CM6648 Datasheet | C-Media

DESCRIPTION The CM6648 is a USB 2.0 high-speed audio chip with high performance audio codec which is targeting high-end USB type-C headset, microphone and USB-to-3.5mm Jack audio device. It bines stereo DAC and mono ADC, audio interface I2S, control interface I2C, and embedded flash to provide a highly-integrated audio solution. The CM6648 also supports UAC3.0 LPM L1 and is equipped with a stereo low power cap-free Class-G headphone amplifier of 122d B SNR and 96d B THD+N performance, providing longer battery life and Hi-Fi listening experiences. FEATURES - USB 2.0 full-speed and high-speed pliant - USB UAC1.0/2.0 and ADC3.0 with LPM L1 feature - USB human interface device (HID) class 1.1 pliant - Support USB suspend/resume/reset functions - Support control/interrupt/isochronous data transfers - Audio data supports up to 32-bits data length and 384K sampling rate - Embedded 8051 MCU with internal 256KB flash - 2-Ch DAC 122d B SNR; 1-Ch ADC 99d B SNR - Parametric 12 bands (6+6 bands) equalizer shared for playback or record path - Support Crystal-less and external crystal - Supports OMTP and CTIA 4-ring bo jack auto switch and jack detection - Support 4 in-line Google buttons headset detection - Embedded DC/DC switching power regulator from 3.0V~5.5V to 1.8V~2.0V - Ultra-low-power consumption design: 0.4m A @ suspend; 19m A @idle; 26m A @active - CM6648 QFN-48 package (6.5X5mm) BLOCK DIAGRAM USB Interface Control Bus EQs shared for Input or Output path Input ADOL Out L Output Out R ADOL Out L ADOL Out R 4KB SRAM 6 Bands EQ ADC Gain Side Tone 6 Bands EQ 6 Bands EQ DACL1 DACR1...