CM108AH Datasheet, PDF (6/27 Pages) C-Media Electronics – Highly Integrated USB Audio I/O Controller

CM108AH
Highly Integrated USB Audio I/O Controller
3.3 Pin Signal Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
Symbol
SPDIFO
DI
DO
SK
CS
MUTER
PWRSEL
XI
XO
MODE
N.C.
LEDO
GPIO3
DVSS1
GPIO4
SDIN
ADSCLK
MUTEP
ADLRCK
ADMCLK
LEDR
ADSEL
TEST
AVSS1
VBIAS
VREF
MICIN
N.C.
AVDD1
LOL
LOBS
LOR
AVSS2
Type
DO, 8mA, SR
DIO, 8mA,
PD, 5VT
DO, 4mA, SR
DO, 4mA, SR
DO, 4mA, SR
DI, ST, PU
DI, ST
DI
DO
DI, ST
Description
SPDIF output
EEPROM interface data read from EEPROM
EEPROM interface data write to EEPROM
EEPROM interface clock
EEPROM interface chip select
Mute recording (edge trigger with de-bouncing)
Chip power select pin, worked by MODE Pin
Speaker mode – H: 100mA self-powered
L: 500mA Bus-powered
Headset mode – H: 100mA Bus-powered,
L: 500mA Bus-powered
(H: push up to 3.3V, L: push down to ground)
Input pin for 12MHz oscillator
Output pin for 12MHz oscillator
Operating mode selection
H: speaker mode - playback only
L: headset mode - playback & recording
(H: push up to 3.3V, L: pull down to ground)
DO, SR, 8mA
DIO, 8mA,
PD, 5VT
P
DIO, 8mA,
PD, 5VT
DIO, 8mA,
PD, 5VT
DIO, 4mA, SR
DI, ST, PU
DO, 4mA, SR
DIO, 4mA, SR
DO, SR, 8mA
DI, ST, PD
DI, ST, PD
P
AO
AO
AI
LED operation light: output H for power on, toggling for data transmit
GPIO pin
Digital ground
GPIO pin
ADC I2S data input
ADC I2S serial clock
Mute playback (edge trigger with de-bouncing)
ADC I2S left/right clock
11.2896MHz output for 44.1KHz sampled data and
12.288MHz output for 48KHz sampled data
LED for mute recording indicator, output H when recording is muted
ADC input source select pin
H: use external (via I2S) ADC
L: use internal ADC
(H: push up to 3.3V, L: push down to ground)
Test mode select pin,
H: test mode
L: normal operation
(H: push up to 3.3V, L: push down to ground)
Analog ground
Microphone bias voltage supply (4.5V), with small driving capability
Connecting to external decoupling capacitor for embedded bandgap
circuit, 2.25V output
Microphone input
P
5V analog power for analog circuit
AO
Line out: left channel
AO
DC 2.25V output for line out bias
AO
Line out: right channel
P
Analog ground
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