CM6571 Datasheet, PDF (10/63 Pages) C-Media Electronics – USB 2.0 full speed-compliant

CM6571
USB Audio Sound Chip
6.2 Pin description
Pin #
Symbol
32
XTAL_O
31
XTAL_I
88
D_CLK_IN
37
USB_DM
36
USB_DP
42
DV50
40
VCC18IO
41
XV33
10
GND18IO/GND3IO
33
GND18IO/GND3IO
81
GND18IO/GND3IO
75
AV50
50
AGND
65
AGND
72
AGND
74
XV35_DAC
67
XV35_ADC
71
XV35_DRIVER
34
D_XV24_DA
35
D_AGND
43
D_AVDD
39
D_XVREF
46
D_DVDD
47
D_XV1.2
49
D_DGND
52
XACREFL/XACREFR
53
XMICL
56
XMICR
57
XLINL
58
XLINR
60
XMICBIAS2
61
XMICBIAS1
62
XVAG
68
XVOLADJ
69
XLNOUTL
70
XLOCOM
73
XLNOUTR
21
D_AUXIN_P
22
D_AUXIN_N
23
D_MIC1_N
24
D_MIC1_P
44
D_MIC0_N
45
D_MIC0_P
76
DAC_MCLK
I/O
AO
AI
DI, PD
Description
Clock
12MHz crystal oscillator output
12MHz crystal oscillator input
Clock input (default 26MHz, configurable for 1~31MHz)
USB 2.0 BUS Interface
AIO USB 2.0 data negative (USB D- signal)
AIO USB 2.0 data positive (USB D+ signal)
Power/Ground
PWR 5V digital power for 5/3.3 regulator
AO 1.8V power for digital I/O and core
AO Regulator 3.3V output, drive capacity 150mA for USB and digital I/O
GND Digital ground
GND Digital ground
GND Digital ground
PWR 5V analog power for 5/3.5 regulator
GND Analog ground
GND Analog ground
GND Analog ground
AO Regulator 3.5V output, drive capacity 100mA for analog and amplifier
AO 3.5V power for ADC and voltage and current reference
AO 3.5V power for driver
AIO Regulator capacitor filter for analog circuit
GND Analog ground
PWR Analog power
AO Voltage reference capacitor filter
PWR Digital power
AIO Regulator capacitor filter for digital and PLL circuit
PWR Digital ground
Audio Interface
AO Common reference voltage for input signal
AI Mic in: left channel
AI Mic in: right channel
AI Line in: left channel
AI Line in: right channel
AO Microphone bias, 2.75V
AO Microphone bias, 2.75V
AO Voltage reference cap filter
AI Analog control voltage input for playback volume control
AO Line out: left channel
AO Line out: common reference for capless connection
AO Line out: right channel
AI Differential analog aux line input P
AI Differential analog aux line input N
AI Differential analog microphone 1 input N
AI Differential analog microphone 1 input P
AIN Differential analog microphone 0 input N
AIN Differential analog microphone 0 input P
2-channel I2S DAC Interface
DO
I2S master clock
Programmable 3.3V output buffer
Revised: Nov. 2012
Page 10 / 63
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