Lpc2000

Thanks !
Lei
--- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...> 
wrote:
> Hello Lei,
> 
> The LPC2136 ADCs have their own power supply thru the Vdda and Vssa 
> pins. As the datasheet specifies, you can go down to Vdda=2.5V and 
> your ADCs will operate properly. However, keep in mind that the 
Vref 
> level must not be higher than the Vdda, or your ADC will not yield 
> correct results. 
> 
> The ADC operating conditions are: 
> 2.5V <= Vdda <= 3.6V and
> 2.0V <= Vref <= Vdda
> 
> The ADC chapter of the LPC2000 datasheets will be updated in future 
> to reflect these details.
> 
> Regards,
> 
> Philips Apps Team
> 
> 
> 
> --- In lpc2000@yahoogroups.com, "fl429" <fl429@y...> wrote:
> > The manual says, "This should be norminally the same voltage as 
> Vdd but 
> > should be isolated to minimize noise and err"
> > 
> > Does it mean that it will not work correctly if I apply a voltage 
> lower 
> > than Vdd ?
> > 
> > Thanks
> > Lei  
> > --- In lpc2000@yahoogroups.com, "fl429" <fl429@y...> wrote:
> > > Hi, Folks,
> > > 
> > > Does it still work if I apply a lower voltage to the Vref 
(2.5V) 
> than 
> > > the norminal VDD (3.3V) ?
> > > 
> > > Any ideas? 
> > > Thanks 
> > > 
> > > Lei