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AMC1301: AMC1301 - TIDA-00912 Supply

Patrik Resutik
Prodigy 60 points
Part Number: AMC1301
Other Parts Discussed in Thread: TIDA-00912, , OPA2376

Hello, i would like to ask, why in TIDA-00912 reference manual, the high side of the AMC1301 is powered by +-2,5V ? When the input accepts voltages +-250mV ? 

Can someone explain, so i can better understand ? 

Thank you in advance.

  • 0
    TI__Expert 3550 points

    Dear Patrik,

    thank you for your interest in the TIDA-00912 and the AMC1301. 

    The AMC1301 is powered from a bipolar supply. The AMC1301 GND1 is connected to -2.5V and VDD1 is connected to +2.5V. This gives an effective 5V supply between VDD1 and GND1 or AMC1301.

    The GND of the bipolar +2.5V and -2.5V supply is referenced to the floating GND of the shunt. The common mode voltage of the OPA2376 output is slightly above 0V, and hence exactly in the middle of the AMC1301 supply voltage.

    We have a complete TINA Spice simulation file in the TIDA-00912 design folder www.ti.com/tool/tida-00912. You can directly access from here: https://www.ti.com/lit/zip/tidm003. 

    Regards,
    Martin Staebler