voltage control question

ilter · Oct 7, 2005

Dear all,
My digital power is 1.8V but my analog power is 3.3V.
My analog need digital control. So how do I my signal 1.8V transform to 3.3V and 0V transform 0V? Thanks.

electronrancher · Oct 7, 2005

open-drain output. 1.8v logic drives an nmos that has a pullup to 3.3v.

ilter · Oct 8, 2005

electronrancher said:
open-drain output. 1.8v logic drives an nmos that has a pullup to 3.3v.

Dear electronrancher,
Can you draw a picture? Thanks.

sunking · Oct 8, 2005

it the speed is not high, use a latch

VVV · Oct 8, 2005

If unidirectional level translation is necessary and speed is not an issue, use open-collector logic with pullups to 3.3V.

If you need bidirectional communication and speed IS an issue, use a level translator, such as this one: https://focus.ti.com/docs/prod/folders/print/sn74avc1t45.html

Or, some of these: www.analog.com/en/subCat/0,2879,767%5F828%5F0%5F%5F0%5F,00.html

marshel · Oct 8, 2005

hi,you can use level shift circuit shown in the attachment, a very commaon logic transfer circuit used for different power voltage.

voltage control question

ilter

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