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DAC1006LCN Folha de dados(PDF) 11 Page - National Semiconductor (TI) |
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DAC1006LCN Folha de dados(HTML) 11 Page - National Semiconductor (TI) |
11 / 22 page FIGURE 10 Providing a Bipolar Output Voltage with a Single Op Amp TLH5688 – 13 FIGURE 11 Increasing the Output Voltage Swing The output voltage swing can be expanded by adding 2 resistors to Figure 10 as shown in Figure 11 These added resistors are used to attenuate the aV voltage The overall gain AV(b) from the aV terminal to the output of the op amp determines the most negative output voltage b4(aV) (when the VREF voltage at the a input of the op amp is zero) with the component values shown The complete dy- namic range of VOUT is provided by the gain from the (a) input of the op amp As the voltage at the VREF pin ranges from 0V to aV(10231024) the output of the op amp will range from b10 VDC to a10V (10231024) when using a a V voltage of a2500 VDC The 25 VDC reference voltage can be easily developed by using the LM336 zener which can be biased through the RFB internal resistor connected to VCC 53 Op Amp VOS Adjust (Zero Adjust) for Current Switching Mode Proper operation of the ladder requires that all of the 2R legs always go to exactly 0 VDC (ground) Therefore offset voltage VOS of the external op amp cannot be tolerated as every millivolt of VOS will introduce 001% of added linearity error At first this seems unusually sensitive until it becomes clear the 1 mV is 001% of the 10V reference High resolu- tion converters of high accuracy require attention to every detail in an application to achieve the available performance which is inherent in the part To prevent this source of error the VOS of the op amp has to be initially zeroed This is the ‘‘zero adjust’’ of the DAC calibration sequence and should be done first If the VOS is to be adjusted there are a few points to consid- er Note that no ‘‘dc balancing’’ resistance should be used in the grounded positive input lead of the op amp This re- sistance and the input current of the op amp can also create errors The low input biasing current of the BI-FET op amps makes them ideal for use in DAC current to voltage applica- tions The VOS of the op amp should be adjusted with a digital input of all zeros to force IOUTe0mA A1kX resistor can be temporarily connected from the inverting input to ground to provide a dc gain of approximately 15 to the VOS of the op amp and make the zeroing easier to sense 54 Full-Scale Adjust The full-scale adjust procedure depends on the application circuit and whether the DAC is operated in the current switching mode or in the voltage switching mode Tech- niques are given below for all of the possible application circuits 541 Current Switching with Unipolar Output Voltage After doing a ‘‘zero adjust’’ set all of the digital input levels HIGH and adjust the magnitude of VREF for VOUTeb(ideal VREF) 1023 1024 This completes the DAC calibration 11 |
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Descrição semelhante - DAC1006LCN |
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