[time-nuts] 74HCT9046A Max. Operating Frequency

Tim Shoppa tshoppa at gmail.com
Tue Apr 29 06:36:29 EDT 2014


Wow, 150PPM typical/100PPM guranteed is pretty big pull range for VCXO.
Wonder if they use a special cut to get that much. One trick I've seen is
to parallel crystals to increase pull range.

I have used PS2 from 74HCT9046 up to 1.0-2.5 MHz with no problems so you
will have no difficulty at the word rate.



On Tue, Apr 29, 2014 at 3:17 AM, sg sg <micpreamp at yahoo.de> wrote:

> Thanks again for the further discussion.
>
> This is not for studio use, I'm designing a one-off AES-to-I2S interface
> for evaluation of DA converter chips. The PLL provides a very low jitter
> master clock such that the conversion jitter is, for jitter frequencies
> down to some Hz, dominated by the VCXO and converter. The pulling range of
> the VCXO is something like +-150 ppm (spec'd for +-100 ppm) and fully
> sufficient for this application (the source is a high-performance audio
> analyzer).
>
> It is still not fully clear to me if there is some reasonably well defined
> upper limit for the operation of the PS2 in the '9046, but I take it that
> it is more appropriate to use the word rate (48-192 kHz) for the PLL.
>
> Samuel
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