Describe the operation of voltage to frequency ADC, Computer Engineering

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Describe the operation of voltage to frequency ADC.

Ans:

A voltage-to-frequency converter i.e. VFC is an oscillator that frequency is linearly proportional to a control voltage. The voltage-to-frequency converter A to D Convertor is monotonic and free of missing codes, integrates noise and can consume extremely little power.

The current-steering multivibrator voltage-to-frequency converter is in fact a current to-frequency converter quite than a VFC, but, as demonstrated in Figure below, practical circuits invariably have a voltage to-current converter at the input.

The principle of operation is evident: the current discharges the capacitor till a threshold is reached, and while the capacitor terminals are reversed, the half cycle repeats by itself. The waveform across the capacitor is a linear triangular wave, although the waveform on either terminal regarding ground is the more complicated waveform shown.

1923_voltage to frequency ADC.png

Truth Table

A3	A2	A1	A0	d6	d5	d4	d3	d2	d1	d0	\|	x
-	-	-	-	-	-	-	-	-	-	-	---	-
0	0	0	-	-	-	-	-	-	-	0	\|	0
0	0	0	-	-	-	-	-	-	-	1	\|	1
0	0	1	-	-	-	-	-	-	0	-	\|	0
0	0	1	-	-	-	-	-	-	1	-	\|	1
0	1	0	-	-	-	-	-	0	-	-	\|	0
0	1	0	-	-	-	-	-	1	-	-	\|	1
0	1	1	-	-	-	-	0	-	-	-	\|	0
0	1	1	-	-	-	-	1	-	-	-	\|	1
1	0	0	-	-	-	0	-	-	-	-	\|	0
1	0	0	-	-	-	1	-	-	-	-	\|	1
1	0	1	-	-	0	-	-	-	-	-	\|	0
1	0	1	-	-	1	-	-	-	-	-	\|	1
1	1	0	-	0	-	-	-	-	-	-	\|	0
1	1	0	-	1	-	-	-	-	-	-	\|	1

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