For ADC power supply, the AM335x datasheet lists VDDA_ADC recommended operating range as 1.8v +/- 5% (Table 3-12), and absolute max as 2.1v (Table 3-1).
For ADC signals inputs, the max range is listed as 0-VDDA_ADC (Table 3-17), so it should not exceed the input power supply level. No tolerance is given! I have rev F of the document (Apr 2013), table numbers may have changed in later revs. Craig On Monday, December 1, 2014 3:54:15 PM UTC-5, Curt Carpenter wrote: > > Hello Gerald > > Thank you for the input. > > I understand that the design nominal is 1.8V given the subsystem's supply > voltage, but am concerned about transients which may exceed this, or drop > below 0V.The data sheet, p. 79, "Steady State Max Voltage at all I/O Pins" > says that the limits are -0.5V to supply voltage + 0.3V. Given that the > ADC supply (nominal) is 1.8 volts, wouldn't this place the min. and max at > -0.5 to 2.1V? What is the current limit on the ADC pins within these > limits? Is there anywhere I should look to get some insight into the > actual ADC input circuitry re. input protection and configuration? > > Thanks, > Curt > > On Monday, December 1, 2014 2:13:17 PM UTC-6, Gerald wrote: >> >> Max is 1.8V. >> >> Gerald >> >> >> On Mon, Dec 1, 2014 at 2:11 PM, Curt Carpenter <[email protected]> wrote: >> >>> >>> Does anyone have an electrical model/schematic for the Beaglebone ADC >>> inputs? Can anyone point me to the absolute max/recommended operating >>> conditions for these inputs in the data sheet or elsewhere? I've looked, >>> but can't seem to find the data, although I suspect that it's there >>> somewhere! >>> >>> Thanks. >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> >> -- >> Gerald >> >> [email protected] >> http://beagleboard.org/ >> http://circuitco.com/support/ >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
