| ??? 05/27/08 13:44 Read: times |
#155152 - At best the SiLabs A/D.... Responding to: ???'s previous message |
At best the SiLabs A/D measures 0-3.3V (and more like 0-2.5V if a decent reference is provided). You should really consider using an opamp to buffer the signal for each channel. If you analog source is super low impedance then it may be possible to use input attenuators. However, consider that the attenuator dividers may need to divide to the VREF +V pin and that may demand a low impedance VREF as well and may compromise the VREF accuracy.
Michael Karas |
| 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 |