850 without External DDR or EDID memory