| ??? 11/29/05 12:04 Read: times |
#104338 - Precision of these ADCs is much lower Responding to: ???'s previous message |
Andy said:
Purely for the sake of example, let's say that your Least-Significant Bit (LSB) represents 1 gramme.
Your full-scale, 24-bit reading is 0xFFFFFF = 16,777,215 - nearly 17 tonnes!! :-0 These 24bit ADC show an effective precision of no more than 16...18bit. This is due to noise and other imperfections. So, to use such a 24bit ADC makes sense for wheighing applications. Ravi, If I remember correctly, Texas Instruments has a micro, containing a '51 core and a 24bit ADC, built for wheighing applications. Noise is very low. Kai |
| Topic | Author | Date |
| low cost ADC | 01/01/70 00:00 | |
| What is needed?? | 01/01/70 00:00 | |
| weighing scale application | 01/01/70 00:00 | |
| USE TI ADC ADS1242 COSTS $2 10K PIECES | 01/01/70 00:00 | |
| Why 24 bits? | 01/01/70 00:00 | |
| 1,00,000 counts | 01/01/70 00:00 | |
| How many?? | 01/01/70 00:00 | |
| 100,000 (one hundred thousand) | 01/01/70 00:00 | |
| 10ppm | 01/01/70 00:00 | |
| Low cost ADC | 01/01/70 00:00 | |
| Using loadcell? | 01/01/70 00:00 | |
| Load cell | 01/01/70 00:00 | |
I do not see how that can be done | 01/01/70 00:00 | |
| Precision of these ADCs is much lower | 01/01/70 00:00 | |
| Oxymoron? | 01/01/70 00:00 | |
| how often do we see | 01/01/70 00:00 | |
| Not quite true Erik | 01/01/70 00:00 | |
| Poor specification | 01/01/70 00:00 |