How to check Analog to digital converter (ZN449E) output

[quris_terris]

how to check that the output of ZN449E analog to digital converter is correct according to input voltage. plz give me the method of confirming the output so that i m sure that outpu is correct binary of given input

 

[Kral]

The Z449 can be connected as either a unipolar or bipolar device. It can also be configured for two different inut voltage ranges.
.
For Unipolar operation, the outputs should be as follows (Assume the MSB has a weighting of 0.5):
Binary out = (Vin/VinMax
For example, for a 10 V range, and an input voltage of 3.75V (.375 * 10), the binary output should be 0.375.
Bit 7 0 .500 Weighting (MSB)
Bit 6 1 .250 Weighting
Bit 5 1 .125 Weighting
Bit 4 0 .0625 Weighting
Bit 3 0 .03125 Weightin
Bit 2 0 .015625 Weighting
Bit 1 0 .0078125 Weighting
Bit 0 0 .00390625 Weighting (LSB)
Sum = 0.25 + 0.125 = 0.375
.
For Bipolar operation, the MSB has a weighting of -1. The 2nd MSB has a weighting of +.5, the 3rd MSB has a weighting of +.25, etc
For example, with a 10 V full scale, and an input of -4.53125V, the output would be:
Bit 7 1 -1Weighting (MSB)
Bit 6 1 .5 Weighting
Bit 5 0 .25 Weighting
Bit 4 0 .125 Weighting
Bit 3 0 .0625 Weighting
Bit 2 1 .03125 Weighting
Bit 1 1 .015625 Weighting
Bit 0 0 .0078125 Weighting (LSB)
Sum = -1 + .5 + .03125 + .015625 = -.453125

The easiest way to convert from decimal fractions to binary fractions is with a scientific calculator that has Binary or Hex mode.
.
Put the calculator in decimal mode, and enter the decimal fraction.
Multiply the decimal fraction by the binary full scale (in this case X 256).
Place the calculator in binary or hex mode.
Read the binary or hex fraction directly.

 

[power-twq]

if the ADC has 8 bits output,

you can apply input voltage equal to:

0v

1/2 maximal input

maximal input

to verify that if the output is

00000000

10000000 or 01111111

11111111


best regards

how to check that the output of ZN449E analog to digital converter is correct according to input voltage. plz give me the method of confirming the output so that i m sure that outpu is correct binary of given input