JAJSD74E February 2016 – August 2022 ADS8681 , ADS8685 , ADS8689
PRODUCTION DATA
The device supports a pseudo-differential input supporting both bipolar and unipolar input ranges. The output of the device is in straight-binary format for both bipolar and unipolar input ranges.
The ideal transfer characteristic for all input ranges is shown in Figure 7-19. The full-scale range (FSR) for each input signal is equal to the difference between the positive full-scale (PFS) input voltage and the negative full-scale (NFS) input voltage. The LSB size is equal to FSR / 216. For a reference voltage of VREF = 4.096 V, the LSB values corresponding to the different input ranges are listed in Table 7-4.
INPUT RANGE | POSITIVE FULL-SCALE (V) | NEGATIVE FULL-SCALE (V) | FULL-SCALE RANGE (V) |
LSB |
---|---|---|---|---|
±3 × VREF | 12.288 | –12.288 | 24.576 | 375.0 µV |
±2.5 × VREF | 10.24 | –10.24 | 20.48 | 312.5 µV |
±1.5 × VREF | 6.144 | –6.144 | 12.288 | 187.5 µV |
±1.25 × VREF | 5.12 | –5.12 | 10.24 | 156.25 µV |
±0.625 × VREF | 2.56 | –2.56 | 5.12 | 78.125 µV |
0 to 3 × VREF | 12.288 | 0 | 12.288 | 187.5 µV |
0 to 2.5 × VREF | 10.24 | 0 | 10.24 | 156.25 µV |
0 to 1.5 × VREF | 6.144 | 0 | 6.144 | 93.75 µV |
0 to 1.25 × VREF | 5.12 | 0 | 5.12 | 78.125 µV |