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AD590 Scheda tecnica(PDF) 3 Page - Intersil Corporation |
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AD590 Scheda tecnica(HTML) 3 Page - Intersil Corporation |
3 / 10 page 3 Trimming Out Errors The ideal graph of current versus temperature for the AD590 is a straight line, but as Figure 1 shows, the actual shape is slightly different. Since the sensor is limited to the range of -55oC to 150oC, it is possible to optimize the accuracy by trimming. Trimming also permits extracting maximum performance from the lower-cost sensors. The circuit of Figure 2 trims the slope of the AD590 output. The effect of this is shown in Figure 3. The circuit of Figure 4 trims both the slope and the offset. This is shown in Figure 5. The diagrams are exaggerated to show effects, but it should be clear that these trims can be used to minimize errors over the whole range, or over any selected part of the range. In fact, it is possible to adjust the I-grade device to give less than 0.1oC error over the range 0oC to 90oC and less than 0.05oC error from 25oC to 60oC. FIGURE 1. TRIMMING OUT ERRORS T (oK) IDEAL ACTUAL (GREATLY EXAGGERATED) FIGURE 2. SLOPE TRIMMING +5V R 100 Ω + AD590 - R = SLOPE + + 950 Ω VOUT = 1mV/ oK FIGURE 3. EFFECT OF SLOPE TRIM T (oK) IDEAL ACTUAL TRIMMED FIGURE 4. SLOPE AND OFFSET TRIMMING +10V 35.7k Ω R1 2kΩ + AD590 - V - R1 = OFFSET R2 = SLOPE VOUT = 100mV/ oC 97.6k Ω R2 5kΩ FIGURE 5A. UNTRIMMED FIGURE 5B. TRIM ONE: OFFSET FIGURE 5C. TRIM TWO: SLOPE AD590 |
Codice articolo simile - AD590_02 |
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Descrizione simile - AD590_02 |
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