LMK05318B: Schematic ping setup

Zain Alishammat

Part Number: LMK05318B

Tool/software:

Hello,

i want to use LMK05318B in a custom circuitry. I just want to use output 7 and 4.

Should i even though enable the output power (VDDO_x) of the others output pins? Other words could i left these pins floating?

Zain

7 months ago

0 Octo Halsema 7 months ago

Intellectual 321 points

Hi Zain,

Yes, power all the VDDO_x pins when using this LMK.
To minimize power consumption power down unused blocks through registers.

Although, unused clock inputs and outputs can be left floating.

For more details see LMK05318B datasheet 10.3 "Do's and Don'ts"

Regards,
Octo

0 Zain Alishammat 7 months ago in reply to Octo Halsema

Prodigy 220 points

Hi Octo,

Octo Halsema said:
Yes, power all the VDDO_x pins when using this LMK.

Even when i just use 2 outputs, 7 and 4?

Zain

+1 Octo Halsema 7 months ago in reply to Zain Alishammat

Intellectual 321 points

Yes, according to datasheet, even proper supply decoupling and bypassing is needed to guarantee that there is no spontaneous behaviour in the unused block that can couse interference.
To reduce BOM, one can tie together the unused VDDO pins but still powered and decoupled.

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LMK05318B: Schematic ping setup