Topic: Digital Electronics
For a 10-bit digital ramp ADC using 500 kHz clock, the maximum conversion time is
- A. $2048~\mu\text{s}$
- B. $2064~\mu\text{s}$
- C. $2046~\mu\text{s}$
- D. $2084~\mu\text{s}$
Answer: C. $2046~\mu\text{s}$
Explanation: For a digital ramp (counter-type) ADC, the maximum conversion time occurs for the full-scale analog input.
Maximum conversion time $= (2^{n}-1)T_{clk} = \frac{(2^{n}-1)}{f_{clk}} = \frac{(2^{10}-1)}{500\times 10^{3}}~\text{s} = \frac{1023}{500\times 10^{3}}~\text{s} = 2046~\mu\text{s}$.