ADV7619 Audio LRCLK jitter

Question

HI, 
 I would like to know the maximum jitter I should expect on the LRCLK output of the ADV7619 if the HDMI source is compliant with the spec? I guess the internal audio PLL as non negligeable impact on audio jitter. 
 Thanks, 
 Denis Alain, Eng.

PoornimaSubramani · Accepted Answer

Hi, 
 I would like to know the maximum jitter I should expect on the LRCLK output of the ADV7619 if the HDMI source is compliant with the spec? 
 ADV7619 derives its audio clocks from the TMDS clock embedded in the HDMI input and any jitter present in the HDMI source's TMDS clock can propagate to the LRCLK output. 
 Total jitter on the LRCLK output is influenced by both the incoming HDMI signal and the internal PLL&rsquo;s behavior. If the source is clean and the PLL is locked properly, the resulting jitter should stay within 100 ps peak-to-peak . 
 For a compliant HDMI source, the maximum jitter on the LRCLK output from the ADV7619 should be expected to be less than 100 ps peak-to-peak . However, the internal PLL&rsquo;s characteristics can introduce small jitter, possibly increasing the jitter to 100 ps or slightly higher under certain conditions, but this should still be within the acceptable limits for most audio applications. 
 
 I guess the internal audio PLL as non negligeable impact on audio jitter. 
 
 PLL&rsquo;s jitter is typically very low, but still non-negligible. 
 For high-quality audio applications, this jitter could typically be in the range of 50 ps to 100 ps peak-to-peak, depending on the specific configuration, input signal quality, and operating conditions.
 
 Note: 
 
 According to the HDMI specification, the jitter on the TMDS clock should typically be below 100 ps (picoseconds) peak-to-peak, which is the key input clock from the HDMI source. 
 If the HDMI source adheres to the HDMI spec, it ensures that the base clock signal is clean, with minimal jitter.

Thanks, 
 Poornima)

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ADV7619 Audio LRCLK jitter