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AMC1305M25: what's the influence of different Vclipping?

Yuan Tan63
Expert 3280 points
Part Number: AMC1305M25

Hi,


Customer put forward a question about Vclipping. AMC1305’s Vclipping is 312.5mV, but other part, like AMC1306, AMC120x, avago’s part are all 320mV. why AMC1305 is different?

 

Customer use Vclipping to calculate coefficient(=Vin+Vclipping/2*Vclipping) and then resistor value.

If Vclipping changes, the resistor value should change too and it’s a problem for customer. do you have any explanation on that? 

 

One another thing I want to conform is, why coefficient is calculated by Vclipping while it’s not in linear range?

Thanks.

 

Yuan

  • 0
    TI__Mastermind 47595 points

    HI Yuan,

    The AMC1305 is a different device compared to the AMC1306 and AMC120x, so there are some minor differences between them.

    I would recommend that the customer size the shunt resistor based on linear input range of +/-250mV, and consider using the 250mV-312mV nonlinear range for detecting potential transient events, but not for the actual measurements. 

    This is to ensure that a full scale measurement of +/-250mV is correct and not actually clipping. At 250mV the 1's density will be very high, however there will still be an occasional 0. This shows that the measurement is still converting correctly. Without the 250mV-312mV range, the signal chain would not be able to determine between a full scale voltage of 250mV and a clipping voltage above that. 

  • 0 in reply to Alexander Smith
    TI__Expert 3280 points

    Hi Alex,

    thank you.

    if customer used 320mV part before, and he plan to change to AMC1305M25, is there any change they should do? like software and resistor value?

    thanks.

  • 0 in reply to Yuan Tan63
    TI__Mastermind 47595 points

    Hi Yuan,

    They may want to re-size the shunt resistor using ohm's law, V=IR.

    As far as the software goes, I do not anticipate many/if any changes.