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LMH32404: Reverse input current direction

Sariel Hodisan
Prodigy 105 points
Part Number: LMH32404

Hello,

Can the LMH32404 have its input current signal sourced by a photodetector (instead of being sinked)?

In other words:

Can the LMH32404 support input current flowing into the device by connecting the VCC to 0V and the GND to -3.3V ?

Thanks

Sariel

  • 0
    Guru 270260 points

    Section 7.1 of the datasheet says:

    The LMH32404 device is designed to work with photodiodes (PDs), for example avalanche photodiodes (APDs), connected in configurations that can source or sink the current. When the photodiode sinks the photocurrent (anode is biased to a negative voltage and cathode is tied to the amplifier input) the fast recovery clamp activates when the amplifier input is overloaded. When the photodiode sources the photocurrent (cathode is biased to a positive voltage and anode is tied to the amplifier input) a soft clamp activates when the amplifier input is overloaded. When the soft clamp activates the amplifier takes longer to recover.

  • +1
    TI__Expert 6050 points

    Hi Sariel,

    I agree with Clemens answer. Please see my response on this E2E Thread

    Thanks,

    Nick