Best Single Chip USB Audio Controller for PC Entertainment
CM102-A/102S USB 2CH Audio Controller
Data Sheet
Version 1.4
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
CM102-A/102S
Integrated 2 Channel USB Audio Controller
Date: 05/21/2003 Version: 1.4
- 1 -
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*
CM102-A/102S
Integrated 2 Channel USB Audio Controller
Date: 05/21/2003 Version: 1.4
- 2 -
1.DESCRIPTION AND OVERVIEW
CM102 series is a highly integrated single chip for USB speaker application. Minimum external
components are needed for building an USB speaker system, which makes CM102-A/S a simple and
very cost-effective solution. Since no driver is necessary for audio playback on all major OS;
CM102-A/S provides a truly plug-and-play feature for external digital audio playback. For energy
saving, USB suspend mode and resume is supported by CM102-A/S. With power amplifier enable pin
and volume control VR input pin, a traditional speaker front panel design can be built. 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 Real Time Content Encoder (AC-3) software value added
Software Xear 3D Sound Technology With HRTF 3D, EAX
TM
, Speaker Shifter and Virtual
5.1CH effects
CM102-A/102S
Integrated 2 Channel USB Audio Controller
Date: 05/21/2003 Version: 1.4
- 3 -
PIN DESCRIPTIONS
CM102-A/102S
PIN #
Signal Name
PIN #
Signal Name
1 PAEN 10 TEST
2 GPIO 11 VREF
3 XO 12
VOLADJ
4 XI 13
AVDD
5 DVDD1 14 LOL
6 DVDD2 15 LOR
7 USBDP 16 AVSS
8 USBDM 17
SPDIF
Out
9 DVSS 18 PDSW
Figure 1. Pin Assignments (Top View)
CM102-A/102S
Integrated 2 Channel USB Audio Controller
Date: 05/21/2003 Version: 1.4
- 4 -
Pin # Symbol Type
Description
1 PAEN DI,
PD
Power amplifier enable;
H normal mode, L power down power amplifier
2 GPIO
DIO,
PD
GPIO pin, default is input mode after reset; accessible
by USB vendor specific request
3
XO
AO
Clock output pin for 12MHz oscillator
4
XI
AI
Clock input pin for 12MHz oscillator
5
DVDD1
P
5V digital power
6 DVDD2 P
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.
7
USBDP
AIO
USB data D+
8
USBDM
AIO
USB data D-
9
DVSS
P
5V digital ground
10 TEST DI,
PD
Test mode select pin; pull low in normal mode
operation
11 VREF AO
Connect to external decouple capacitor for embedded
bandgap
12 VOLADJ AI
0 ~ 2.25V input for volume adjustment by external
VR; pull high to disable VR volume adjustment
function
13
AVDD
P
5V analog power
14
LOL
AO
Line out left channel
15
LOR
AO
Line out right channel
16
AVSS
P
5V analog ground
17 SPDIF
Out
DO SPDIF
Out
18 PDSW
DO,
4mA
Power down switch control
1: normal mode, 0: power down mode
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
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