| ??? 11/29/05 13:25 Read: times |
#104351 - I do not see how that can be done Responding to: ???'s previous message |
i am planning to build a application which can support 1,00,000 counts if can suggest a serial adc
To achieve this precision 100.000 with "low cost" I do not see how that can be done. When I did weigh scales for one of the worlds largest manufacturers of scales we did not have that precision even in the most expensive scales. Just a fast calculation: if you use a "normal" 24 bit ADC with a max in of 5v to achieve a precision of 100.000 you need to "see" a change of 50uV. If you find the ~3 year old discussion of the TI/BB '51 with a 24 bit ADC (I forget the part number) and check the post of whomever that did peruse the spec you will see that the maximum precision was 16 bits and that was even with no "circuit interference". As Burr-Brown probably is one of the worlds most advanced analog chip makers and that is the best they can do, how do you propose to do better with "low cost"? I do not know if you are confusing "resolution" with "precision" so, I shall not claim taht you do but i bring up the point just in case. Erik |
| 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 |