CM6571 Datasheet, PDF (8/63 Pages) C-Media Electronics – USB 2.0 full speed-compliant

4 Applications
 Speakerphone with acoustic echo cancellation
 USB speaker with sound expander and Xear™ sound effect
 Skype TV module with AEC + LDR
 USB headset with ENC
 USB gaming headset with Xear™ sound effect
 iDevice docking with Xear™ sound effect
 Audio boxes
 USB array/beam forming microphone
CM6571
USB Audio Sound Chip
5 Block diagram
USB
PHY
USB
Control
Engine
I2C
EEPROM
IF
RAM(16K)
ROM(18K)
GPIO
SPI IF
UART IF
I2C
MCU
8051
AGC
DSP
5 band EQ
5 band EQ
ADC
DAC
-14 ~ 49dB,
-1dB/step
Initial 20dB
-14 ~ 49dB,
-1dB/step
Initial 20dB
-26 ~ 37dB,
-1dB/step
Initial 0dB
Aux In
DMIC
2 Channel I2S In
Microphone In
Line In
-30 ~ 12dB,
-1dB/step
Initial 0dB
-15 ~ 32dB,
-1dB/step
Initial 20dB
-62 ~ 0dB,
-1dB/step
Initial 0dB
Speaker/ Heaphone
2 Channel I2S Out
SPDIF Out
CM6571 Functional Block Diagram
Revised: Nov. 2012
Page 8 / 63
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