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rf52840 saadc vreference

hello Nordic

i work with nrf52840, SDK 16.0

this issue was discussed in the forum but i wish to get a clearer answer

to my understanding (relaying on the saadc example in the SDK), it is possible to have only 2 Vref, one is the internal which is 0.6v and another is the VDD/4

both force me to use gain of 1_6, or 1_4 respectively. 

but, using gain of less then 1, i loos information, like loosing resolution on camera. this is not good for my application, what solution can Nordic offer to measuring 0-3.3v with gain of 1 ?

(i use 14bit resolution, and my sample rate is 32KHz)

(p.s. i added audio and music to the tags of this topic cause i am actually measuring sound)

best regards

Ziv

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