Best Single Chip USB Audio Controller for PC Entertainment
CM101S USB Audio Controller
Datasheet
Version 1.1
C-MEDIA ELECTRONICS INC.
TEL: 886-2-8773-1100 FAX: 886-2-8773-2211
6F, 100, Sec. 4, Civil Boulevard, Taipei, Taiwan 106, R.O.C.
For detailed product information, please contact
sales@cmedia.com.tw
CM101S
USB Audio Controller Integrated Dolby Digital Sound Solution
NOTICES
THIS DOCUMENT IS PROVIDED “AS IS” WITH NO WARRANTIES WHATSOEVER, INCLUDING
ANY WARRANTY OF MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR ANY
PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY
PROPOSAL, DOCUMENT OR SAMPLE.
ALL RIGHTS RESERVED. NO PART OF THIS DOCUMENT MAY BE REPRODUCED OR
TRANSMITTED IN ANY FORM OR BY ANY MEANS, ELECTRONIC OR MECHANICAL,
INCLUDING INFORMATION STORAGE AND RETRIEVAL SYSTEMS, WITHOUT PERMISSION
IN WRITING FROM THE C-MEDIA ELECTRONICS, INC.
Third-party brands and names are the property of their respective owners.
Copyright 2002-2003 © C-Media Electronics Inc.
*C-Media reserves the right to modify the specifications without further notice*
Date: 05/28/2003
-1-
Version:
1.1
CM101S
USB Audio Controller Integrated Dolby Digital Sound Solution
1.DESCRIPTION AND OVERVIEW
CM101S is a highly integrated single chip for multimedia USB audio application. For traditional stereo audio
source playback, no additional driver is required on all mainstream OSs, making it a truly plug-and-play audio
device. For value added applications, C-Media provides driver and software to replace the standard USB audio
driver; features including Dolby Digital Real-Time AC-3 encoding, global reverberation, equalizer, Sensaura 3D
sound, boost gain with AGC, and virtual speaker (Xear). For energy saving, USB suspend mode and resume is
supported by CM101S. More flexible and customized design is possible with GPIO pin, which is accessible by
USB vendor specific request.
Features
USB 2.0 Full Speed Compatible
USB audio device class specification v1.0 Compatible
USB bus powered 500mA operation with suspend mode support
Single 12MHz crystal input with on-chip PLL and embedded USB transceiver
USB audio function topology has 1 input terminal, 1 output terminal, and 1 feature unit
Alternate zero bandwidth setting for releasing bandwidth on USB bus during inactive operation
Isochronous transfer using adaptive synchronization with internal PLL
High performance 48KHz sampling rate for audio playback
Embedded high performance 16 bit audio DAC
Embedded class AB power amplifier for speaker driving
Embedded power on reset block and Power amplifier enable / disable control pin
Volume control input with simple external VR circuit
GPIO pin for application specific usage
S/PDIF output interface
Single 5V external power supply with internal power regulation
3.3V IO with 5V tolerance; 3.3V core logics design
Compatible with Win 98SE / Win ME / Win 2000 / Win XP, and Mac OS 9 / OS X without
additional driver
Compact 18 pin SOP package
Target application: multimedia USB audio box, decoder integrated, pen driver
Dolby Digital AC-3 Real-Time software Encoder value added
Software Xear 3D Sound Technology With HRTF 3D, EAX
TM
, Speaker Shifter and Virtual
5.1CH effects
Date: 05/28/2003
-2-
Version:
1.1
CM101S
USB Audio Controller Integrated Dolby Digital Sound Solution
PIN DESCRIPTIONS
CM101S
PIN #
1
2
3
4
5
6
7
8
9
Signal Name
PAEN
GPIO
XO
XI
DVDD1
DVDD2
USBDP
USBDM
DVSS
PIN #
10
11
12
13
14
15
16
17
18
Signal Name
TEST
VREF
VOLADJ
AVDD
LOL
LOR
AVSS
SPDIF Out
PDSW
Figure 1. Pin Assignments (Top View)
Date: 05/28/2003
-3-
Version:
1.1
CM101S
USB Audio Controller Integrated Dolby Digital Sound Solution
Pin # Symbol
1
2
3
4
5
PAEN
GPIO
XO
XI
DVDD1
Type
DI, PD
DIO, PD
AO
AI
P
Description
Power amplifier enable;
H – normal mode, L – power down power amplifier
GPIO pin, default is input mode after reset; accessible
by USB vendor specific request
Clock output pin for 12MHz oscillator
Clock input pin for 12MHz oscillator
5V digital power
3.3V voltage from internal regulator for decouple
capacitor connection
It is not affected by power down mode and can be
used to connect USB pull up resistor.
USB data D+
USB data D-
5V digital ground
Test mode select pin; pull low in normal mode
operation
Connect to external decouple capacitor for embedded
bandgap
0 ~ 2.25V input for volume adjustment by external
VR; pull high to disable VR volume adjustment
function
5V analog power
Line out left channel
Line out right channel
5V analog ground
SPDIF Out
Power down switch control
1: normal mode, 0: power down mode
6
DVDD2
P
7
8
9
10
11
USBDP
USBDM
DVSS
TEST
VREF
AIO
AIO
P
DI, PD
AO
12
13
14
15
16
17
18
VOLADJ
AVDD
LOL
LOR
AVSS
SPDIF Out
PDSW
AI
P
AO
AO
P
DO
DO, 4mA
Note: DI – digital input pin , DO – digital output pin, DIO – digital bi-directional pin, P – power pin, PD –
pull down with 100K Ohm resistor, AI – analog input, AO – analog output
Date: 05/28/2003
-4-
Version:
1.1
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