參數(shù)資料
型號(hào): AD7226TQ
廠商: ANALOG DEVICES INC
元件分類: DAC
英文描述: LC2MOS Quad 8-Bit D/A Converter
中文描述: QUAD, PARALLEL, 8 BITS INPUT LOADING, 3 us SETTLING TIME, 8-BIT DAC, CDIP20
封裝: CERDIP-20
文件頁(yè)數(shù): 11/12頁(yè)
文件大?。?/td> 247K
代理商: AD7226TQ
AD7226
REV. A
–11–
OFFSE T 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. T he 620 k
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
μ
V.
Figure 21. Offset Adjust for AD544
Mcroprocessor 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
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