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DAC1218LCJ Scheda tecnica(PDF) 9 Page - National Semiconductor (TI) |
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DAC1218LCJ Scheda tecnica(HTML) 9 Page - National Semiconductor (TI) |
9 / 12 page Application Hints (Continued) 31 Zero and Full-Scale Adjustments The three adjustments needed for this circuit are shown in Figure 7 The first step is to set all of the digital inputs LOW (to force IOUT1 to 0) and then trim ‘‘zero adjust’’ for zero volts at the inverting input (pin 2) of OA1 Next with a code of all zeros still applied adjust ‘‘- full-scale adjust’’ the refer- ence voltage for VOUT e g l(ideal VREF)l The sign of the output voltage will be opposite that of the applied reference Finally set all of the digital inputs HIGH and adjust ‘‘a full- scale adjust’’ for VOUTeVREF (511512) The sign of the output at this time will be the same as that of the reference voltage This a full-scale adjustment scheme takes into ac- count the effects of the VOS of amplifier A2 (as long as this offset is less than 01% of VREF) and any gain errors due to external resistor mismatch 40 MISCELLANEOUS APPLICATION HINTS The devices are CMOS products and reasonable care should be exercised in handling them to prevent catastroph- ic failures due to electrostatic discharge During power-up supply voltage sequencing the negative supply of the output amplifier may appear first This will typi- cally cause the output of the op amp to bias near the nega- tive supply potential No harm is done to the DAC however as the on-chip 15 kX feedback resistor sufficiently limits the current flow from IOUT1 when this lead is clamped to one diode drop below ground As a general rule any unused digital inputs should be tied high or low as required by the application As a trouble- shooting aid if any digital input is left floating the DAC will interpret that input as a logical 1 level Additional Application Ideas For the circuits shown D represents the decimal equivalent of the binary digital input code D ranges from 0 (for an all zeros input code) to 4095 (for an all ones input code) and for any code can be determined from D e 2048(A1) a 1024(A2) a 512(A2) a 2(A11) a 1(A12) where AN e 1 if that input is high AN e 0 if that input is low DAC Controlled Amplifier TLH5691 – 10 9 |
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