DEVOSC oscillator

Madhura Shetty

Hi,

We are using 1.8V LVCMOS compatible oscillator for DEVOSC and AUXOSC input of DM8148. Why inverter needs to be connected at the oscillator output.

Regards

Madhura

over 10 years ago

0 Pavel Botev over 10 years ago

TI__Guru**** 170625 points

Madhura,

I think this external inverter/buffer is not necessary, still your clock source must meet the DEVOSC_MXI/DEV_CLKIN/AUXOSC_MXI/AUX_CLKIN timing requirements.

Regards,
Pavel

0 Madhura Shetty over 10 years ago in reply to Pavel Botev

Intellectual 810 points

Hi Pavel,

Thanks for your reply.

Oscillator has been selected by considering the timing requirements given in datasheet. but in datasheet of DM8148 section 7.4.1.2
(Figure 7-9,Figure 7-10) a inverter has been used. My concern is if the inverter is not used will the design work? Why it has been used in there?

Regards

Madhura

0 Pavel Botev over 10 years ago in reply to Madhura Shetty

TI__Guru**** 170625 points

Hi Madhura,

If your external clock source meet the timing requirements, I think it should work fine without inverter. The inverter was shown in this figures by the reason this is external clock source, it is used for better schematic view, to highlight that this is external clock source.

Regards,
Pavel

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DEVOSC oscillator