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Use the PCM2904 or PCM2902 Burr Brown codec from TI.
This is a USB audio device with stereo mic input and line level stereo audio output. It uses Winows drivers so you dont have to worry about writing WDM.
Incorporates USB Audio Controller
• USB Serial Interface Engine
• Audio Class Encoder/Decoder
• 2 Endpoints (FIFO)
• USB transceiver
16 bit A/D Converter
• 1 channel
• Mute/Volume Control
• AGC pin for external control
• 5 Sampling Frequencies support 8kHz, 11.025kHz, 22.05kHz, 44.1kHz, 48kHz
Programmable Gain Amplifier: +20dB to ｬ58dB
Single Power Supply, Low Power: +3.3Volts±10%
Package: 24-pin VSOP