Question 30.10: Repeat Ex. 30.9 if the Cyclic ADC input is 600 mV....
Repeat Ex. 30.9 if the Cyclic ADC input is 600 mV.
1. Sample the 600 mV input voltage. The comparator output goes high (MSB, b_{_{7}}, = 1). The output of the multiply by 2, after subtracting V_{_{C M}} (= 500 mV) from the S/H output, is 200 mV.
2. Sample the 200 mV fed back voltage. The comparator output goes low (b_{_{6}} = 0). The output of the multiplier is 400 mV.
3. Sample 400 mV. The comparator output goes low (b_{_{5}} = 0). The output of the multiplier is 800 mV.
4. Sample 800 mV. The comparator output goes high (b_{_{4}} = 1). The output of the multiplier is 600 mV.
5. Sample 600 mV (b_{_{3}} = 1) output of the multiplier is 200 mV.
6. Sample 200 mV (b_{_{2}} = 0) output of the multiplier is 400 mV.
7. Sample 400 mV (b_{_{1}} = 0) output of the multiplier is 800 mV.
8. Sample 800 mV (b_{_{0}} = 1) output of the multiplier is 600 mV.
9. Sample the new input voltage and begin conversion again. The output word in the hold register is 1001 1001 (binary offset).