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AMC1200-Q1: AMC1200BDWV

Gaurav Ingle
Prodigy 60 points
Part Number: AMC1200-Q1
Other Parts Discussed in Thread: AMC1200, AMC3330, AMC1311

Hello TI Team,

I am planning to use this part :AMC1200BDWV for DC voltage sense.

As per datasheet,

The VIN is shorted with GND1 why?

what are the advantages and disadvantages of this connection?

can you elaborate this point? 

Thanks,

Gaurav Ingle.

  • 0
    TI__Guru 50921 points

    Hi Gaurav,

    This is to ensure that the input voltage remains within the common-mode input range of the AMC1200. VINP is then allowed to swing +/-250mV with respect to VINP and GND1. Please note that this connection is not always required, however for most applications it is recommended. 

  • 0 in reply to Alexander Smith
    Prodigy 60 points

    HI Alexander,

    Thanks for your quick response.
    As per above point - i will use above strategy for dc supply because in dc supply +/- 250mV swing isn't require.

    Also, i read the datasheet and came across some point as per below snap from datasheet:

    can elaborate this one?

    Thanks,

    Gaurav I 

  • 0 in reply to Gaurav Ingle
    TI__Guru 50921 points

    Hi Gaurav,

    Can you share a few more details about the application such as accuracy and isolation requirements? 

    How do you plan to power the high side of the AMC1200? 

    Since this is for DC voltage sensing, a device with a larger input range such as and high input impedance would offer higher accuracy. AMC1311 and AMC3330 (integrated DC/DC converter) are good devices to consider. 

    This excerpt is in regards to 4 terminal shunts that offer kelvin connections for current sensing. I assume you would connect the inputs to a standard 2 terminal surface mount resistor and this would not be applicable?