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For an N bit F – V converter, to ensure less than ½ LSB output ripple, the time constant T of simple RC low pass filter must be at least (Where T0 is the output period of the n bit converter):

For an N bit F – V converter, to ensure less than ½ LSB output ripple, the time constant T of simple RC low pass filter must be at least (Where T0 is the output period of the n bit converter): Correct Answer T = 0.69 (n + 1)T<sub>0</sub>

Frequency-to-voltage converter:

  • Instead of summing voltages, counters can be used to generate a frequency. The digital pulses can be averaged using a low-pass filter to get voltage.
  • A frequency-Voltage converter uses a counter to feed into the low-pass filter.
  • To ensure less than ½ LSB output ripple, the time constant (RC) must be long enough for the output to settle, i.e.

T ≥ 0.69 (n + 1)T0

n – No. of bits

  1.  

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