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Transcript
Linear-Digital ICs 1 of 25 Linear-Digital ICs 2 of 25 Linear-Digital ICs 3 of 25 Linear-Digital ICs Analog to Digital Conversion - increase comparison voltage in steps 4 of 25 Linear-Digital ICs 5 of 25 Linear-Digital ICs 6 of 25 Digital Input to ladder network - switches connect a voltage source to a resistor if the input is a “1” or to ground if the input is a “0”. Bit1 Bit0 Rightmost Code = 11 = 3 Leftmost 5V/4 = 1.25V per step 1k 2k Code = 10 = 2 1k 2k 2k 1k 1k 2k 2k 2k 2k 2.5 5 5 5 0 5 0 0 Vo = 2.5 1k 2k 1k 2k 2k 2k 2.5mAdc 2k 1.25mAdc 5 I1 I3 0 1k 2k 2.5mAdc 5 I5 0 0 Vo = 3.75 1k Code = 01 = 1 1k 2k 1k Vo = 1.25 1k 1k 2.5mAdc I2 3.75mAdc 5 I4 2.5 0 0 0 2k Linear-Digital ICs 7 of 25 For a reference voltage of 24V, calculate the output voltage for an input to the circuit of 01011. 25 = 32 24V/32 = 0.75 V/step Vo = 0.75V(0*24 + 1*23 + 0*22 + 1*21 + 1*20) = 0.75V(0 + 8 + 0 + 2 + 1) = 0.75(11) = 8.25 For a code of 11111 the result is 31 * 0.75 = 23.25 Linear-Digital ICs 8 of 25 Using the 5-bit A/D above to convert 16.9V to digital 16.9/0.75 = 22.53 Round up to 23 23/2 = 11/2 = 5/2 = 1/2 = 23 11 + 5 + 2 + 0 + 1 1 1 1 1*20 1*21 1*22 0*23 1*24 = = = = = 1 2 4 0 16 Linear-Digital ICs http://courses.ncsu.edu:8020/ece480/common/htdocs/480_555.htm 9 of 25 Linear-Digital ICs 10 of 25 Linear-Digital ICs 11 of 25 Linear-Digital ICs 12 of 25 Linear-Digital ICs 13 of 25 Linear-Digital ICs 14 of 25 Linear-Digital ICs Phase Locked Loop 15 of 25 Linear-Digital ICs 16 of 25 Linear-Digital ICs 17 of 25 Linear-Digital ICs FSK Decoder 18 of 25 Linear-Digital ICs 19 of 25 Linear-Digital ICs 20 of 25 Linear-Digital ICs 21 of 25 Linear-Digital ICs 22 of 25 Linear-Digital ICs 23 of 25 Linear-Digital ICs 24 of 25 Linear-Digital ICs 25 of 25