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ADC in LPC2148 works on more than 4.5MHz whereas it is not supposed to according to the user manual

Hello

The ADC in LPC2148 operates at 4.5MHz or less according to the user manual(UM10139) provided.
But from what I experienced, the ADC gives the output upto 15MHz.

I set the System clock at 60MHz using PLL. Also in the ADC control register using the CLKDIV bits I have to divide the system clock with the appropriate value such that the frequency becomes less than or equal to 4.5 MHz. But even if it is more than 4.5MHz, it gives output till I set the clock to 15MHz.

Am I missing something that I need to know here or the LPC2148 works this way?

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