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DAC0832LCJ Arkusz danych(PDF) 14 Page - National Semiconductor (TI) |
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DAC0832LCJ Arkusz danych(HTML) 14 Page - National Semiconductor (TI) |
14 / 28 page DAC0830 Series Application Hints (Continued) 2.5 Zero Adjustment For accurate conversions, the input offset voltage of the output amplifier must always be nulled. Amplifier offset errors create an overall degradation of DAC linearity. The fundamental purpose of zeroing is to make the voltage appearing at the DAC outputs as near 0V DC as possible. This is accomplished for the typical DAC — op amp con- nection ( Figure 7) by shorting out R fb, the amplifier feedback resistor, and adjusting the V OS nulling potentiometer of the op amp until the output reads zero volts. This is done, of course, with an applied digital code of all zeros if I OUT1 is driving the op amp (all one’s for I OUT2). The short around Rfb is then removed and the converter is zero adjusted. 00560839 t s OP Amp C C (O to Full Scale) LF356 22 pF 4 µs LF351 22 pF 5 µs LF357* 10 pF 2 µs *2.4 k Ω RESISTOR ADDED FROM−INPUT TO GROUND TO INSURE STABILITY FIGURE 8. www.national.com 14 |
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