Download Linear-Digital IC`s

Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
Analog to Digital Conversion - increase comparison voltage in steps
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Linear-Digital ICs
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Linear-Digital ICs
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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
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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
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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
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
Phase Locked Loop
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
FSK Decoder
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
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Linear-Digital ICs
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