| ??? 11/29/05 11:43 Read: times |
#104336 - Using loadcell? Responding to: ???'s previous message |
I think using commonly available loadcell and low cost ADC, it is difficult to achieve 1 in 100,000. It may be possible if special loadcell (some manufacture their own)and temperature compensation. We have optained 1 in 60,000 using CS5532AS ADC from Cirrus, but we need to specifiy sensitivity drift of more than 25PPM/one degree centigrade. ADS1242 will not suit for high resolution It was conveyed to us by TI, we achieved in this 1 in 30,000. The reason being ADS1242 use 2 order whereas CS5532AS use 4 order modulator providing better noise shaping. Needless to say PCB design, amplifier design is very important. |
| 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 |