CM101S+ - C-Media Electronics, Inc.

Best USB Audio Single Chip for PC Entertainment

CM101S+

USB 2CH Audio Controller

(Dolby Digital Live Software Technology Bundle)

Datasheet

Version 1.01

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 With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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NOTICES

THIS DOCUMENT IS PROVIDED “AS IS” WITH NO WARRANTIES WHAT SO EVER,

INCLUDING ANY WARRANTY OF MERCHANT ABILITY, NONINFRINGEMENT, FITNESS FOR

ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY

PROPOSAL, DOCUMENT OR SAMPLE.

TRANSMITTED IN ANY FORM OR BY ANY MEANS, ELECTRONIC OR MECHANICAL,

INCLUDING INFORMATION STORAGE AND RETRIEVAL SYSTEMS, WITHOUT

PERMISSION IN WRITING FROM C-MEDIA ELECTRONICS, INC.

UCOPYRIGHT

icons, images, audio clips, digital downloads, data compilations, and software, is either the

exclusive property of C-Media Electronics Inc., its affiliates (collectively, "C-Media"), its content

suppliers, or its licensors and protected by Republic of China and international copyright laws.

UTRADEMARKS

C-Media, the C-Media Logo, Xear 3D, Xear 3D Logo and Speaker Shifter are trademarks of

C-Media Electronics Inc. in Republic of China and/or other countries. Dolby Digital and dts are

trademarks of Dolby Laboratories, Inc. and DTS Corporate. and All other brand, logos and

product names listed are trademarks or registered trademarks of their respective holders and are

hereby recognized as such.

*C-Media reserves the right to modify the specifications without further notice*

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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TABLE OF CONTENTS

1. DESCRIPTIONS AND OVERVIEW 5

2. FEATURES 5

3. PIN/SIGNAL DESCRIPTIONS 7

3.1 PIN ASSIGNMENT BY PIN NUMBER 7

3.2 PIN-OUT DIAGRAM 7

3.3 PIN SIGNAL DESCRIPTIONS 8

4. BLOCK DIAGRAM 9

5. ORDERING INFORMATION 10

6. FUNCTION DESCRIPTIONS 11

6.1 USB INTERFACE 11

6.1.1 DEVICE DESCRIPTOR 11

6.1.2 CONFIGURATION DESCRIPTOR 12

6.1.3 USB AUDIO TOPOLOGY DIAGRAM 12

6.2 DOLBY DIGITAL LIVE TECHNOLOGY 13

6.3 DYNAMIC RANGE CONTROL (DRC) 13

7. ELECTRICAL CHARACTERISTICS 16

7.1 ABSOLUTE MAXIMUM RATING 16

7.2 OPERATION CONDITIONS 16

7.3 SPERKER IMPEDANCE VS. OUTPUT POWER (PER CHANNEL) 17

7.4 AUDIO PERFORMANCE 17

8. AUDIO PERFORMANCE CURVES 19

8.1 FREQUENCY RESPONSE (10K OHM LOADING) 19

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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8.1.1 FREQUENCY RESPONSE @ 44.1 KS/SEC 19

8.1.2 FREQUENCY RESPONSE @ 48 KS/SEC 19

8.2 PASSBAND RIPPLE (10K OHM LOADING) 20

8.2.1 PASSBAND RIPPLE @ 44.1 KS/SEC 20

8.2.2 PASSBAND RIPPLE @ 48 KS/SEC 20

9. REFERENCE APPLICATION CIRCUIT 21

10. REFERENCE 22

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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1. DESCRIPTIONS AND OVERVIEW

CM101S+ is the world first USB audio chip that with Dolby Digital Live sounds technology

supporting. This new chip design can provided more efficiency features and high quality sound

for portable USB audio products application. It is a highly integrated single chip for USB stereo

audio and SPDIF output application. Minimum external components are needed for building an

USB audio system, which makes CM101S+ a simple and very cost-effective solution.

CM101S+ is design for all kind of PC base USB personal multi-media device products. It is USB

2.0 full speed compatible and utilizes USB bus power for plug-and-play feature. Via C-Media

Xear 3D Sound USB audio driver, users can avail themselves of a much better virtual 7.1 CH

environment capable. For high-end multi-media application, this light and portable personal

audio device can easy to processing any sound source to Dolby Digital AC-3 raw data by

real-time encoding function. The world first innovation software function to grade up every PC

system and output high quality digital sound effects for link up with high-end home theater

equipments like amplifier, DVD player or decoder etc.

This special feature is Dolby Digital Live function modules. As we know, Dolby Digital is the world

well-known sound technology brand and generality using on consumer electronics. Therefore, if

PC products need to be home theater equipment or media center this would be key feature and

selling point for product development. These functions not only provide easy bridge to connect

PCs and consumer electronics but also adding value and upgrade sound quality to PC products.

In the future, PCs can put on Dolby logo on it and provide advanced sound quality to end-user.

All of modules were implemented by C-Media in software technology and anyone can request

these features by license from Dolby Lab. through C-Media.

The world smallest devices for Dolby Digital Live content encoding application.

2. FEATURES

 USB 2.0 Full Speed Compatible and USB IF Certification

 USB audio device class specification v1.0 Compatible

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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 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

 Isochroous transfer using adaptive synchronization with internal PLL

 High performance 16-Bit Stereo, 48 / 44.1 KHz Sampling Rate for Audio Playback

 Embedded high performance 16 bit stereo audio DAC

 Embedded Digital Control Power Amplifier for Speaker Driving

 SPDIF Output Interface

 Support Dynamic Range Control (DRC) Feature to Provide a Better Listen Experience

 Embedded X2 Modulation for Higher Audio Quality

 Embedded Anti-Pop Circuit with Internal Feedback St ructure

 Volume control input with simple external VR circuit

 GPIO pin for application specific usage

 Support Power Amplifier Enable / Disable Control Pin

 Embedded Power-On-Reset Block

 LED Indicator Pin During Playback

 Embedded 5V to 3.3V Regulator with Voltage Level Detector for Single 5V External

Power Supply

 3.3V IO with 5V tolerance; 3.3V core logics design

 Compact 18 pin SOP package

 Dolby Digital Live Software Sound Technology Bundle

 Software Xear 3D Sound Technology With HRTF 3D, EAXTM, Speaker Shifter and

Virtual 7.1CH effects

 USB Software Driver Compatible with Win 98SE / Win ME / Win 2000 / Win XP

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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3. PIN/SIGNAL DESCRIPTIONS

3.1 PIN ASSIGNMENT BY PIN NUMBER

Pin # Signal Name Pin # Signal Name

1 PAEN 10 TEST

2 GPIO 11 VREF

3 XO 12 VOLADJ

4 XI 13 AVDD

5 DVDD5V 14 LOL

6 REGV 15 LOR

7 USBDP 16 AVSS

8 USBDM 17 SPDIFO

9 DVSS 18 PDSW

3.2 PIN-OUT DIAGRAM

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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3.3 PIN SIGNAL DESCRIPTIONS

Pin # Symbol Type Description

1 PAEN DI, ST

Power Amplifier Control Input, Connect to a Switch or

Pull-High in Normal Operation.

H: Enable Power Amplifier (Normal Mode)

L: Disable Power Amplifier

2 GPIO

DIO, 8mA, ST,

SR, PD GPIO Pin, Controlled via Vender Specific Command

3 XO AO Output Pin for 12MHz Oscillator

4 XI AI Input Pin for 12MHz Oscillator

5 DVDD5V P 5V Power Supply

6 REGV AO Regulator Output 3.3V

7 USBDP AIO USB Data D+

8 USBDM AIO USB Data D-

9 DVSS P Digital Ground

10 TEST DI, ST, PD Test Mode Select Pin, Pull-Down in normal Operation

11 VREF AO

Connecting to External Decoupling Capacitor for Embedded

Band gap Circuit; 2.25V Output

12 VOLADJ AI Analog Volume Control Input from external VR circuit.

0 ~ 2.25V: +12 dB ~ 3 dB / mute

3.5 ~ 5V: 0 dB

13 AVDD P 5V Power Supply for Analog Circuit

14 LOL AO Line Out Left Channel

15 LOR AO Line Out Right Channel

16 AVSS P Analog Ground

17 SPDIFO

DO, 8mA, SR S/PDIF Data Output

18 PDSW

DO, 8mA, SR Power Down Switch Control Signal Output

1: Normal Mode

0: Power Down Mode (Suspend Mode)

*NoteU:DI / DO / DIO – Digital Input / Output / Bi-Directional Pad

AI / AO / AIO – Analog Input / Output / Bi-Directional Pad

P – Power Pin

SR – Slew Rate Control

ST – Schmitt Trigger

PD / PU – Pull Down / Pull Up

5VT – 5 Volt Tolerant (3.3V Pad)

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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4. BLOCK DIAGRAM

Block Diagram Of CM101S+

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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5. ORDERING INFORMATION

Model

Number Package Operating Ambient

Temperature Supply Range

CM101S+ 18-Pin PDIP 0 o C to +70 o C DVdd = 5V, AVdd = 5V

Outline of Dimensions Dimensions shown in inches and (mm)

18- Pin SOP

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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6. FUNCTION DESCRIPTIONS

6.1 USB INTERFACE

6.1.1 DEVICE DESCRIPTOR

Offset Field Size Value

(Hex) Description

0 bLength 1 12

Total 18 Bytes

1 bDescriptorType 1 01

Device Descriptor

2 bcdUSB 2 0110

USB 1.1 compliant.

4 bDeviceClass 1 00

5 bDeviceSubClass 1 00

6 bDeviceProtocol 1 00

7 bMaxPacketSize0 1 08

Endpoint Zero Size = 8 bytes

8 idVendor 2 0D8C

Vendor ID

10 idProduct 2 0103

Product ID

12 bcdDevice 2 0010

Device Release Number

14 iManufacturer

1 01

Index of string descriptor describing

manufacturer -> “C-Media INC.”

15 iProduct

1 02

Index of string descriptor describing

product -> "C-Media USB Audio "

16 iSerialNumber

1 00

Index of string descriptor describing the

device’s serial number

17 bNumConfigurations 1 01 Configurations number = 1

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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6.1.2 CONFIGURATION DESCRIPTOR

Offset Field Size Value

(Hex) Description

0 bLength 1 09

Total 9 Bytes

1 bDescriptorType 1 02

Configuration Descriptor

2 wTotalLength

2 008D

Total length of data returned for this

configuration.

4 bNumInterfaces

1 03

Number of interfaces supported by this

Configuration.

5 bConfigurationValue 1 01

6 iConfiguration 1 00

7 bmAttributes 1 80

Self-powered without Remote Wakeup

8 bMaxPower

2 FA

Maximum power consumption of the

USB. 0xFA=500 mA

6.1.3 USB AUDIO TOPOLOGY DIAGRAM

USB streaming

ID = 01 Feature Unit

(Volume) (Mute)

ID = 0D

Speaker

ID = 03

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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6.2 DOLBY DIGITAL LIVE TECHNOLOGY

C-Media Xear 3D™ Sound Solution provides another state-of-the-art high quality audio

function--Dolby Digital Live module. With this real-time software AC-3 encoder, the existing and

future customers who are using C-Media USB audio solution and devices can obtain this digital

quality audio output by S/PDIF format much easier than before. This function can output various

3D and environmental sound effects by high quality AC-3 encoding; in the meantime, it exhibits

supreme efficiency—it takes only 7% of CPU consumption from a Pentium 4 Processor.

Better yet, the pure digital signal not only prevents the audio signal from distortion, but also

reduces the number of wires connected between PC and a HI-FI audio system. That is to say,

this breakthrough real-time AC-3 encoder can digitally transmit data from PC to HI-FI system via

a single RCA cable, instead of three pairs in an analog signal case in the past.

Advantages of this feature：

1.Getting higher quality audio signal output compared with any other SPDIF-Out solutions.

C-Media Xear 3D™ Plus Dolby Digltal Live encoder sound solution can directly process and

transmit any PC sound source to digital AC-3 signal. Digital-transmitted data processed by

software driver can absolutely rule out the characteristics influence of DAC quality. Therefore,

users are able to get the best sound quality.

2.General PC audio SPDIF-Out solution can only provide 2CH PCM data to external amplifier.

If users want to output high quality digital AC-3 bit-stream, they have to rely on software DVD

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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player, from which only DVD playback is achievab le. In that case, it will limit and impair the

high quality multi-channel sound enjoyment. C-Media DDL solution not only ret ains the above

functions, but also provides other possible applications on PC audio. Xear 3D™ plus DDL

sound solution can process any type of sound sources, and people are able to obtain 7.1CH

output by using virtual SPEAKER SHIFTER™ to create optimized personal listening

environment.

3.In terms of 3D gaming, C-Media Xear 3D™ sound engine for real-time AC-3 encoder are far

better than Window DirectX 3D sound emulator, in that it is powered by sophisticated HRTF

(Head Related Transfer Function) library, supporting environmental effects (EAX 1.0 & 2.0

compatible) to create highly immersive 3D gaming experience. All interactive sound effects of

3D game can real-time encoding to AC-3 bit-stream and getting high quality digital signal to

external decoder and speakers for enjoyment.

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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6.3 DYNAMIC RANGE CONTROL (DRC)

CM101S+ include a new feature called Dynamic Range Control (DRC), and with a default ON

setting (Users can still turn it off within the Windows audio advance control panel)

Dynamic range is defined as the difference, in decibels (dB), between the loudest and quietest

sounds in any particular piece of audio content. Classical music is a good example, with ranges

from piano (soft) to forte to FFF (for extremely loud). Movies also typically have a wide dynamic

range, which may cause you to have to turn the volume up and down as scenes change. For

example, when watching a movie at home, you may be forced to turn up volume to hear the

dialog in a quiet scene, and then quickly turn it down again during a car chase scene that follows.

In this way, there may be times in a home theater environment when it would be useful to be able

to control the dynamic range.

With Dynamic Range Control enabled, the full dynamic range (A) of the program is reduced (B).

+10dB

0dB

-10dB

-20dB

-30dB

-40dB

-50dB

-60dB

+20dB

Lower Levels Raised

Peaks Reduced

A

B

DRC

Peaks Reduced

Lower Levels Raised

Peaks Clipped

Lower Levels

hard to heard

A

B

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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7. ELECTRICAL CHARACTERISTICS

7.1 ABSOLUTE MAXIMUM RATING

Symbol Parameter Value Unit

Dvmin Min Digital Supply Voltage – 0.3 V

Dvmax Max Digital Supply Voltage + 6 V

Avmin Min Analog Supply Voltage – 0.3 V

Avmax Max Analog Supply Voltage + 6 V

Dvinout Voltage on any Digital Input or Output Pin –0.3 to +5.5 V

A vinout Voltage on any Analog Input or Output Pin –0.3 to +5.5 V

TBstgB Storage Temperature Range -40 to +125 P

0

PC

ESD (HBM) ESD Human Body Mode 2000 V

ESD (MM) ESD Machine Mode 200 V

Latchup Latch Up Test 200 mA

7.2 OPERATION CONDITIONS

Min Typ Max Unit

Analog Supply Voltage 4.5 5.0 5.5 V

Digital Supply Voltage 4.5 5.0 5.5 V

Total Power Consumption - - 500 mA

Suspend Mode Power

Consumption - - 320 uA

Operating ambient

temperature 0 - 70

P

o

PC

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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7.3 SPERKER IMPEDANCE VS. OUTPUT POWER (PER CHANNEL)

Loading (Ohm)

Items 4 Ohm 8 Ohm 32 Ohm 10K Ohm

Vpp 3.14 3.4 3.635 3.722

Vrms 1.11 1.202 1.285 1.316

W(rms/sin wave) 308 mW 181 mW 52 mW 0.17 mW

W(rms/square wave) 616 mW 361 mW 103 mW 0.35 mW

W(PMPO) 2460 mW 1450 mW 410 mW 1 mW

*Note1: Test Condition @ 25oC, 5 Volt +- 10%

*Note2: Typical Output with THD+N < 1%; Maxi mal Output with THD+N < 10%

7.4 AUDIO PERFORMANCE

Min Typ Max Unit

Resolution -- 16 -- Bits

Frequency response @ 48KHz 20 -- 20K Hz

Frequency Response @ 44.1KHz 20 -- 20K Hz

Passband Ripple @ 48 KHz 40 -- 9.6K Hz

Passband Ripple @ 44.1 KHz 40 -- 8.8K Hz

DAC (10K Ohm Loading)

SNR -- 97.75 -- dB

Dynamic Range -- 96.27 -- dB

THD + N -- -67.97 -- dB

Output Voltage (rms) - 1.316 - Vrms

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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Min Typ Max Unit

DAC (32 Ohm Loading)

SNR -- 97.68 -- dB

Dynamic Range -- 95.99 -- dB

THD + N -- -57.82 -- dB

Output Voltage (rms) - 1.285 - Vrms

DAC (8 Ohm Loading)

SNR -- 97.67 -- dB

Dynamic Range -- 96.03 -- dB

THD + N -- -53.28 -- dB

Output Voltage (rms) - 1.202 - Vrms

DAC (4 Ohm Loading)

SNR -- 97.45 -- dB

Dynamic Range -- 95.89 -- dB

THD + N -- -52.76 -- dB

Output Voltage (rms) - 1.11 - Vrms

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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8. AUDIO PERFORMANCE CURVES

8.1 FREQUENCY RESPONSE (10K OHM LOADING)

8.1.1FREQUENCY RESPONSE @ 44.1 KS/SEC

C-MEDIA 05/31/05 14:10:33Digital Playbac k (PC-D-A) fo r Line Outp ut Fre quenc y

Response

WL-Multitone-44k.at2c

ColorSweep Trace Line Style Thick Data Axis C omment

1 1 Cyan Sol id 3 Fasttest.Ch.1 Ampl !Nor malize Left

1 2 Yellow Solid 3 Fasttest.Ch.2 Ampl!Normalize Left

-6

+1

-5

-4

-3

-2

-1

+0

d

B

r

A

20 10k50 100 200 500 1k 2k 5k

Hz

8.1.2 FREQUENCY RESPONSE @ 48 ks/sec

C-MEDIA 05/31/05 14:07:22Digital Playbac k (PC-D-A) fo r Line Output Frequenc y

Response

WL-Multitone-48k.at2c

ColorSweep T race Line Style Thick Data Axis Comment

1 1 Cyan Solid 3 Fasttest.Ch.1 Ampl!Normalize Left

1 2 Yellow Solid 3 Fasttest.Ch.2 Ampl!Normalize Left

-6

+1

-5

-4

-3

-2

-1

+0

d

B

r

A

30 10k50 100 200 500 1k 2k 5k

Hz

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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8.2 PASSBAND RIPPLE (10K OHM LOADING)

8.2.1 PASSBAND RIPPLE @ 44.1 ks/sec

C-MEDIA 05/31/05 14:11:07Digital Playback (P C-D-A) for Line Output Passband

Ripple @44.1ks/sec

WL-PassbandRipple-M44k.at2c

ColorSweep Trace Line Style Thick Data Axis Comment

1 1 Cyan Solid 3 Fasttest.Ch.1 Ampl!Normalize Left

1 2 Yellow Solid 3 Fasttest.Ch.2 Ampl!N ormalize Left

-0.4

+0.4

-0.2

-0

+0.2

d

B

40 8k50 100 200 500 1k 2k 5k

Hz

8.2.2 PASSBAND RIPPLE @ 48 ks/sec

C-MEDIA 05/31/05 14:09:08Dig ital Playback (PC-D-A) for Line Output Pas sband

Ripple @4 8ks/sec

WL-PassbandRipple-M48k.at2c

ColorSweep Trace Line S tyle Thick Data Axis Comment

1 1 Cyan Solid 3 Fasttest.Ch.1 Ampl!Normalize Left

1 2 Yellow Solid 3 Fasttest.Ch.2 Ampl!Normalize Left

-0.4

+0.4

-0.2

-0

+0.2

d

B

40 9k50 100 200 500 1k 2k 5k

Hz

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

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9. REFERENCE APPLICATION CIRCUIT

CM101S+

USB Audio With Dolby Digital Live Solution

Date: 09/25/2005 Version: 1.01

- 22 -

10. REFERENCE

♦ Universal Serial Bus Specification, Version 2.0

♦ Universal Serial Bus Device Class Definition for Audio Devices, Version 1.0.

♦ Universal Serial Bus Device Class Definition for Human Interface Devices (HID), Version

1.11

♦ Dolby Digital Live function specification.

－End of Specifications－

C-MEDIA ELECTRONICS INC.

6F., 100, Sec. 4, Civil Boulevard, Taipei, Taiwan 106 R.O.C.

TEL:886-2-8773-1100

FAX:886-2-8773-2211

E-mail：sales@cmedia.com.tw URL：http://www.cmedia.com.tw