Electronics - Analog and Digital Converters - Discussion
Discussion Forum : Analog and Digital Converters - General Questions (Q.No. 2)
2.
A 4-bit R/2R digital-to-analog (DAC) converter has a reference of 5 volts. What is the analog output for the input code 0101.
Discussion:
34 comments Page 2 of 4.
Manjeet said:
1 decade ago
Vo = 5(Vi/16)
= 5(5/16)
= 1.5625
4-bit R/2R digital-to-analog....
Here what about R/2R...?
I think 1.5625 x 2 = 3.125V
= 5(5/16)
= 1.5625
4-bit R/2R digital-to-analog....
Here what about R/2R...?
I think 1.5625 x 2 = 3.125V
SUMIT SHAH said:
1 decade ago
Main equation is,
Vo= Vref * (b0*2^(-1)+b1*2^(-2)+....)
Vo= 5 * (1*2^(-1)+0*2^(-2)+1*2^(-3)+0*2^(-4))
Vo=3.125V
Vo= Vref * (b0*2^(-1)+b1*2^(-2)+....)
Vo= 5 * (1*2^(-1)+0*2^(-2)+1*2^(-3)+0*2^(-4))
Vo=3.125V
Ashu said:
1 decade ago
Vo = 5(0/16+1/8+0/4+1/2).
Vo = 3.125.
Vo = 3.125.
Vidya said:
1 decade ago
Vout = Resolution * Decimal equivalent of given No.
Where Resolution = Vref/(2^n)-1
Resolution = 5/(2^4)-1 = 5/7
And dec No = 5
So answer = 25/7 = 3.125.
Where Resolution = Vref/(2^n)-1
Resolution = 5/(2^4)-1 = 5/7
And dec No = 5
So answer = 25/7 = 3.125.
(1)
Vaishnavi murugan said:
1 decade ago
Formula = [Vref/(2^n)] {msb bit * 2^0 + next bit * 2^1 + next bit * 2^2 + lsb bit * 2^3}.
Where n = no of bit,
Solution:
Vref = 5v;
n = 4;
=> (5/(2^4)) {0*0 + 1*2 + 0*4 + 1*8}
=> (5/16) {0 + 2 + 0 + 8}
=> (0.3125) {10}
=> 3.125.
Answer => 3.125.
Where n = no of bit,
Solution:
Vref = 5v;
n = 4;
=> (5/(2^4)) {0*0 + 1*2 + 0*4 + 1*8}
=> (5/16) {0 + 2 + 0 + 8}
=> (0.3125) {10}
=> 3.125.
Answer => 3.125.
GOPAL said:
1 decade ago
@Nirja.
Formula = (Vref/2^N)(dec equivalent of i/p).
N- is number of significant bits (here 3 as msb is 0).
Here 0101 = 101 hence consider 3 bit.
Therefore,
Vo = 5(Vi/8) = 3.12.
Formula = (Vref/2^N)(dec equivalent of i/p).
N- is number of significant bits (here 3 as msb is 0).
Here 0101 = 101 hence consider 3 bit.
Therefore,
Vo = 5(Vi/8) = 3.12.
Shah said:
1 decade ago
MOST EASY METHOD:
V(0ut) = (Vi/8)*digital input.
V(0ut) = (Vi/8)*digital input.
Nitu said:
1 decade ago
Vo = (Rf/R)(Vref)(Do/16+D1/8+D2/4+D3/2).
Nisha said:
1 decade ago
In case of inverting, Vo = -1.5625 V.
In case of non-inverting, Vo = 3.125V.
So the given answer is correct.
In case of non-inverting, Vo = 3.125V.
So the given answer is correct.
Sarika rajesh banda said:
10 years ago
Yes,
Actual answer is 1.5625 volts.
Given in the sum is reference voltage = 5v, and resolution = 4.
So voltage per lsb = vref/2^n = 5/2^4 = 0.3125 v/lsb.
Therefore = 0101 in decimal is 5 = 5*0.3125 = 1.5625.
Actual answer is 1.5625 volts.
Given in the sum is reference voltage = 5v, and resolution = 4.
So voltage per lsb = vref/2^n = 5/2^4 = 0.3125 v/lsb.
Therefore = 0101 in decimal is 5 = 5*0.3125 = 1.5625.
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