ADL5205 Maximum input voltage swing

Hello,

I'm using the ADL5205 for a new design.

I have a doubt regarding the Maximum Input Swing of the ADL5205. While in page 3 of the datasheet specifies that the Maximum Input Swing is 8Vpp, in the absolute maximum ratings of page 6, the datasheet states that the Differential Input Voltage ((VINx+) − (VINx−)) is +-1V. Both informations seem contradictory. ¿What is the true maximum input swing?

My concern is about the maximum input level that the device can tolerate without damage (it doesn't matter if it is in linear operation or saturated) for the whole range of gain codes.



Thank you.

Joan Ramon

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  • The “Maximum Input Swing” of 8 Vpp on page 3 is for the lowest gain setting of -9 dB. Then as the gain is increased, the Maximum Input Swing has to be reduced correspondingly to maintain the same maximum output swing.

    As for the “Differential Input Voltage” in the Absolute Maximum Ratings table on page 6, that takes effect starting around 14 dB of gain and up. At that point, there’s no more resistive attenuation on the input, so whatever signal is presented on the pins that will directly go on an input ESD protection circuit, which is the reason the input signal swing has to be limited.

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  • The “Maximum Input Swing” of 8 Vpp on page 3 is for the lowest gain setting of -9 dB. Then as the gain is increased, the Maximum Input Swing has to be reduced correspondingly to maintain the same maximum output swing.

    As for the “Differential Input Voltage” in the Absolute Maximum Ratings table on page 6, that takes effect starting around 14 dB of gain and up. At that point, there’s no more resistive attenuation on the input, so whatever signal is presented on the pins that will directly go on an input ESD protection circuit, which is the reason the input signal swing has to be limited.

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