AD7226KN(RevA) 查看數據表（PDF） - Analog Devices

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AD7226KN
(Rev.:RevA)

LC2MOS Quad 8-Bit D/A Converter

Analog Devices 

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 kΩ 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.

Microprocessor Interface

AD7226

Figure 21. Offset Adjust for AD544

Figure 22. AD7226 to 8085A Interface

Figure 24. AD7226 to 6502 Interface

Figure 23. AD7226 to 6809 Interface

Figure 25. AD7226 to Z-80 Interface

REV. A

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