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PGA308: +/- 2.5V input

Hiroshi Sato
Expert 2590 points
Part Number: PGA308

Hello,

Our customer want to use PGA308 witn +/-2.5V(max)input voltage range,

they think this is acceptable to connect GND pin to -5V power supply and connect Vs to 5V power supply.

Is there any problem ?

Thanks,

Hiro

  • 0
    TI__Mastermind 27715 points

    Hello Hiro-san,

    The absolute maximum total power supply voltage to the PGA308 is 5.5 V. The power supply your customer wants to use would create a total of 10V, which exceeds the absolute maximum rating and will damage the device.

    Also keep in mind that all the digital circuitry in the PGA308 is referenced to the same voltage as the GND pin. If the customer would connect GND to a negative voltage, the digital communication signal applied would also need to be referenced to the same negative voltage. This is not recommended.

    The PGA308 is designed to be used in single-supply systems with a power supply of up to +5.5V and ground (0V), where the input voltage is generated by a bridge sensor. Most bridge sensors inherently create a differential input signal with a common mode voltage of mid-supply, so no extra care is needed for the input biasing.

    Best regards,

    Ian Williams
    Applications Engineer
    Precision Amplifiers

  • 0 in reply to Ian Williams
    Expert 2590 points

    Hello Ian-san,

    I'm sorry for my late replying.

    Thank you for your comment and I understand.

    So, I'll explain that to the customer. 

    Thanks and best regards,

    Hiro