LSF0108: schematic check

Tommy Tzeng

Genius 5790 points

Part Number: LSF0108

Hi Sir,

For open drain/push pull 1.8V to 1.2V application, this schematic correct?

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 317370 points

What do you mean with "open drain/push pull"? If there are some open-drain input signals, they need pull-up resistors.

The outputs are more robust if they have pull-up resistors.

0 Tommy Tzeng over 3 years ago in reply to Clemens Ladisch

Genius 5790 points

Hi Sir,

sorry~modify,For push pull 1.8V to 1.2V application, this schematic correct?

0 Michael Ikwuyum over 3 years ago in reply to Tommy Tzeng

TI__Guru 51816 points

Hi Tommy,

Similar to Clemens' feedback, if the signal will always be down translated by a push pull transmitter; then pull ups won't be needed on the inputs of the LSF. If the leakage current into the receiver is <1uA; pull ups won't be needed at the outputs of the LSF as well. Please see the FAQ on how LSF works for more info.

Note that it is recommended to include bypass caps on both supplies similar to VrefB, and as close to the power supply as much as possible.

Also note the VrefB>=VrefA+0.8 requirement per the datasheet, thanks.

Best Regards,

Michael

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LSF0108: schematic check