we have been using the AD9880 on our products for many years.
We always had a crystal clear picture on the Analog #0 input.
Recently, we started using the analog #1 input for a new custom product.
We have discovered that the PLL seems to be less stable on the analog #1.
For example, a 720p60 signal shows some jitter in the acquisition but if we use a 720p75 signal, it is very stable.
For the 720p60 signal, we use a VCO value of 18 or 20 (pixel clock ~74MHz).
For the 720p75 signal, we use a VCO value of 24 (pixel clock ~96 MHz).
Any ideas ?