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DAC1218 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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DAC1218 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 12 page Application Hints (Continued) 30 OBTAINING A BIPOLAR OUTPUT VOLTAGE FROM A FIXED REFERENCE The addition of a second op amp to the circuit of Figure 2 can generate a bipolar output voltage from a fixed reference voltage ( Figure 7 ) This in effect gives sign significance to the MSB of the digital input word to allow two quadrant mul- tiplication of the reference voltage The polarity of the refer- ence voltage can also be reversed to realize full 4-quadrant multiplication The output responds in accordance to the following expres- sion VO e VREF Db2048 2048 J 0sDs4095 where D is the decimal equivalent of the true binary input word This configuration inherently accepts a code (half- scale or De2048) to provide 0V out without requiring an external LSB offset as needed by other bipolar multiply- ing DAC circuits Only the offset voltage of amplifier A1 need be nulled to preserve linearity The gain setting resistors around A2 must match and track each other A thin film 4-resistor network available from Beckman Instruments Inc (part no 694-3- R10K-D) is ideally suited for this application Two of the four resistors can be paralleled to form R and the other two can be used separately as the resistors labeled 2R Operation is summarized in the table below Applied Decimal VOUT Digital Input Equivalent a VREF b VREF MSB LSB 1 1 1 1 1 1 1 1 1 1 1 1 4095 VREFb1 LSB b VREF la1 LSB 1 1 0 0 0 0 0 0 0 0 0 0 3072 VREF 2 b lVREFl 2 1 0 0 0 0 0 0 0 0 0 0 0 2048 0 0 0 1 1 1 1 1 1 1 1 1 1 1 2047 b 1 LSB a 1 LSB 0 1 0 0 0 0 0 0 0 0 0 0 1024 b VREF 2 a lVREFl 2 0 0 000000000 0 0 b VREF a lVREFl Where 1 LSB e l VREF l 2048 01% matching TLH5691 – 9 FIGURE 7 Obtaining a Bipolar Output from a Fixed Reference 8 |
Número de pieza similar - DAC1218 |
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Descripción similar - DAC1218 |
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