ADMP401 MEMS microphone breakout board

hi , i am doing a project on voice recording so for this i brought ADMP401 MEMS microphone breakout board i have connected this board as Vcc to 3.3. volts, GND to GND, AUD to A0 of arduino mega
i have used analog read voltage program to see the out put of board it showing 0.00,0.12,0.23… on serial comm port
i thing i am suppose to get the voltages level is 0-3.3 volts with 1.7 as a base voltages
please reffer the code

output is

0.16
0.13
0.10
0.07
0.04
0.02
0.00
0.00
0.00
0.00
0.00
0.00
0.25
0.08
0.00
0.10
0.15
0.00
0.05
0.20
0.00
0.00
0.23
0.00
0.00
0.25
0.02
0.00
0.25
0.08
0.00
0.10

analog.ino (438 Bytes)

Do you have a spec sheet for the Mic board? It should give you some idea of the output voltage range. Far better to hook this to an oscilloscope to check how it behaves over the volume levels you will be using. But you have not at all explained what your purpose is here, so nobody can tell you whether hooking the mic output to A0 is going the accomplish your goals.

i will explain clearly , my project is to record a voice samples ( frequency range 300-3.5 KHz) using a microphone and store it in SD card in a .wav format, so i got APC Digital voice recording project link (http://apcmag.com/arduino-projects-digital-voice-recorder-part-2.htm/) i fallowed every step but i got stuck at microphone amplificcation circuite it goes to Analog port of the arduino A5(i have checked with my Headphones which is having in built microphone as said in above APC project but it didnt work for me)
i could see the wav files in SD card but no sound

then i brough ADMP401 MEMS microphone for connecting to arduino analog port A5
i have attached DATA sheet plese check and recorded wav file also

ADMP401.pdf (641 KB)