# What is comparator threshold voltage?

Discussion in 'Homework Help' started by exidez, Oct 30, 2008.

1. ### exidez Thread Starter Member

Aug 22, 2008
26
0
Her is the question:
the successive approximation ADC shown in Figure 6.1, the clock frequency is 1.0MHz; the comparator Threshold voltage VT = 0.1mV, the DAC has a Full Scale output of 10.23 V and a 10 bit input.. Determine:
3.4.1 the digital equivalent obtained for VA = 3.728 V;

Pic is attached

i am new to this binary stuff and i have no idea how to do it.
if the range is 10.23 V and is a 10 bit system
2^10 - 1 = 1023 steps

10.23 / 1023 = 0.01 V per step

Thats as far as i got, i dont even understand the diagram!

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2. ### beenthere Retired Moderator

Apr 20, 2004
15,808
295
In operation the counter goes from 0 to some number as it it clocked. With each clock, the output voltage increases by 10 mv. When the voltage out of the DAC matches the input voltage, the comparator stops the counting and sends the EOC. The value in the counter is the conversion.

3. ### exidez Thread Starter Member

Aug 22, 2008
26
0
thanks for that, base on that information i can derived to an answer.
Thanks