Enabling PLL stop video conversion to CVBS

Question

We are using ADV7393 to convert digital video stream from DPI to CVBS. 
 The input video on DPI is SD video stream 720x480 resolution BT656 video standard and 10 DPI data pin connected. 
 
 We use the next config to enable video stream: 
 ## Use example Table 82. 8-Bit 625i YCrCb In (EAV/SAV), CVBS/Y-C Out but with adjustmen for 10 bits
i2cset -y 1 0x2a 0x17 0x02 # Software reset.
i2cset -y 1 0x2a 0x82 0xC3 # SD PrPb SSAF filter + SD DAC Output 1 (Enable CVBS) + Data Valid
i2cset -y 1 0x2a 0x88 0x10 # 10-bit input enabled.
 
 The problem is that when we enable PLL with the ebove config using the next command, the video stream conversion stops: 
 i2cset -y 1 0x2a 0x00 0x10 # DAC1 + PLL enable
# Setting 0x00 register value to 0x10

What prerequisites or extra steps do we need to make to enable PLL x16?

VarshiniK · Accepted Answer

Hi, 
 The ADV739x PLL only provides the oversampling clock. Other then this the output is strictly based on your 27MHz incoming clock. 
 on the ADV739x output, is the color burst stable and the right amplitude. 
 can you attach a ntsc image with color problems? 
 For ADV7393 are the EXT_LF components close to the part and the reference PVDD_1.8V supply very clean, especially when running ntsc? 
 Normally these issues are related to poor color burst qualities and/or instability in the final NTSC signal. 
 Thanks, 
 Varshini K)

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Enabling PLL stop video conversion to CVBS