Major advantage is it
does not require D/A converter and also it does not require any precision
device.. such as DAC or VCO. It uses linear ramp generator to produce a
constant slope reference voltage
Working:
Initially counter is reset and
ramp generator output is 0, which makes the input voltage greater than the reference
voltage and produce a high output from the comparator. This high output of
comparator enables the clock to the counter and starts the ramp generator.
Ramp output will increase
until it equals the analog input V1 at this point, ramp is reset and binary
count is stored in the latches by control logic.
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