Part Number: ADS1120 I use the ADS1120 to realize measures between ±20mA. The equipment has 8 cells with one ADS per cell. This cells are isolated between itself. In many of this cells the funcionality is Ok, the componente work well. But in the last production i see 6 componentes that have a compression mistake in negative measures, only, and near FS. One of the test is a curve for test the lineality of input. I put in the inputs, values between -20 and 20mA with 1mA of step. The table of results is: Input CH1 Dif-esl CH2 Dif-esl 0 0 -1 1 -818 818 -818 817 2 -1637 819 -1636 818 3 -2456 819 -2454 818 4 -3274 818 -3273 819 5 -4093 819 -4090 817 6 -4911 818 -4908 818 7 -5730 819 -5727 819 8 -6549 819 -6545 818 9 -7368 819 -7363 818 10 -8185 817 -8182 819 11 -9004 819 -8999 817 12 -9823 819 -9817 818 13 -10641 818 -10636 819 14 -11460 819 -11454 818 15 -12587 1127 -12577 1123 16 -13434 847 -13427 850 17 -14205 771 -14200 773 18 -14998 793 -14992 792 19 -15747 749 -15739 747 20 0 -15747 0 -15739 0 0 -1 1 819 819 819 820 2 1637 818 1637 818 3 2457 820 2455 818 4 3275 818 3274 819 5 4093 818 4091 817 6 4911 818 4910 819 7 5730 819 5727 817 8 6548 818 6545 818 9 7367 819 7363 818 10 8185 818 8181 818 11 9004 819 8999 818 12 9823 819 9818 819 13 10641 818 10636 818 14 11459 818 11453 817 15 12279 820 12272 819 16 13097 818 13090 818 17 13915 818 13908 818 18 14733 818 14726 818 19 15553 820 15544 818 20 16371 818 16363 819 Dif-Esl this tbale is de differencie between one step and the next step. If the lineality is ok, all steps would be identical and the part positive and negative would be like each other. This measure is of one of this cells, in the other cells the measure is ok, and the side positive and negative are identical. My question is about if this problem has seen any time? Or if this is a problem with these ADC's. The circuit of cell, if you want, i can send you.
↧