Using high speed PWM it is possible to generate an acceptable audio output from an LPC1114. The circuit above samples the audio input and drives an output speaker using PWM. The PWM and sampling frequency are both set to 48MHz/1024 or 46875Hz and resolution is 10bits. More details can be found here:
http://eleceng.dit.ie/frank/arm/BareMetalLPC1114/analogio/index.html
ioprog 