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MPY634 strange behaviour

Ronie Adhiraaj Ghosh
Prodigy 140 points

Other Parts Discussed in Thread: MPY634

I have wired MPY634 as divider as given in datasheet. But with this config when denominator part is 0 then output goes in saturation(quite obvious). Now if I open Y1 trim and put it to ground then offset is there when inputs have some signals. And if I keep it float then at pin Y1 voltage shows 2.4 Volts. Why is it happening? Is my chip fried?

  • 0
    TI__Guru* 93105 points

    Hi Ronnie,

    I do not think the MPY634 is not being fried when you float the Y1 pin. The Y inputs are connected to sources that provide current to the multiplier core. The Y1 pin, as shown in Figure 4, is intended to be connected to either ground, or a bias voltage, but not to float.

    If the pin floats it simple disconnects the source's base and the voltage is some residual level resulting from the disconnected condition. If normal operation is regained after reconnecting the Y1 input to ground, or the bias level, I believe it will still be okay.

    I don't recommend operating any IC in an unconventional connection because it might result in damage.

    Regards, Thomas

    PA - Linear Applications Engineering