ZHCSH81 December 2017 PGA302
PRODUCTION DATA.
Following is application data measured from a PGA302EVM-037 board. The PGA302 device has been used and was calibrated with three pressure points at one temperature (3P1T) using a resistive bridge emulator board with a schematic as pictured in Figure 117.
For setup, the only parameter changed was to increase the PGAIN of the PGA302 device to 40 V/V. After the calibration was performed, the resulting VOUT output voltages were measured at each of the three pressure points and error was calculated based on the expected values as shown in Table 67. Error was calculated using the formula ((VOUT measured – VOUT Expected)/VOUT range) × 100 to account for the expected output range.
CALIBRATION POINT | VDD (V) | VINPP - VINPN (mV) | VOUT MEASURED (V) | VOUT EXPECTED (V) | ERROR (%FSR) |
---|---|---|---|---|---|
P1 | 4.8642 | 34.651 | 0.503 | 0.5 | 0.075 |
P2 | 4.8602 | 13.844 | 2.501 | 2.5 | 0.025 |
P3 | 4.8589 | 1.608 | 4.498 | 4.5 | –0.05% |
Additional testing was also done with varying calibration points of 3P3T and 4P4T to show accuracy data across temperature. Table 68 includes 3P3T and 4P4T data at the P2 (2.5-V VOUT) pressure point only. The experimental setup is identical to that used to produce the 3P1T data shown in Table 67 with the exception of the resistive bridge emulator which includes an extra pressure point for four possible calibration points.
CALIBRATION METHOD | VOUT VOLTAGE | ERROR, %FSR | ||||
---|---|---|---|---|---|---|
–40°C | 50°C | 150°C | –40°C | 50°C | 150°C | |
3P3T | 2.494 | 2.503 | 2.502 | 0.0125 | 0.2625 | 0.2875 |
4P4T | 2.495 | 2.501 | 2.502 | 0.0375 | 0.2375 | 0.3125 |