The n-bit R/2R digital-to-analog converter (DAC) has a reference of 16 V and the analog
output for the input code 1 is 15.625 mV. how to find the digital input value for the output
9.140625 V ??

 

If 1 count is 15.625mV how many counts in 9.140625V?

 

If 1 count is 15.625mV how many counts in 9.140625V?

It did not give any other details. If you could please explain the theory behind this.

 

If one potato weighs 100g how many potatoes in a 1kg bag of potatoes?

 

What will be the analog output for the input code of 2? Of 3?

See the pattern?

 

If one potato weighs 100g how many potatoes in a 1kg bag of potatoes?

if that so, why they given the reference voltage ?

 

Just to throw you off track.

 

Hello,

The reference value might be the maximum obtainable voltage.

Bertus

 

Look up the concept of ratiometric. The output of a DAC is ratiometric with respect to the reference voltage.

 

if that so, why they given the reference voltage ?

Notice that they don't tell you how many bits the DAC is. Another question probably asks you to find that.

 

Notice that they don't tell you how many bits the DAC is. Another question probably asks you to find that.

They asked the following two questions and I don't clearly understand what it means.

1) Draw a block diagram to interface an 8 bit ADC with 8051. Clearly show your calculations
and assumptions to use above DAC to set the ADC reference voltage 10 V and display the
result in three seven segment displays.

2)
Draw a flowchart to measure analog voltage 5 V using above ADC and DAC. Display the
result in three seven segment displays. Clearly show your calculations and assumptions.

 

They asked the following two questions and I don't clearly understand what it means.

What don't you understand?

Still waiting to see some attempt on your part.

 

The n-bit R/2R digital-to-analog converter (DAC) has a reference of 16 V and the analog
output for the input code 1 is 15.625 mV. how to find the digital input value for the output
9.140625 V ??

for code 1 : 15.625 mV

1 V : 1000/15.625

9.140625V = (1000*9.140625)/15.625 = 585

in binary : 1001001001

 

What don't you understand?

Still waiting to see some attempt on your part.

I don't understand the following things related to the question.

1) What is the reference voltage of DAC's (n bit R/2R).
2) How to find the number of bits in this DAC.
3) how to set reference voltage of ADC by using a DAC.

I tired find theories related abouve questions and found nothing. So I could not do anything to solve these.

 

Hello,

@isurunix , this is the homework section.
Read the following thread:
PLEASE READ - Posting Questions in the Homework Help Forum
We do NOT give full solution here, but only hints to solve the problem.

Bertus

 

@Bertrus

Thanks for pointing it out. Can I post a link to a site containing relevant theories ?
Sorry for my mistake. I was browsing on the same question and most probably for the same home work. So I just hoped to make it easy for him to understand.

 

Hello,

Yes, linking to websites with the theoretical background are fine.

Bertus

 

for code 1 : 15.625 mV

1 V : 1000/15.625

9.140625V = (1000*9.140625)/15.625 = 585

in binary : 1001001001

Do you have any theory notes related to this ?

 

@thar07 You can find the relevant theories here and here

I found them today. These seems to be good. Hope it will help them.

 

for code 1 : 15.625 mV

1 V : 1000/15.625

9.140625V = (1000*9.140625)/15.625 = 585

in binary : 1001001001

This is the Homework Help forum, not the Homework Done For You forum.

Please do NOT just do the poster's assignment for them -- in most cases it does them little good in terms of learning the material.