VDDA connection on ADC of STR75x

md1 · ‎2007-02-27

Posted on February 27, 2007 at 10:18

md1 · ‎2007-02-27

Posted on February 27, 2007 at 09:04

Hi,

Can the Vdda of the A/D converter be connected to any other source but Vdd on the STR75x devices. For instance, if the device is running at 3.3V, is it acceptable to connect the Vdda to 2.5V.

Thanks,

Martin.

kaouther · ‎2007-02-27

Posted on February 27, 2007 at 10:13

Hi Martin,

The Vdda of the A/D converter must have the same level voltage as the Vdd of IO. it could not have different voltage level. Please refer to STR75x Reference manual regarding power supply pins recommendation.

Thanks.

jgoril · ‎2007-02-27

Posted on February 27, 2007 at 10:18

Hi. Look at family reference manual UM0191, chapter 2.2 - VDDA_ADC must have the same voltage level as VDD_IO...

Using separate pin is probably just a way how to have the supply for this sensitive block as filtered as possible :)