Just multiply the analogRead value by 65536 (assuming you're reading a 16 bit waveform?) - that's all you should need.
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Just multiply the analogRead value by 65536 (assuming you're reading a 16 bit waveform?) - that's all you should need.