Scaling to a 12-bit ADC value

typical:

Vin = Vref : Out = xFFF
Vin = 0    : Out = x000

Vin = Rshunt * I

Out = Vin * (xFFF / Vref)

Lothar M. wrote:
> But the slope of this calculation is 1/4096 wrong.

right :-)

Lothar M. wrote:
> First question:
> Is your question related to FPGA, Verilog or VHDL?
> If so: how?
>
Yes, I want to implement the scaling in VHDL
> Wil wrote:
>> Any suggestions?
> What hardware?
>
Altera Cyclone IV
>> But I am also not familiar reading from a ADC data sheet to find the
>> approximate 12bit value for an input voltage/current.
> What ADC?
>
LTC1407 12bit ADC

>> For example take a 1V=4A value
> So you have a "device" that forms 1V out of 4A, meaning 2A result in
> 0.5V?
Yes, A Dual Op_Amp gives out 1V=6A (seeing from the layout)

Schlumpf wrote:
> typical:
>
> Vin = Vref : Out = xFFF
> Vin = 0    : Out = x000
>
> Vin = Rshunt * I
>
> Out = Vin * (xFFF / Vref)

So here to get a 12 bit value, Should I just consider Vin=1V 
(irrespective out of the 4A i.e. 1v=4A ?).

Or do I need to calculat the correspoding voltage for 4A? (V= 4*Rshunt) 
How do I find Rshunt from the datasheet?

The datasheet for LTC1407 says Vref=2.5V.

So for Vin=1 Out should be 1638.