| ??? 05/27/08 13:32 Read: times |
#155151 - ADC of Silabs MCU |
I want to use the 12 bit ADC of the Silabs 8051F020 chip to measure two channels with a span of -10V to +10V each.
I will be using the Development Kit for the chip - so I guess no issues of split ground planes, proper layout etc. And I will be content if I can get10 bit accuracy finally.. Planning to power the kit from a good Linear power supply. Question is, what kind of input attenuation will be required to measure the whole span of +/-10V ? And I guess instead of doing it with simple resistor networks, it is better done with Op-Amps so that I can get a low impedance signal to the ADC input( to get better sampling times ) Or is it easier to use a high voltage variant from the Silabs range - I remember to have seen one such. Any tips in this regard welcome. Thanks Raghu |
| Topic | Author | Date |
| ADC of Silabs MCU | 01/01/70 00:00 | |
| At best the SiLabs A/D.... | 01/01/70 00:00 | |
| A Simple Attenuator | 01/01/70 00:00 | |
| Tweaking... | 01/01/70 00:00 | |
| Further tweaking.. | 01/01/70 00:00 | |
| yes | 01/01/70 00:00 | |
| I had that coming.. | 01/01/70 00:00 | |
| Drop the Trim | 01/01/70 00:00 | |
| 100% practical with theory | 01/01/70 00:00 | |
| For your A/D Subsystem.... | 01/01/70 00:00 | |
| buffer op-amp | 01/01/70 00:00 | |
| Chosen Op-Amp : CA5420A | 01/01/70 00:00 | |
| Settling time? | 01/01/70 00:00 | |
| My signal is a slowly varying one | 01/01/70 00:00 | |
settling time | 01/01/70 00:00 | |
| internal reference specified from 2.36 to 2.48 V! | 01/01/70 00:00 | |
| do not calibrate if you can avoid it | 01/01/70 00:00 |