Update for 15-11-21 15:45
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@ -6,5 +6,21 @@ This is also known as sampling.
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== Overview ==
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=== Parallel ===
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1) Analog voltage is converted to a codeword, by running the voltage through a
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series of comparators, each tied to a different voltage
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2) The series of codewords are put through a series of logic gates that convert
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the code words to a n-bit value, ranging from 0V to VREF
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- ie. VREF = 5V, 10-bit ADC, each step is 5/(2^10) = 4.9mV
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This is a very fast way to implement a ADC, however for a n-bit resolution it
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requires 2^n - 1 comparators, and 2N resistors (for voltage dividers) to
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convert the signal
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=== Counting ===
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1) Compare the analog input voltage to an output from a [[DAC]]
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2) Each time a comparison fails, increment a counter
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3) When the [[DAC]] voltage is larger than the analog voltage, we have found the
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correct value
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9
tech/DAC.wiki
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9
tech/DAC.wiki
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@ -0,0 +1,9 @@
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= DAC =
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A Digital to Analog Converter (DAC) is a type of circut that converts a digital
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signal to a voltage somehwere between GND and VREF (usually VCC). A common
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use of a DAC is when converting digital music to a sound signal
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== Overview ==
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1) A voltage divider (resistors in series) split the VREF into equal parts
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