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LM96551 Does the 1MHz Min Frequency Apply?

Hi,

Looking at using LM96551 in an industrial ultrasound application.

We want to use it with low frequency ultrasound (40Khz - 100Khz). 

The datasheet for LM96551 says minimum frequency is 1Mhz, but given that we are toggling to input pins (as opposed to some internal PLL), does the 1MHz frequency really apply?

What would happen if we used the device slower?

Thanks

Stomp!