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AD9880 analog 2 input jitter


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 ?



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