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STM32F103 ADC clock on DocID13587 Rev 17 is right ?

Question asked by embedholic on Oct 8, 2016
Latest reply on Oct 8, 2016 by embedholic
http://www.st.com/content/ccc/resource/technical/document/datasheet/33/d4/6f/1d/df/0b/4c/6d/CD00161566.pdf/files/CD00161566.pdf/jcr:content/translations/en.CD00161566.pdf
page 12 
3. To have an ADC conversion time of 1 µs, APB2 must be at 14 MHz, 28 MHz or 56 MHz.
Is this right information ?
If APB2 is 40Mhz , adc clock prescale = 2(div 2) and sampling time 7.5 , then Tconv=20 clocks at 40Mhz. (40Mhz / 2 / 20 = 1 Mhz)
In this case, conv time is 1us as well.

Am i missing somethihg ?

Thanks.

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