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AFE58JD32LP: back-to-back Schottky clamping diodes

yuqi song
Prodigy 20 points
Part Number: AFE58JD32LP

Tool/software:

I am currently designing an ultrasound system using the AFE58JD32LP. In the datasheet, specifically section 9.3.1.6, TI recommends using back-to-back Schottky clamping diodes at the input to limit large overload signals (greater than 6 dB of the linear input signal range).

Could you kindly recommend a Schottky diode model suitable for this application?

Thank you very much for your assistance.

  • +1
    TI__Expert 4835 points

    Max input supported is 710mVpp in LNA gain 15 mode and 360mVpp in LNA gain 21 mode.  So half of it is positive swing. So 355mV and 180mV. You can choose the diode such that its cutoff voltage is less than 6dB overload. 

    Ex: If you are in LNA gain 15 mode , 6dB overload corresponds to +- 710mV .So choose diode whose cutoff voltage is less than 710mV. Please note that it should have the current carrying capacity when signal is overloaded. This max current depends on your input overload voltage and impedance.