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DAC0890CIJ bảng dữ liệu(PDF) 9 Page - National Semiconductor (TI) |
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DAC0890CIJ bảng dữ liệu(HTML) 9 Page - National Semiconductor (TI) |
9 / 12 page Applications Information Full-Scale Output Voltage Range Selection The DAC0890 has been designed for ease of use All refer- ence voltage and output amplifier connections are internal All trims such as full-scale (gain) and zero (offset) are per- formed during manufacturing Therefore no external trim- ming is required to achieve the specified accuracy The only external connections required select the desired full-scale output voltage range The two full-scale output voltage ranges are selected by connecting SENSE SELECT and VOUT as shown in Figure 2a b The 255V range can be used with supply voltages as low as 475V The 102V range can be selected with sup- plies as low as 120V TLH10592 – 8 FIGURE 2a 0V to 255V Output Voltage Range TLH10592 – 9 FIGURE 2b 0V to 102V Output Voltage Range Power Supply Voltage The DAC0890 is designed to operate on a single power supply voltages a475V and a165V For 255V full-scale operation the power supply voltage can be as low as a 475V When the 102V full-scale is used the supply volt- age needs to be between a12V to a165V Grounding and Power Supply Bypassing Proper grounding is essential to extract all the precision and full rated performance that the DAC0890 is capable of deliv- ering Typical applications for the DAC0890 include opera- tion with a microprocessor In this environment digital noise is prevalent and anticipated Therefore special care must be taken to ensure that proper operation will be achieved The DAC0890 uses two ground pins AGND and DGND to minimize ground drops and noise in the analog signal paths Figure 3 details the proper bypassing and ground connec- tions The DAC0890’s best performance can be ensured by con- necting 001 mFto0 1 mF ceramic capacitor in parallel with an electrolytic of 22 mFto22 mF between the Va pin and AGND Sense Inputs The SENSE inputs (pins 13 and 19) allow compensation for voltage drops in long output lines to remote loads This places the drops in the internal amplifier’s feedback loop An example of this is shown in Figure 3 The I-R drop which might be caused by printed circuit board traces or long ca- bles between the VOUT2 and the load impedance RL is placed inside the feedback loop if SENSE1 is connected directly to the load This forces the voltage at the load to be the correct value It is important to remember that the volt- age at the DAC0890’s VOUT pins may become higher than the full-scale output voltage selected using the SELECT pins Therefore the power supply voltage applied to Va must be t22V above the resulting output voltage (at pins 14 and 18) when the SENSE inputs are used The SENSE inputs have a finite input impedance The range-setting resistors load the output with 25 kX when the 0V to 255V range is selected and 10 kX when the 0V to 102V range is selected TLH10592 – 10 FIGURE 3 Typical Connection Showing Power Supply Bypassing and the Use of SENSE Inputs 9 |
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