You are right
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No I am making my own pcb with atmega32 
Are you suggesting that you will power the ATmega32U4 chip + an ACS712 sensor from an LT1461 voltage reference chip?
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Then why not make your own current sense circuit rather than using some board like the ACS724
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Yes exactly..
How is that please, I thought a dedicated sensor will be much better than any circuit I could do!
I would use the AD8418 current sense amplifier but if you want to use the ACS724 board with the LT1416 it's up to you. Just thought if you are going to make a PCB, you might as well include the current sense circuit on it, your choice
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I am interested , please elaborate on the AC current sense circuit
The ACS724 with +-2.5A , 800mV/A is pretty scarce and can't be found.
I was wondering if the 5A 800mV/A can still work on AC.
ACS724LLCTR-05AU-T
No it won't. You would have to use the ACS724LLCTR-05AB which can go +/-5A but the resolution and accuracy is cut in half.
Here is the AD8418
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Thank you very very much , I really appreciate your help..
Do you think this can perform better or close to the ACS724 800mV/A?
Much bettor. The biggest contributor to error are the two 0.5% resistors but a 1A that's only a +/- 5mA error
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Am I missing something or wouldn't the G=20 mean that you need a 50mOhm resistor for R1||R2?
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You haven't revealed what your production schedule is but if you can wait until the middle of June for parts you could prototype immediately with a breakout board from someone like Pololu.
I think the AD8418 is a better choice though.
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Mouser has over 5000 of the ICs and pololu has 74 of the boards
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I think it's the ACS724LLCTR-2P5, +-2.5A, variant that is currently out of stock(at Mouser).
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I'm going crazy, don't know what I was looking at
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This thread will do that to you. 
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I'm done for today.
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