Convert Voltage values to Decimal values.

[balan12]

I need to convert voltage values/range to decimal values/range.

Example: I read voltage (range 0 to 1.0volts) form DAC and covert it corresponding decimal value (decimal value range is 0 to 16000).

0 decimal = 0 volts

16000 decimal = 1.0volts.

Thanks for the help.

[Charles_CLA]

Calculate the VLSB (voltage of the least significant bit) and multiply the DAC response by that. (VRefHigh - VRefLow) / Number of Bits, or in your case (1 - 0)/16000 = 0.0000625. So take your read back from the DAC times 0.00625. I'm curious though, 16,000 is an odd number for a DAC, they are usually a power of 2 like 2^14 (16,384). What kind of DAC do you have?

[balan12]

Thank you for your quick reply.

We are using LTC 2620. For now, we will be using the values up to 16000.

Thanks Again.

[Charles_CLA]

I'm not sure how you'd get a value of 16000 out of the 2620 as that is only a 12-bit DAC that will produce values from 0 to 4095. Here's the transfer function directly copied from page 12 of Linear's datasheet.

[balan12]

Sorry for the typo. It is LTC 2600.

[crossrulz]

The LTC 2600 is a 16-bit DAC.  So the max value is really 65535.  But that is from 0 to 5V.  With that rational, 1V should be 13107.

[balan12]

We need fine tuning down to mVolts.

[Charles_CLA]

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@crossrulz wrote:

But that is from 0 to 5V

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The Ref is an external pin and can be wired to whatever reference he has available, which leads me to believe that his reference is set to 4.096 volts.