2013: 2003 Multi-Range Voltage Reference Scaling Techniques
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CONVERSION/SAMPLING CIRCUITS VOLTAGE REFERENCES
2013: 2003
Multi-Range Voltage Reference Scaling Techniques
data acquisition board, order provide flexibility, must able accommodate various input voltage ranges. Handling amplitude signals generally requires increase number bits resolution, increasing cost. This application note describes simple circuit that uses cost 10-bit increases virtual accuracy 13-bit.
Figure (least significant bit) FSR/2n, where number bit. (Full Scale Range) depends from amplitude voltage reference. input voltage range external reference MAX159, power, 108ksps serial available µMAX-8 package, 50mV. This large input range permits accommodate different input range using scaling technique. output low-cost 3-pin voltage reference scaled using digitally programmable voltage divider (MAX5420). This device provides four precision divider ratios ratio accuracy span from 0.025% 0.5% according grade (A,B,C). ratio selected using digital inputs follows:
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Table DIGITAL INPUTS DIVIDER RATIO reference voltage MAX6141 provides output voltage 4.096V. size using divider ratio will 4.096/1024=4mV. This size change according following table: Table VREF 4.096 2.048 1.024 0.512 DIVIDER RATIO (mV) VIRTUAL ACCURACY 4.096V 10-bit 11-bit 12-bit 13-bit
effective resolution remains bits. compared 4.096V system, virtual accuracy improved. size 1LSB remains greater than typical converter noise floor (300µV), also with divider ratio This ensures that performances limited LSB's reduced size.
MORE INFORMATION MAX159: QuickView MAX5420: QuickView www.maxim-ic.com/an2013
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