Question

There are two ADCs, bit digital ramp ADC and a 10 bit successive approximation ADC. If both utilize a 500kHz clock frequency, then ratio of conversion time of digital ramp ADC and successive approximation ADC is _______

• A. 102.3

Answer 1

The correct option is A 102.3

$t=\frac{1}{f}=\frac{1}{500\times {10}^3}=2\mu s$

$t_{c1}=(2^N-1)\times 1clockcycle$

$=1023\times 2=2046\mu s$

$t_{c2}=10\times 2=20\mu s$

$\frac{t_{c1}}{t_{c2}}=\frac{2046}{20}=102.3$