CMEDIA NITROGEND2 16-bit stereo usb audio controller Datasheet

The Best USB Audio Single Chip for Stereo Digital
Adaptor Application
Nitrogen D2
16-Bit Stereo USB Audio Controller
(Dolby Digital Live and DTS Interactive Software Technology Bundle)
Datasheet
Version 1.02
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 [email protected]
Nitrogen D2
USB Audio With Dolby Digital Live and DTS Interactive Solution
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.
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 C-MEDIA ELECTRONICS, INC.
COPYRIGHT
U
Copyright (c) 2005-2007 C-Media Electronics Inc.
All rights reserved. All content included on this document, such as text, graphics, logos,
button 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.
TRADEMARKS
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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*
Date: 09/25/2005
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USB Audio With Dolby Digital Live and DTS Interactive Solution
TABLE OF CONTENTS
1. DESCRIPTIONS AND OVERVIEW
5
2. FEATURES
6
3. PIN DESCRIPTIONS
8
3.1 PIN ASSIGNMENT BY PIN NUMBER
8
3.2 PIN-OUT DIAGRAM
8
3.3 PIN SIGNAL DESCRIPTIONS
9
4. BLOCK DIAGRAM
12
5. ORDERING INFORMATION
13
6. FUNCTION DESCRIPTIONS
14
6.1 USB INTERFACE
14
6.1.1
DEVICE DESCRIPTOR
14
6.1.2
CONFIGURATION DESCRIPTOR
15
6.1.3
USB AUDIO TOPOLOGY DIAGRAM
15
6.2 EEPROM (93C46) CONTENT FORMAT
16
6.3 HID FEATURE
17
6.3.1
WHAT’S HID
17
6.3.2
HID DESCRIPTOR
17
6.4 DYNAMIC RANGE CONTROL (DRC)
19
6.5 DOLBY DIGITAL LIVE TECHNOLOGY
20
6.5.1
DOLBY DIGITAL LIVE TECHNOLOGY
20
6.5.2
DIGITAL THEATER SYSTEM (DTS INTERACTIVE)
20
6.6 BENEFITS AND ADVANTAGE
21
7. ELECTRICAL CHARACTERISTICS
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7.1 ABSOLUTE MAXIMUM RATING
23
7.2 OPERATION CONDITIONS
23
7.3 SPERKER IMPEDANCE VS. OUTPUT POWER (PER CHANNEL)
23
7.4 AUDIO PERFORMANCE
24
8. AUDIO PERFORMANCE CURVES
8.1 FREQUENCY RESPONSE (10K OHM LOADING)
25
25
8.1.1
FREQUENCY RESPONSE @ 44.1 KS/SEC
25
8.1.2
FREQUENCY RESPONSE @ 48 KS/SEC
25
8.2 PASSBAND RIPPLE (10K OHM LOADING)
26
8.2.1
PASSBAND RIPPLE @ 44.1 KS/SEC
26
8.2.2
PASSBAND RIPPLE @ 48 KS/SEC
26
9. REFERENCE APPLICATION CIRCUIT
27
10. REFERENCE
28
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USB Audio With Dolby Digital Live and DTS Interactive Solution
1. DESCRIPTIONS AND OVERVIEW
Nitrogen D2 is the world first USB audio chip that with Dolby Digital Live and dts Interactive
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 Nitrogen D2 a
simple and very cost-effective solution.
Nitrogen D2 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 and dts 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 and
dts (Digital Theater System) are the world well-known sound technology brands 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 Digital and dts 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. and DTS Corporate. through
C-Media.
Moreover, the innovation technology DRC feature was integrated on Nitrogen D2. This
Dynamic Range Control function can support high efficiency volume output to get loudness
sound effect similar D class amplifier capability. Vender can just using single chip to saving
external amplifier component and getting a better listen experience when listen to a music
source with wide dynamic range.
Date: 09/25/2005
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USB Audio With Dolby Digital Live and DTS Interactive Solution
For vender specific requests, customers can use an EEPROM to create vendor specific
VID / PID / Product String, and even special hardware configuration. More flexible and
customized design is possible with GPIO pin, which is accessible by USB vendor specific
request. Volume control VR input pin; a traditional speaker front panel design can be built.
Nitrogen D2 support USB standard HID Interface which provide Volume _up / Volume
_down / Playback mute Buttons and Rotary Encoder for pure digital volume control.
2. FEATURES
USB 2.0 Full Speed Compatible and USB IF certification
USB Audio Devices Class Specification Ver1.0 Compatible
USB Bus Powered 500mA, without External Power Supply
High performance 16-Bit Stereo, 48 / 44.1 KHz Sampling Rate for Audio Playback
S/PDIF Output Interface
Embedded USB Transceiver
Embedded High Performance 16-Bit Audio DAC
Embedded Digital Control Power Amplifier for Speaker Driving
Support Power Amplifier Enable / Disable Control Pin
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USB Audio With Dolby Digital Live and DTS Interactive Solution
Support Dynamic Range Control (DRC) Feature to Provide a Better Listen Experience
Embedded Power-On-Reset Block
Embedded 5V to 3.3V Regulator with Voltage Level Detector for Single 5V External
Power Supply
Embedded Temperature Protection Circuit
Embedded X2 Modulation for Higher Audio Quality
Embedded Anti-Pop Circuit with Internal Feedback Structure
Single 12MHz Crystal Input with Embedded PLL
Isochronous Transfer using Adaptive Synchronization with Internal PLL
External EEPROM Interface for Vendor Specific VID / PID / Product String
EEPROM Read / Write Function via Vendor Specific Request for Mass Production
Convenience
Analog Volume Control Input with Simple External VR Circuit
Digital Volume Control Input with Digital Rotary Encoder or Vol_up / Vol_dn /
Play_mute Bottoms
Vol_up / Vol_dn / Play_mute Pins and Digital Rotary Encoder Interface
Support USB HID Devices Class Ver1.11 for Host Volume Control
Synchronization
3.3V I/O with 5V Tolerance
Dolby® Digital Audio Streaming via S/PDIF Output
Supports USB Suspend / Resume Mode and Remote Wakeup with Digital Volume
Control Pins
LED Indicator Pin During Playback
1 GPIO pin for Application Specific Usage
Dolby Digital Live Software Sound Technology Bundle
Digital Theater System (DTS Interactive) Software Sound Technology Bundle
USB Software Driver Compatible with Win 98SE / Win ME / Win 2000 / Win
XP
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USB Audio With Dolby Digital Live and DTS Interactive Solution
3. PIN DESCRIPTIONS
3.1 PIN ASSIGNMENT BY PIN NUMBER
Pin # Signal Name Pin # Signal Name Pin # Signal Name Pin # Signal Name
1
EESK
13
NC
25
AVDD
37
NC
2
DVDD5V
14
NC
26
AVDD
38
DRCEN
3
EECS
15
REGV
27
LOL
39
SPDIFO
4
EEDW
16
NC
28
LOL
40
PDSW
5
EEDR
17
USB_DP
29
LOL
41
PAEN
6
LEDO
18
NC
30
LOL
42
GPIO
7
MUTE
19
USB_DM
31
LOR
43
VOL_UP
8
DVDD5V
20
NC
32
LOR
44
VOL_DN
9
DVDD5V
21
DVSS
33
LOR
45
DVSS
10
VP
22
TEST
34
LOR
46
NC
11
VN
23
VREF
35
AVSS
47
XTAL_O
12
NC
24
VOLADJ
36
AVSS
48
XTAL_I
*Note: -NC- means No-Connect
DRC EN
NC
PDSW
SPDIFO
GPIO
PAEN
VOL_UP
DVSS
VOL_DN
NC
XTAL_I
XTAL_O
3.2 PIN-OUT DIAGRAM
48
EESK
37
1
36
AVSS
DVDD5V
AVSS
EECS
LOR
EEDW
LOR
EEDR
LOR
LEDO
LOR
MUTE
LOL
DVDD5V
LOL
DVDD5V
VP
LOL
Nitrogen D2
VN
12
25
Date: 09/25/2005
VREF
TEST
DVSS
NC
USB_DM
NC
NC
USB_DP
REGV
24
NC
NC
13
AVDD
VOL_ADJ
NC
LOL
AVDD
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USB Audio With Dolby Digital Live and DTS Interactive Solution
3.3 PIN SIGNAL DESCRIPTIONS
Pin #
Symbol
Type
1
EESK
DO, 8mA, SR
2
DVDD5V
P
3
EECS
DO, 8mA, SR
EEPROM Interface Chip Select
4
EEDW
DO, 8mA, SR
EEPROM Interface Write to EEPROM
5
EEDR
DI, ST, PD,
5VT
6
LEDO
DO, 8mA, SR
7
MUTE
DI, ST, PU
8
DVDD5V
P
5V Power Supply
9
DVDD5V
P
5V Power Supply
10
VP
DI, ST, PU
Digital Rotary Encoder Interface Pin A
11
VN
DI, ST, PU
Digital Rotary Encoder Interface Pin B
12
NC
-
No Connect
13
NC
-
No Connect
14
NC
-
No Connect
15
REGV
AO
16
NC
-
17
USB_DP
AIO
18
NC
-
No Connect
19
USB_DM
AIO
USB Data D-
20
NC
-
No Connect
21
DVSS
P
Digital Ground
22
TEST
DI, ST, PD
Test Mode Select Pin, Pull-Down in normal Operation
23
VREF
AO
Connecting to External Decoupling Capacitor for
Embedded Band-gap Circuit; 2.25V Output
Description
EEPROM Interface Clock
5V Power Supply for Digital Circuit
EEPROM Interface Read from EEPROM
LED Indicator for Playback
Mute Pin (HID Standard)
Regulator output 3.3V
No Connect
USB Data D+
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USB Audio With Dolby Digital Live and DTS Interactive Solution
Analog Volume Control Input from external VR circuit.
24
VOLADJ
AI
0 ~ 2.25V:+3dB / mute
3.5 ~ 5V: 0dB
25
AVDD
P
5V Power Supply for Analog Circuit
26
AVDD
P
5V Power Supply for Analog Circuit
27
LOL
AO
Line Out Left Channel
28
LOL
AO
Line Out Left Channel
29
LOL
AO
Line Out Left Channel
30
LOL
AO
Line Out Left Channel
31
LOR
AO
Line Out Right Channel
32
LOR
AO
Line Out Right Channel
33
LOR
AO
Line Out Right Channel
34
LOR
AO
Line Out Right Channel
35
AVSS
P
Analog Ground
36
AVSS
P
Analog Ground
37
NC
-
No Connect
38
DRCEN
DI
1:DRC ON (default)
39
SPDIFO
DO, 8mA, SR
S/PDIF Data Output
0:DRC Off
Power Down Switch Control Signal Output
40
PDSW
DO, 8mA, SR
1: Normal Mode
0: Power Down Mode (Suspend Mode)
Power Amplifier Control Input, Connect to a Switch or
Pull-High in Normal Operation.
41
PAEN
DI, ST
H: Enable Power Amplifier (Normal Mode)
L: Disable Power Amplifier
Date: 09/25/2005
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USB Audio With Dolby Digital Live and DTS Interactive Solution
DIO, 8mA, ST,
GPIO Pin, Controlled via Vender Specific Command
SR, PD
42
GPIO
43
VOL_UP
DI, ST, PU
Volume Up Pin (HID Standard)
44
VOL_DN
DI, ST, PU
Volume Down Pin (HID Standard)
45
DVSS
P
Digital Ground
46
NC
-
No Connect
47
XTAL_O
AO
Output Pin for 12MHz Oscillator
48
XTAL_I
AI
Input Pin for 12MHz Oscillator
*Note :DI / DO / DIO – Digital Input / Output / Bi-Directional Pad
U
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)
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USB Audio With Dolby Digital Live and DTS Interactive Solution
4. BLOCK DIAGRAM
VOLADJ
SPDIFO
VN
VP
MUTE
VOL_DN
VOL_UP
PAEN
PDSW
D+
HID Control I/F
ADC
D-
TEST
USB I/F
Dynamic
Range
Control
FIFO
LEDO
GPIO
EEDR
EEDW
EESK
EEPROM
I/F
EECS
USB
Clock Gen
2x Over
Sampling
Digital Filter
VOL
DAC
- 43.5~ +3dB
DAC
- 43.5 ~ +3dB
Audio
Clock Gen
VOL
Bandgap
Crystal OSC
OP
LOL
OP
LOR
VREF
Power Supply
GND
REGV
(3.3V)
5V
XTAL_I
XTAL_O
Block Diagram Of Nitrogen D2
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USB Audio With Dolby Digital Live and DTS Interactive Solution
5. ORDERING INFORMATION
Model
Number
Package
Operating Ambient
Temperature
Supply Range
Nitrogen D2
48-Pin LQFP
7mm×7mm×1.4mm (Plastic)
0oC to +70oC
DVdd = 5V,
AVdd = 5V
48-Lead Thin Plastic Quad Flatpack (LQFP)
Outline Dimensions *Dimensions shown in inches and (mm)
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6. FUNCTION DESCRIPTIONS
6.1 USB INTERFACE
6.1.1 DEVICE DESCRIPTOR
Offset
Field
Size
Value
(Hex)
0
bLength
1
12
Total 18 Bytes
1
bDescriptorType
1
01
Device Descriptor
2
bcdUSB
2
0110
4
bDeviceClass
1
00
5
bDeviceSubClass
1
00
6
bDeviceProtocol
1
00
7
bMaxPacketSize0
1
08
8
idVendor
2
0D8C
Vendor ID
10
idProduct
2
0104
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
Date: 09/25/2005
Description
USB 1.1 compliant.
Endpoint Zero Size = 8 bytes
"
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6.1.2 CONFIGURATION DESCRIPTOR
Offset
Field
Size
Value
(Hex)
0
bLength
1
09
Total 9 Bytes
1
bDescriptorType
1
02
Configuration Descriptor
2
wTotalLength
2
008D
4
bNumInterfaces
1
03
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
Description
Total length of data returned for this
configuration.
Number of interfaces supported by this
Configuration.
6.1.3 USB AUDIO TOPOLOGY DIAGRAM
USB streaming
ID = 01
Feature Unit
(Volume) (Mute)
ID = 0D
Date: 09/25/2005
Speaker
ID = 03
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6.2 EEPROM (93C46) CONTENT FORMAT
Nitrogen D2 supports four-wire serial EEPROM interface. When an external serial
EEPROM is detected, Vendor ID, Product ID, and Product String reported within
Device Descriptor will be derived from the content of serial EEPROM. The setting
values of serial EEPROM is shown below:
Address
Contents
00
0x434D (*Note1)
01
Vender ID
02
Product ID
03
String1, String0
04
String3, String2
05
String5, String4
06
String7, String6
07
String9, String8
08
String11, String10
09
String13, String12
10
String15, String14
11
String17, String16
12
String19, String18
13
String21, String20
14
String23, String22
15
Bit 0: DRC Enable / Disable
16~63
--
*Note: The first word of the EEPROM is a magic code. Only when it matches,
the IC will regard the serial EEPROM valid.
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USB Audio With Dolby Digital Live and DTS Interactive Solution
6.3 HID FEATURE
Nitrogen D2 provides HID feature with user setting to Volume-Up, Volume-Down,
Playback-Mute button pin, and the Digital-Rotary-Encoder for Volume Control is
reported to the host to synchronize host side setting.
6.3.1 WHAT’S HID
USB protocols can configure devices at startup or when they are plugged in at run
time. These devices are broken into various device classes. Each device class
defines the common behavior and protocols for devices that serve similar
functions. The HID (Human Interface Device) class is one of the device classes.
The HID class consists primarily of devices that are used by humans to control the
operation of computer systems. Typical examples of HID class devices include:
-
Keyboards and pointing devices, for example: mouse, trackballs, and
joysticks.
-
Front-panel controls, for example: knobs, switches, buttons, and sliders.
Controls that might be found on devices such as VCR remote controls,
games or simulation devices, for example: data gloves, throttles, and
steering wheels.
-
Devices that may not require human interaction but provide data in a
similar format to HID class devices, for example: bar-code readers,
thermometers, or voltmeters.
6.3.2 HID DESCRIPTOR
HID Interface Descriptor
Offset
Field
Size
Value (Hex)
0
bLength
1
09
Size of this descriptor: 9 byte
1
bDescriptorType
1
04
INTERFACE descriptor type
2
bInterfaceNumber
1
02
Number of Interface
3
bAlternateSetting
1
00
alternate 0
Date: 09/25/2005
Description
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USB Audio With Dolby Digital Live and DTS Interactive Solution
Offset
Field
Size
Value (Hex)
Description
4
bNumEndpoints
1
01
Number of endpoints used by this
Interface: 1
5
bInterfaceClass
1
03
HID Interface Class
6
bInterfaceSubClass
1
00
No Subclass
7
bInterfaceProtocol
1
00
Must be set to 0
8
iInterface
1
00
Index of a string descriptor that
describes this interface.
HID Descriptor
Offset
Field
Size
Value (Hex)
Description
0
bLength
1
09
Total 9 Bytes
1
bDescriptorType
1
21
HID Descriptor Type
2
bcdHID
2
0100
4
bCountryCode
1
00
5
bNumDescriptors
1
01
6
bDescriptorType
1
22
7
wDescriptorLength
2
002A
Numeric expression that is the
total size of the optional descriptor
Description
HID class version 1.00
Report Descriptor
Interrupt IN Endpoint Descriptor
Offset
Field
Size
Value (Hex)
0
bLength
1
07
Total 7 Bytes
1
bDescriptorType
1
05
ENDPOINT Descriptor Type
2
bEndpointAddress
1
81
3
bmAttributes
1
03
4
wMaxPacketSize
2
0003
6
bInterval
1
04
Date: 09/25/2005
IN Endpoint
Endpoint number = 3
Interrupt endpoint type
Maximum packet size: 4 bytes
Interrupt Interval: 4ms
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6.4 DYNAMIC RANGE CONTROL (DRC)
Nitrogen D2 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.
+20dB
+10dB
Peaks Reduced
0dB
-10dB
-20dB
-30dB
-40dB
-50dB
B
A
Lower Levels Raised
-60dB
With Dynamic Range Control enabled, the full dynamic range (A) of the program
is reduced (B).
Peaks Clipped
Peaks Reduced
DRC
Lower Levels
hard to heard
A
B
Lower Levels Raised
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USB Audio With Dolby Digital Live and DTS Interactive Solution
6.5 DOLBY DIGITAL AND DTS SOUND TECHNOLOGY
6.5.1 DOLBY DIGITAL LIVE TECHNOLOGY
C-Media Xear 3D™ Sound Solution provides another state-of-the-art high quality audio
function--Dolby digital AC-3 encoder module. With this real-time software 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.
A technology that can encode all the digital audio content on
PC into Dolby Digital stream in real-time. It can then be sent to
external decoder for playback. All path are digital and wiring is
simple.
6.5.2 DIGITAL THEATER SYSTEM (DTS interactive)
Besides Dolby, C-Media was also the world first PC audio provider whom can integrate
whole DTS Digital DSP technology in software module. Everyone knows that, DTS is the
famous of the world sound technology which guarantee high quality and performance.
DTS Interactive can take any content (WMA, MP3, CD, and more!) to transfer 5.1
multi-chances with real-time whenever play on line game, listen music, and watch VCD.
A real-time DTS encoder which takes any LPMC (2 channel or
more) and encodes it into DTS bit stream. The data transfer
format is 48 KHz at 1.5 mb/sec. Just using a single cable
connection to your DTS enabled surround sound system such
as, powered PC speakers, an A/V receiver or any other DTS
compatible surround sound system.
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 or DTS 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.
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USB Audio With Dolby Digital Live and DTS Interactive Solution
6.6 BENEFITS AND ADVANTAGES
Uses a single digital connection
Transforms all PC audio signals into a Dolby and DTS Digital signal
Optimized for low-latency interactive applications
Provides realistic 5.1-channel surround sound effects during interactive video
game play
Advantages of this feature：
1.Getting higher quality audio signal output compared with any other SPDIF-Out solutions.
C-Media Xear 3D™ Plus DDL or DTS INTERACTIVE encoder sound solution can
directly process and transmit any PC sound source to digital AC-3 or DTS 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 or DTS INTERACTIVE
bit-stream, they have to rely on software DVD player, from which only DVD playback is
achievable. In that case, it will limit and impair the high quality multi-channel sound
Date: 09/25/2005
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USB Audio With Dolby Digital Live and DTS Interactive Solution
enjoyment. C-Media DDL or DTS INTERACTIVE encoder solution not only retains the
above functions, but also provides other possible applications on PC audio. Xear 3D™
plus AC-3 or DTS encoder 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 Dolby Digital Live or DTS
INTERACTIVE 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 or
DTS INTERACTIVE bit-stream and getting high quality digital signal to external decoder
and speakers for enjoyment.
Date: 09/25/2005
Version: 1.02
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USB Audio With Dolby Digital Live and DTS Interactive Solution
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
Avinout
Voltage on any Analog Input or Output Pin
–0.3 to +5.5
T stg
B
B
Storage Temperature Range
V
0
-40 to +125
P
C
P
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
o
P
C
P
7.3 SPERKER IMPEDANCE VS. OUTPUT POWER (PER CHANNEL)
Loading (Ohm)
4 Ohm
8 Ohm
32 Ohm
10K Ohm
3.14
3.4
3.635
3.722
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
Items
Vpp
Vrms
*Note1: Test Condition @ 25oC, 5 Volt +- 10%, 1KHz Sin Wave
Date: 09/25/2005
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USB Audio With Dolby Digital Live and DTS Interactive Solution
*Note2: Typical Output with THD+N < 1%; Maximal 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
SNR
--
97.75
--
dB
Dynamic Range
--
96.27
--
dB
THD + N
--
-67.97
--
dB
Output Voltage (rms)
-
1.316
-
Vrms
SNR
--
97.68
--
dB
Dynamic Range
--
95.99
--
dB
THD + N
--
-57.82
--
dB
Output Voltage (rms)
-
1.285
-
Vrms
SNR
--
97.67
--
dB
Dynamic Range
--
96.03
--
dB
THD + N
--
-53.28
--
dB
Output Voltage (rms)
-
1.202
-
Vrms
SNR
--
97.45
--
dB
Dynamic Range
--
95.89
--
dB
THD + N
--
-52.76
--
dB
Output Voltage (rms)
-
1.11
-
Vrms
DAC (10K Ohm Loading)
DAC (32 Ohm Loading)
DAC (8 Ohm Loading)
DAC (4 Ohm Loading)
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USB Audio With Dolby Digital Live and DTS Interactive Solution
8. AUDIO PERFORMANCE CURVES
8.1 FREQUENCY RESPONSE (10K OHM LOADING)
8.1.1 FREQUENCY RESPONSE @ 44.1 KS/SEC
C-MEDIA
Digital Playback (PC-D-A) for Line O utput Frequency
Response
05/31/05 14:10:33
+1
+0
d
B
r
-1
-2
-3
A
-4
-5
-6
20
50
100
200
500
1k
2k
5k
10k
Hz
Sw eep
Trace
C olor
Line Style
Thick
D ata
Axis
1
1
1
2
C yan
Yellow
Solid
Solid
3
3
Fas ttes t.C h.1 Am pl!N orm alize
Fas ttes t.C h.2 Am pl!N orm alize
Left
Left
C om m ent
WL-Multitone-44k.at2c
8.1.2 FREQUENCY RESPONSE @ 48 KS/SEC
C-MED IA
Digital Playback (PC-D-A) for Line Output Frequency
Response
05/31/05 14:07:22
+1
+0
d
B
r
-1
-2
-3
A
-4
-5
-6
30
50
100
200
500
1k
2k
5k
10k
Hz
Sw eep
Trace
C olor
Line Style
Thick
D ata
Axis
1
1
1
2
C yan
Yellow
Solid
Solid
3
3
Fas ttes t.C h.1 Am pl!N orm alize
Fas ttes t.C h.2 Am pl!N orm alize
Left
Left
C om m ent
WL-Multitone-48k.at2c
Date: 09/25/2005
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USB Audio With Dolby Digital Live and DTS Interactive Solution
8.2 PASSBAND RIPPLE (10K OHM LOADING)
8.2.1 PASSBAND RIPPLE @ 44.1 KS/SEC
C-MEDIA
Digital Playback (PC-D-A) for Line Output Passband
Ripple @44.1ks/sec
05/31/05 14:11:07
+0.4
+0.2
d
B
-0
-0.2
-0.4
40
50
100
200
500
1k
2k
5k
8k
Hz
Sweep
Trace
Color
Line Style
Thick
Data
Axis
1
1
1
2
Cyan
Yellow
Solid
Solid
3
3
Fas ttes t.Ch.1 Am pl!Norm alize
Fas ttes t.Ch.2 Am pl!Norm alize
Left
Left
Com m ent
WL-Pas s bandRipple-M44k.at2c
8.2.2 PASSBAND RIPPLE @ 48 KS/SEC
C-MEDIA
Digital Playback (PC-D-A) for Line Output Passband
Ripple @48ks/sec
05/31/05 14:09:08
+0.4
+0.2
d
B
-0
-0.2
-0.4
40 50
100
200
500
1k
2k
5k
9k
Hz
Sweep
Trace
Color
Line Style
Thick
Data
Axis
1
1
1
2
Cyan
Yellow
Solid
Solid
3
3
Fasttes t.Ch.1 Am pl!Norm alize
Fasttes t.Ch.2 Am pl!Norm alize
Left
Left
Com m ent
WL-Pass bandRipple-M48k.at2c
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9. REFERENCE APPLICATION CIRCUIT
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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 and dts Interactive 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： [email protected]
TU
UT
URL： http://www.cmedia.com.tw
TU
Date: 09/25/2005
UT
Version: 1.02
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