Question

Maximum conversion time in clock cycles for three types of 8 bit ADCs
(a) Successive approximation
(b) Dual-slope
(c) Parallel Comparator are respectively

• A. 8, 512, 1
• B. 8, 256, 4
• C. 16, 256, 2
• D. 256, 8, 1

Answer 1

The correct option is A 8, 512, 1

(a) Successive approximation:
$T_{max}=n{T}_{clk}=8T_{clk}$
(b) Dual-slope:
$T_{max}=2^{n+1}{T}_{clk}=2^{(8+1)}{T}_{clk}$
$=2^9{T}_{clk}=512T_{clk}$
(c) Parallel Comparator:
$T_{max}=1T_{clk}$