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DAC0854CIJ bảng dữ liệu(PDF) 9 Page - National Semiconductor (TI) |
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DAC0854CIJ bảng dữ liệu(HTML) 9 Page - National Semiconductor (TI) |
9 / 14 page Applications Information FUNCTIONAL DESCRIPTION The DAC0854 is a monolithic quad 8-bit digital-to-analog converter that is designed to operate on a single 5V supply Each of the four units is comprised of an input register a DAC register a shift register a current output DAC and an output amplifier In addition the DAC0854 has an onboard bandgap reference and a logic unit which controls the inter- nal operation of the DAC0854 and interfaces it to micro- processors Each of the four internal 8-bit DACs uses a modified R-2R ladder to effect the digital-to-analog conversion (Figure 5) The resistances corresponding to the 2 most significant bits are segmented to reduce glitch energy and to improve matching The bottom of the ladder has been modified so that the voltage across the LSB resistor is much larger than the input offset voltage of the buffer amplifier The input digital code determines the state of the switches in the lad- der network The sum of currents IOUT1 and IOUT2 is fixed and is given by IOUT1 a IOUT2 e VREFbVBIAS R J 255 256 The current output IOUT2 is applied to the internal output amplifier and converted to a voltage The output voltage of each DAC is a function of VBIAS VREF and the digital input word and is given by VOUT e 2(VREFbVBIAS) DATA 256 a 511 128 VBIASb 255 128 VREF The output voltage range for each DAC is 03V – 28V This range can be achieved by using the internal 265V reference and a voltage divider network which provides a VBIAS of 140V (Figure 6) In this case the DAC transfer function is VOUT e 25 (DATA) 256 a 0310 The output impedance of any external reference that is used will affect the accuracy of the conversion In order that this error be less than LSB the output impedance of the external reference must be less than 78X TLH11261 – 16 FIGURE 5 Equivalent Circuit of R-2R Ladder and Output Amplifier TLH11261 – 17 FIGURE 6 Generating a VBIAS e 140V from the Internal Reference 9 |
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