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AD7226 Arkusz danych(PDF) 11 Page - Analog Devices |
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AD7226 Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 12 page AD7226 REV. A –11– OFFSET ADJUST Figure 21 shows how the AD7226 can be used to provide pro- grammable input offset voltage adjustment for the AD544 op amp. Each output of the AD7226 can be used to trim the input offset voltage on one AD544. The 620 k Ω resistor tied to +10 V provides a fixed bias current to one offset node. For symmetrical adjustment, this bias current should equal the current in the other offset node with the half-full scale code (i.e., 10000000) on the DAC. Changing the code on the DAC varies the bias current and hence provides offset adjust for the AD544. For ex- ample, the input offset voltage on the AD544J, which has a maximum of ±2 mV, can be programmably trimmed to ±10 µV. Figure 21. Offset Adjust for AD544 Microprocessor Interface Figure 22. AD7226 to 8085A Interface Figure 23. AD7226 to 6809 Interface Figure 24. AD7226 to 6502 Interface Figure 25. AD7226 to Z-80 Interface |
Podobny numer części - AD7226 |
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Podobny opis - AD7226 |
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