1.8 V to 3.3 V 1.8 V to 2.5 V 1.8 V to 2.5 V MUX Serial Audio Input Serial Audio Output Signal Processing Engine Multibit Modulator MUX PCM Serial Interface Reset Level Translator Hardware Mode or I2C & SPI Software Mode Control Data BEEP Generator 1.8 V to 2.5 V Switched Capacitor DAC and Filter Headphone Amp - GND Centered Left HP Out Switched Capacitor DAC and Filter Headphone Amp - GND Centered Right HP Out Charge Pump ALC Volume Controls High Pass Filters Register Configuration ALC Multibit Oversampling ADC MUX PGA Multibit Oversampling ADC MUX PGA Stereo Input 1 Stereo Input 2 MUX +32 dB Stereo Input 3 / Mic Input 1 & 2 +32 dB MIC Bias