CM9901：
CPU
32-bit DSP, 160MHz ,
One channels 16-bit ADC , SNR >= 90dB
Sampling rates of
8KHz/11.025KHz/16KHz/22.05KHz/24KHz/
32KHz/44.1KHz/48KHz are supported
One analog MIC amplifier, build-in MIC bias
generator Supports cap-less, single-ended, and differential mode at the DAC path

Peripherals
Full speed USB 2.0 OTG controller Three full-duplex basic UART, UART0 and UART1 supports DMA mode 10-bit ADC for analog sampling External wake up/interrupt on all GPIOs

PMU
Low voltage LDO for internal digital and analog circuit supply 3uA current consumption in the soft-off mode Built-in LDO for the core, I/O and flash
VCC is 2.2V to 5.5V
VDDIO is 2.2V to 3.6V

应用市场：
USB麦克风，USB声卡