CRD4201-2
CrystalClear™ AC '97 Six Channel Primary ACR Audio Reference Design
Features
l Six Channel Analog Audio Output
l Built-in Headphone Amplifier
l CS4201 audio codec and CS4334 DACs
l 20-bit D to A conversion (DAC)
l 18-bit A to D conversion (ADC)
l S/PDIF (IEC-958) optical digital output
l Complete suite of Analog I/O connections:
– Line, Mic, CD, Video and Aux Inputs
– Line Front, and Line Rear Outputs
l 2-layer low cost PC board
l Meets Intel
l Exceeds Microsoft’s
audio performance requirements.
®
AC ‘97 version 2.1 specification
®
PC 99 and PC-2001
Description
The CRD4201-2 Advanced Communications Riser
(ACR) reference design features six channel analog audio outputs and a optical S/PDIF digital output. This
board uses the CS4201 audio codec which has several
advanced features such as a built-in headphone amplifier, up to 30 dB of microphone boost, and serial digital
audio outputs.
The CRD4201-2 reference design is available by ordering the CMK4201-2 manufacturing kit. This kit includes
a full set of schematic design files (OrCAD
®
CAD
9.1 formats), PCB job files (PADS® ASCII), PCB
artwork files, and bill of materials. This reference design
offers significant cost savings over competing solutions
and can be easily modified to meet your specific design
goals.
ORDERING INFO
CMK4201-2 (Manufacturing Kit)
®
7.2 and Or-
Microphone Input
Front Channel Outputs
Front Channel Outputs
Headphone Output
Rear Channel Outputs
Center Channel and
Sub-Woofer Outputs
S/PDIF Digital
Optical Output
Preliminary Product Information
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.cirrus.com
MIC
IN
AUX INVIDEO INCD ININT MODEM
LINE
IN
LINE
OUT
HEADPH
OUT
SURR
OUT
CNT/LFE
OUT
S/PDIF
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
Copyright Cirrus Logic, Inc. 2001
Cirrus Logic
CRD4201-2
CS4201
OUT
(All Rights Reserved)
DS483RD2A2
JUN ‘01
1
TABLE OF CONTENTS
1. GENERAL INFORMATION ...................................................................................3
2. SCHEMATIC DESCRIPTION ................................................................................3
2.1 CS4201 Audio Codec .................................................................................3
2.2 Analog Inputs ..............................................................................................3
2.3 Rear, Center and Sub-Woofer Outputs ......................................................4
2.4 Front Channel and Headphone Outputs ....................................................4
2.5 S/PDIF Optical Output ...............................................................................4
2.6 ACR Connector and EEPROM ...................................................................4
2.7 Component Selection .................................................................................4
2.8 EMI Components ........................................................................................5
3. GROUNDING AND LAYOUT ................................................................................5
3.1 Partitioned Voltage and Ground Planes .....................................................5
3.2 CS4201 Layout Notes .................................................................................5
4. REFERENCES .......................................................................................................6
4.1 ADDENDUM ...............................................................................................6
5. BILL OF MATERIALS .........................................................................................19
LIST OF FIGURES
CRD4201-2
Figure 1. Block Diagram ....................................................................................................7
Figure 2. CS4201 Audio Codec .........................................................................................8
Figure 3. Analog Inputs ......................................................................................................9
Figure 4. Rear, Center, and Sub-Woofer Outputs ...........................................................10
Figure 5. Front Channel and Headphone Outputs ..........................................................11
Figure 6. S/PDIF Optical Output ......................................................................................12
Figure 7. ACR Connector .................................................................................................13
Figure 8. PCB Layout: Top Assembly Drawing ................................................................14
Figure 9. PCB Layout: Top Layer ....................................................................................15
Figure 10. PCB Layout: Bottom Layer .............................................................................16
Figure 11. PCB Layout: Drill Drawing ..............................................................................17
Figure 12. PCB Layout: Top Silkscreen ..........................................................................18
Contacting Cirrus Logic Support
For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:
http://www.cirrus.com/corporate/contacts/
Microsoft , Windows 95, Windows 98 and Windows Millennium and WHQL is registered trademark of Microsoft.
CrystalClear is a trademark of Cirrus Logic, Inc.
Intel is a registered trademark of Intel Corporation.
OrCAD is a registered trademark of OrCAD, Inc.
PADS is a registered trademark of, PADS Software, Inc.
Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance product information
describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts to ensure that the information contained
in this document is accurate and reliable. However, the information is subject to change without notice and is provided “AS IS” without warranty of any kind (express
or implied). No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, nor for infringements of patents or other rights of third parties. This
document is the property of Cirrus Logic, Inc. and implies no license under patents, copyrights, trademarks, or trade secrets. No part of this publication may be
copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or otherwise) without the prior
written consent of Cirrus Logic, Inc. Items from any Cirrus Logic website or disk may be printed for use by the user. However, no part of the printout or electronic
files may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or otherwise) without the prior written consent of Cirrus Logic, Inc.Furthermore, no part of this publication may be used as a basis for manufacture or sale of any items without the
prior written consent of Cirrus Logic, Inc. The names of products of Cirrus Logic, Inc. or other vendors and suppliers appearing in this document may be trademarks
or service marks of their respective owners which may be registered in some jurisdictions. A list of Cirrus Logic, Inc. trademarks and service marks can be found
at http://www.cirrus.com.
2 DS483RD2A2
CRD4201-2
1. GENERAL INFORMATION
The CRD4201-2 reference design is an ACR card
that features six channel CD quality analog audio
outputs. The card includes a CS4201 AC ’97 audio
codec and two CS4334 24-bit serial stereo DACs.
This combination gives the CRD4201-2 a rich feature set and industry leading audio performance.
The CS4201 on this card is configured as the primary AC ‘97 audio codec. If there is an AC ‘97 audio codec on the motherboard, it must be disabled.
The CS4201 audio codec has a stereo 20-bit DAC,
a stereo 18-bit ADC, and a very flexible analog audio mixer. The serial data outputs are paired with
two CS4334 DACs to provide four additional channels of analog audio. The CS4201 also features
three stereo pairs of line level analog inputs, a microphone input, and a stereo pseudo-differential
CD input. The input signals can be routed to the
ADC for recording or mixed together for recording
and direct playback. The CS4201 has internal registers that are used to control its various features
such as volume levels, audio muting, and signal
routing. The CS4201 maintains high audio quality
®
and exceeds the Microsoft
audio performance specification.
The CS4201 audio codec communicates to the audio controller across the ACR interface through the
AC-Link. The AC-Link is a 5-wire serial digital interface that transfers digital audio between the two
devices and also sends commands from the audio
controller to the CS4201’s registers. For more information on the AC-Link, see the Intel® AC’97
version 2.1 specification.
PC-99 and PC-2001
2. SCHEMATIC DESCRIPTION
The block diagram in Figure 1 illustrates the interconnections between the schematic pages found at
the end of this document. Sections 2.1 through 2.8
describe the circuitry contained in these schematics.
2.1 CS4201 Audio Codec
The CS4201 audio codec is shown in Figure 2. The
input signals to the CS4201 originate from the analog inputs in Figure 3, and the analog outputs are
shown in Figure 5. AFLT1 and AFLT2 (pins 29,
30) require 1000 pF NPO/COG capacitors connected to analog ground. These capacitors provide
a single pole lowpass filter at the inputs of the
ADC. No other input filtering is required.
FLT3D, FLTI, and FLTO (pins 32, 33, 34) form the
internal analog 3D enhancement filter. The FLT3D
pin requires a 0.01 µF capacitor to analog ground.
The FLT0 and FLT1 pins require a NPO/COG
1000 pF series capacitor.
The AC-Link may require series termination resistors to prevent reflections. These are normally
placed as close as possible to the transmitting end
of a particular AC-Link signal. Both SDATA_IN
(pin 8) and BIT_CLK (pin 6) are outputs of the
CS4201 and each have a 47 Ω series termination
resistor.
The CS4201 is powered by separate analog and
digital power supplies, each with their own respective grounds. The AGND symbols refer to analog
ground, and DGND symbols refer to digital
ground. The analog and digital grounds must be
connected together. For best results, connect them
together at a single point with a 0.050 inch trace underneath the CS4205. Each power pin needs separate decoupling capacitors. The CS4201 audio
codec uses a 0.1 uF ceramic capacitor for each of
the 3.3 V digital and 5 V analog supply pins. These
decoupling capacitors are placed as close as possible to their respective pins.
2.2 Analog Inputs
The LINE_IN, VIDEO, and AUX_IN stereo input
jacks in Figure 3 are connected to a 6 dB voltage
divider and AC coupled to the CS4201. The voltage divider allows input signal levels of up to
DS483RD2A2 3
CRD4201-2
2 Vrms. The 2.2 µF AC coupling capacitor values
are used to minimize low frequency roll-off.
The microphone circuit is AC coupled by a 1 µF capacitor to minimize low frequency roll-off. The
microphone circuit provides low voltage phantom
power for electret microphones. Phantom power is
derived from the +5 V analog supply and provides
a maximum of 4.2 V under no load and a minimum
of 2.0 V under a 0.8 mA load. These parameters are
required by PC-99 and PC-2001.
The CS4201 features a pseudo-differential CD input that minimizes common mode noise and interference. Each CD signals acts as one side of the
differential input and CD_COM acts as the other
side. CD_COM is used as the common return path
for both the left and right channels.
2.3 Rear, Center, and Sub-Woofer Outputs
The outputs in Figure 4 drive the rear speakers
(surround), center speaker (CNT), and sub-woofer
(LFE) in a six channel audio application. These
four outputs are driven digitally from the CS4201
through two serial output ports and converted to analog audio through two high-performance CS4334
24-bit stereo DACs.
2.4 Front Channel and Headphone Outputs
Figure 5 details the Headphone Output and Line
Output circuits. The Line Outputs are the main analog outputs in a two channel system or the Front
Outputs in a six channel audio system.
The Line Outputs of the CS4201 (pins 35 and 36)
are buffered by a Motorola MC34072 dual opamp. The MC34072 is a high performance low
noise op-amp well suited for audio applications.
Line Out is designed to drive high impedance loads
of 10 KΩ or higher.
The CS4201 has a built in headphone amplifier on
pins 39 and 41. These outputs are capable of driv-
ing headphones with impedances as low as 32 Ω.
The headphone outputs are AC coupled through
220 µF capacitors. These large capacitor values
create excellent low frequency response even under
32 Ω loads.
2.5 S/PDIF Optical Output
The S/PDIF (IEC-958) digital output shown in
Figure 6, is compatible with digital outputs on consumer devices such as Mini Disk recorders and
consumer stereo receivers. The S/PDIF output operates at a fixed sampling frequency of 48 kHz. It
uses an industry standard TOSLINK digital optical
transmitter, the Toshiba TOTX-173.
2.6 ACR Connector and EEPROM
The ACR connector is shown in Figure 7. ACR is a
motherboard interface that supports audio, modem,
LAN, and DSL subsystems. ACR applications are
targeted at OEMs, system manufacturers, and system integrators who wish take advantage of physically separating their audio, modem, or LAN
circuitry from the PC motherboard. ACR accomplishes this without the additional cost associated
with the interface circuitry required for a PCI bus
add-in card.
The CRD4201-2 uses a 24LC09 EEPROM to store
configuration data for plug-and-play enumeration.
The 24LC09 is designed specifically for ACR applications. The base address of the device is internally wired to 0xB0. The EEPROM holds the
Subsystem Vendor ID and Subsystem ID. For ACR
design specifications, programming utilities, and
information on programming the EEPROM see the
Advanced Communication Riser Special Interest
Group (ACR SIG) homepage at http://www.acrsig.org/.
Note: an ACR signal called PRIMARY_DN# is
normally tied to ID0# on the CS4201. This signal is
used to set the AC ’97 codec on the ACR card as either the primary or secondary audio codec. The
CRD4201-2 is designed to have the only audio co-
4 DS483RD2A2
CRD4201-2
dec in the system so the PRIMARY_DN# signal
trace has been removed.
2.7 Component Selection
Great attention was given to the particular components used on the CRD4201-2 board with cost, performance, and package selection as the most
important factors. Listed are some of the guidelines
used in the selection of components:
• No components smaller than 0805 SMT package.
• Only single package passive components. No
resistor packs. This reduces the risk of crosstalk
between analog audio signals.
• All components except connectors, jumpers
and the 24.576 MHz crystal are in surface
mount packages.
• Dual footprints are used for the 24.576 MHz
crystal.
2.8 EMI Components
Optional capacitors and inductors are included to
help the board meet EMI compliance tests, such as
FCC Part 15. Choose these component values according to individual requirements.
3. GROUNDING AND LAYOUT
The component layout and signal routing of the
CRD4201-2 provides a good model for laying out
your own ACR add-in card.
3.1 Partitioned Voltage and Ground
Planes
It is critical for good audio performance to separate
digital and analog sections to prevent digital noise
from effecting the performance of the analog circuits. The analog section of the CRD4201-2 is
completely isolated from the digital section with a
100 mil partition. Partitioning is defined as the absence of copper on all signal layers. The analog and
digital sections each have their own separate
ground planes. All analog components, power traces, and signal traces are routed over the analog
ground plane. Digital components, power traces
and signal traces are not allowed to crossover into
the analog section.
The CS4201 audio codec is placed at the transition
point between the analog and digital ground planes.
The pins are arranged on the CS4201 so that the analog and digital signals are separated from each
other. The analog and digital ground planes must
be tied together for the CS4201 to maintain proper
voltage references. For best results, the two ground
planes are tied together with a single 50 mil trace
under the CS4201 near its digital ground pins.
Data converters are generally susceptible to noise
on the crystal pins. In order reduce noise from coupling onto these pins, the area around the 24.576
MHz crystal and its signal traces is filled with copper on the top and bottom of the PCB and attached
to digital ground.
A separate chassis ground provides a noise-free
reference point for all of the EMI suppression components. The chassis ground plane is connected to
the analog ground plane at the external jacks.
3.2 CS4201 Layout Notes
Refer to the CS4201 Data Sheet for analog and digital partitioning guidelines and bypass capacitors
placement. Pay special attention to the bypass capacitors on REFFLT, AFLT1, AFLT2 and the
power supply capacitors.
DS483RD2A2 5
4. REFERENCES
1) Intel®, Audio Codec ‘97 Component Specification, Revision 2.1, May 22, 1998.
http://developer.intel.com/ial/scalableplatforms/audio/
CRD4201-2
2) ACR Special Interest Group, ACR Specification 1.0
http://www.acrsig.org/
3) Cirrus Logic, CS4201 Audio Codec ‘97 Data Sheet
http://www.cirrus.com/products
4) Steve Harris, Clif Sanchez, Personal Computer Audio Quality Measurements
http://www.cirrus.com/pubs/meas100.pdf
5) Microsoft, PC Design Guidelines
http://www.microsoft.com/hwdev/desguid/
6) M. Montrose, Printed Circuit Board Design Techniques for EMC Compliance (2nd edition), IEEE
Press, New York: 2000.
,
, Version 1.0
4.1 ADDENDUM
• Schematic drawings
• Layout drawings
• Bill of materials
6 DS483RD2A2
CRD4201-2
ANALOG_IN
ANALOG_IN
LINE_IN_L
LINE_IN_R
CD_IN_L
CD_IN_R
CD_COM
VIDEO_IN_L
VIDEO_IN_R
AUX_IN_L
AUX_IN_R
MIC_IN
PHONE_IN
MONO_OUT
PC_BEEP
CS4201
LINE_IN_L
LINE_IN_R
CD_IN_L
CD_IN_R
CD_COM
VIDEO_IN_L
VIDEO_IN_R
AUX_IN_L
AUX_IN_R
MIC_IN
PHONE_IN
MONO_OUT
PC_BEEP
CS4201
ACR_BUS
ACR_BUS
PRIM_DN#
PRIM_DN#
ANALOG_OUT
LINE_OUT_L
LINE_OUT_R
VREFOUT
HP_OUT_L
HP_OUT_R
HP_OUT_C
SDOUT
ABITCLK
ASDOUT
ASYNC
ARST#
ARST#
ASYNC
ABITCLK
SPDIF/SDO2
ASDIN
ASDIN
ASDOUT
SCLK
LRCLK
SPDIF/SDO2
SPDIF_TX
LINE_OUT_L
LINE_OUT_R
VREFOUT
HP_OUT_L
HP_OUT_R
HP_OUT_C
ANALOG_OUT
SERIAL PORT
SDOUT
SCLK
LRCLK
SPDIF/SDO2
ABITCLK
SERIAL PORT
SPDIF_OUT
SPDIF_TX
SPDIF_OUT
Figure 1. Block Diagram
DS483RD2A2 7
CRD4201-2
DGND AGND
LINE_OUT_L
ASDOUT
ASYNC
ASDIN
ABITCLK
R1 47
ARST#
R2 47
HP_OUT_L
LINE_OUT_R
MONO_OUT
SPDIF/SDO2
HP_OUT_R
PRIM_DN#
SCLK
LRCLK
SDOUT
HP_OUT_C
NOTE: In order to be
compatible with a wider
range of motherboards, the
PRIMARY_DN# trace has been
physically cut on the
CRD4201-2.
10
5
42
26
AVss2
AVss1
U1 CS4201
AVdd2
AVdd1
38
25
+5VA
+3.3VD
6
4
7
8
11
DVss1
DVss2
DVdd1
DVdd2
1
9
SYNC
BIT_CLK
PC_BEEP12PHONE13AUX_L14AUX_R15VIDEO_L16VIDEO_R17CD_L18CD_GND19CD_R20MIC121MIC222LINE_IN_L23LINE_IN_R
RESET#
SDATA_IN
SDATA_OUT
37
39
41
36
35
MONO_OUT
HP_OUT_L
HP_OUT_R
LINE_OUT_R
LINE_OUT_L
24
SPDO/SDO248EAPD/SCLK
47
REFFLT27Vrefout28AFLT129AFLT2
45
31
40
44
43
DGND
ID1#46ID0#
HPCFG
HP_OUT_C
GPIO1/SDOUT
GPIO0/LRCLK
GND TIE 0.050 inches
FLTO34FLTI33FLT3D
XTL_IN2XTL_OUT
C10
C9
3
1000pF
NPO
0.01uF
X7R
32
30
AGND
C15
22pF
NPO
Y1
24.576 MHz
C14
22pF
NPO
DGND DGND
Figure 2. CS4201 Audio Codec
MIC_IN
CD_IN_L
PC_BEEP
PHONE_IN
C4
0.1uF
X7R
C3
0.1uF
X7R
+5VA
C2
0.1uF
X7R
C1
0.1uF
X7R
+3.3VD
AGNDDGND
VIDEO_IN_R
AUX_IN_L
VIDEO_IN_L
AUX_IN_R
LINE_IN_L
CD_COM
LINE_IN_R
CD_IN_R
VREFOUT
C8
1000pF
NPO
C13
1000pF
C7
C6
C5
1000pF
NPO
0.1uF
X7R
2.2uF
Y5V
AGND
NPO
MONO_OUT
C12
1000pF
NPO
LINE_OUT_R
C11
1000pF
NPO
LINE_OUT_L
AGND
8 DS483RD2A2
CRD4201-2
CD
IN
LINE IN
LINE_IN_R
+
ELEC
C17 2.2uF
R4 6.8K
43521
J1
R6 6.8K
AGND
LINE_IN_L
+
ELEC
C21 2.2uF
R8 6.8K
R10 6.8K
AGND
C20
100pF
NPO
C19
100pF
NPO
CGND
AGND
Connect CGND
to AGND at
the jack
MIC IN
+5VA
R15 1.5K
R14 2.2K
J3
452
MIC_IN
PC_BEEP
Y5V
C24 1uF
C29
NO POP
AGNDAGND
-3 dB corners at 60 Hz
and 13.8 kHz
(Ri >= 28 kOhm)
R17 100
C28
10uF
ELEC
+
C27
100pF
NPO
C26
100pF
NPO
CGND
AGND
1
Connect CGND
to AGND at
the jack
X7R
C31 0.1uF
C32
2700pF
X7R
R23
4.7K
AGND AGND
R21 47K
L7
31@100MHz
DGND
1
2
J6
PC SPEAKER IN
Figure 3. Analog Inputs
CD_IN_L
+
ELEC
C22 2.2uF
R12 47K
R11 100
L3
31@100MHz
VIDEO_IN_R
+
ELEC
C23 2.2uF
R13 6.8K
L4
4
R5 47K
AGND
31@100MHz
CD_COM
+
ELEC
C18 4.7uF
R7 100
L2
123
R9 47K
AGND AGND
31@100MHz
CD_IN_R
+
ELEC
C16 2.2uF
R3 100
L1
4
R16 6.8K
AGND
31@100MHz
VIDEO_IN_L
+
ELEC
C25 2.2uF
R19 6.8K
R18 6.8K
AGND
L5
31@100MHz
AGND
123
AUX_IN_R
+
ELEC
C30 2.2uF
R22 6.8K
R20 6.8K
AGND AGND
L6
31@100MHz
4
AUX_IN_L
+
ELEC
C33 2.2uF
R25 6.8K
R24 6.8K
L8
31@100MHz
AGND
123
PHONE_IN
+
ELEC
C34 2.2uF
R26 6.8K
L9
R27 6.8K
AGND
31@100MHz
4
MONO_OUT
+
ELEC
C35 2.2uF
R29
47K
R28 0
L10
31@100MHz
AGND AGND
123
J2
J4
VIDEO IN
J5
AUX IN
J7
INTERNAL MODEM CONNECTION
DS483RD2A2 9
SURROUND JACK
(REAR CHANNEL OUTPUT)
CRD4201-2
Connect CGND
to AGND at
2700pF
X7R
the jack
AGND
CNT/LFE JACK
J9
4
2
1
J8
4
2
1
C39
C46
Connect CGND
2700pF
X7R
to AGND at
the jack
AGND
C42
C41
0.1uF
0.1uF
CGND
AGND
AGND
X7R
X7R
C38
2700pF
X7R
R30 560
R31 560
ELEC
ELEC
+
+
C36 10uF
C37 10uF
+5VA
7
6
5
8
VA+
AGND
AOUTR
R35
47K
R34
47K
R33
270K
R32
270K
AOUTL
(CENTER CHANNEL AND SUB-WOOFER)
R36 560
C43 10uF
ELEC
+
5
AOUTR
C45
2700pF
X7R
R37 560
ELEC
+
C44 10uF
7
6
8
VA+
AGND
R41
47K
47K
R40
R39
270K
R38
270K
AOUTL
CGND
AGND
AGND
AGND
Figure 4. Rear, Center, and Sub-Woofer Outputs
U2 CS4334
SDATA1DEM#/SCLK2LRCK3MCLK
SDOUT
C40
10uF
ELEC
+
4
+5VA
U3 CS4334
SDATA1DEM#/SCLK2LRCK3MCLK
AGND
4
LRCLK
SCLK
SPDIF/SDO2
ABITCLK
10 DS483RD2A2
CRD4201-2
J10
4
2
LINE OUT JACK
1
Connect CGND
to AGND at
the jack
AGND
J11
4
2
HEADPHONE JACK
1
Connect CGND
to AGND at
the jack
AGNDAGND
(FRONT CHANNEL OUTPUTS)
C58
100pF
NPO
C57
100pF
NPO
R49
10K
R48
10K
CGND
C48 10uF
C51
100pF
NPO
C50
100pF
NPO
R45
220K
R44
220K
ELEC
ELEC
+
+
C49 10uF
+5VA
C52
0.1uF
CGND
AGND
C55 220uF
ELEC
ELEC
+
+
C56 1uF
ELEC
+
X7R
Vee Vcc
AGND
C54 220uF
+5VA
1
U4A
84
MC34072D
+
-
3
2
22pF
NPO
AGND
R42 33K
C47
7
U4B
MC34072D
NPO
+
C53 22pF
5
6
R46 33K
Figure 5. Front Channel and Headphone Outputs
R43 27K
VREFOUT
R47 27K
HP_OUT_R
HP_OUT_L
LINE_OUT_R
LINE_OUT_L
HP_OUT_C
DS483RD2A2 11
CRD4201-2
SPDIF_TX
+5VD
R50 8.2K
C59
0.1uF
X7R
DGND
Figure 6. S/PDIF Optical Output
J12
4
3
2
1
TOTX-173
5
DGND
6
DGND
12 DS483RD2A2
CRD4201-2
C61
10uF
ELEC
+
C60
0.1uF
X7R
+5VD
+3.3VD
DGND
SPDIF/SDO2
C63
10uF
ELEC
+
+3.3VD
C62
0.1uF
X7R
DGND
4.7K
R56
+3.3VDASYNC
R55
4.7K
SPDIF_TX
ASDIN
ABITCLK
R57
NO POP
8
Vcc
R58
0
C64
0.1uF
X7R
DGND DGND
SDA
SCL
5
7
WP
SCL6SDA
A1
P1
A6
A2
A5
A7
GND
RSVD(1)A3RSVD(2)A4RSVD(3)
MONO_PHONE
AUDIO_PWRDN
AUDIO_MUTE#B1AGNDB2MONO_OUT/PC_BEEPB3RSVD(4)B4RSVD(5)B5PRIMARY_DN#B6-12VB7GNDB8+12VB9GND
NC11NC22NC33Vss
U5
R51 0
+3.3VD
R52 NO POP
populate only one
resistor
A9
A8
USB_OC#
+5Vdual/+5Vsb
GND
A10
A11
USB+
USB-
A12
A14
A13
GND
S/PDIF_IN
GND
R53 NO POP
R54 47
populate R54 for primary codec
populate R53 for secondary codec
DGND
A16
A18
A20
A22
A19
A15
A17
GND
GND
SYNC
+3.3Vdual/+3.3Vsb
A24
A21
A23
GND
GND
SDA
BITCLK
SDATA_IN1
SDATA_IN0
24LC09
4
DGND
C67
+C66
EEPROM address "0xB0"
10uF
ELEC
AGNDDGND
Figure 7. ACR Connector
+5VD
GND
RSVD(6)
RSVD(7)
+3.3VD
GND
SDATA_OUT
RESET#
SDATA_IN3
GND
SDATA_IN2
GND
MSTRCLK
SCL
ACR Connector
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
DGND
+12VD
+5VD
+3.3VD
3
OUT
U6
+12VD +5VA
MC78M05C
GND
2
IN
1
10uF
ELEC
+
ASDOUT
NOTE: In order to be
compatible with a wider
range of motherboards, the
PRIMARY_DN# trace has been
PRIM_DN#
physically cut on the
CRD4201-2.
ARST#
C65
0.1uF
X7R
DS483RD2A2 13
CRD4201-2
Figure 8. PCB Layout: Top Assembly Drawing
14 DS483RD2A2
CRD4201-2
Figure 9. PCB Layout: Top Layer
DS483RD2A2 15
CRD4201-2
Figure 10. PCB Layout: Bottom Layer
16 DS483RD2A2
CRD4201-2
Figure 11. PCB Layout: Drill Drawing
DS483RD2A2 17
CRD4201-2
Figure 12. PCB Layout: Top Silkscreen
18 DS483RD2A2
CRD4201-2
C42,C52,C59,C60,C62,C64,
5. BILL OF MATERIALS
C65
Item Quantity Reference Manufacturer Part Number Description
1 14 C1,C2,C3,C4,C6,C31,C41, KEMET C0805C104K5RAC CAP, 0805, X7R, .1uF, 10%, 50V
2 1 C5 KEMET C1206C225M8VAC CAP, 1206, Y5V, 2.2uF, 20%, 10V
3 6 C7,C8,C10,C11,C12,C13 KEMET C0805C102K5GAC CAP, 0805, C0G, 1000pF, 10%, 50V
4 1 C9 KEMET C0805C103K5RAC CAP, 0805, X7R, .01uF, 10%, 50V
5 4 C14,C15,C47,C53 KEMET C0805C220K5GAC CAP, 0805, C0G, 22pF, 10%, 50V
6 10 C16,C17,C21,C22,C23,C25, PANASONIC ECE-V1VS2R2SR CAP, SMT A, ELEC, 2.2uF, 20%, 35V
C30,C33,C34,C35
7 1 C18 PANASONIC ECE-V1ES4R7SR CAP, SMT A, ELEC, 4.7uF, 20%, 25V
8 4 C19,C20,C26,C27 KEMET C0805C101J5GAC CAP, 0805, COG, 100pF, 5%, 50V
9 1 C24 KEMET C0805C105M8VAC CAP, 0805, Y5V, 1uF, 20%, 10V
10 12 C28,C36,C37,C40,C43,C44, PANASONIC ECE-V1CA100R CAP, SMT B, ELEC, 10uF, 20%, 16V
C48,C49,C61,C63,C66,C67
11 1 C29 NO POP NO POP NO POP
12 5 C32,C38,C39,C45,C46 KEMET C0805C272K5RAC CAP, 0805, X7R, 2700pF, 10%, 50V
13 4 C50,C51,C57,C58 KEMET C0805C101J5GAC CAP, 0805, C0G, 100pF, 5%, 50V
14 2 C54,C55 PANASONIC ECE-V0GA221P CAP, SMT D, ELEC, 220uF, 20%, 4V
15 1 C56 PANASONIC ECE-V1HA010R CAP, SMT B, ELEC, 1uF, 20%, 50V
16 1 J1 LZR ELECTRONICS SJ372 CONN, 1/8" DOUBLE SW. STEREO PHONE JACK
17 4 J2,J4,J5,J7 MOLEX 70553-0003 HDR, 4X1, 0.025" PIN, 0.1" CTR, 15u" AU
18 1 J3 LZR ELECTRONICS SJ374 CONN, 1/8" SINGLE SW. STEREO PHONE JACK
19 1 J6 MOLEX 70553-0036 HDR, 2X1, 0.025" PIN, 0.1" CTR, 150u" SN/PB
20 4 J8,J9,J10,J11 LZR ELECTRONICS SJ373 CONN, 1/8" NON-SW. STEREO PHONE JACK
DS483RD2A2 19
CRD4201-2
L9,L10
21 1 J12 TOSHIBA TOTX173 CONN, OPTICAL TOSLINK TRANSMITTER
22 10 L1,L2,L3,L4,L5,L6,L7,L8, TDK HF50ACB321611-T IND, FBEAD, 1206, 31@100MHz, 25%
23 1 P1 NONE EDGE CONNECTOR ACR BUS CONNECTOR
24 3 R1,R2,R54 PHILIPS 9C08052A47R0J RES, SO, 0805, 47, 5%, 1/10W, METAL FILM
25 4 R3,R7,R11,R17 PHILIPS 9C08052A1000J RES, SO, 0805, 100, 5%, 1/10W, METAL FILM
26 14 R4,R6,R8,R10,R13,R16,R18, PHILIPS 9C08052A6801F RES, SO, 0805, 6.8K, 1%, 1/10W, METAL FILM
R19,R20,R22,R24,R25,R26,
R27
27 9 R5,R9,R12,R21,R29,R34, PHILIPS 9C08052A4702J RES, SO, 0805, 47K, 5%, 1/10W, METAL FILM
R35,R40,R41
28 1 R14 PHILIPS 9C08052A2201J RES, SO, 0805, 2.2K, 5%, 1/10W, METAL FILM
29 1 R15 PHILIPS 9C08052A1501J RES, SO, 0805, 1.5K, 5%, 1/10W, METAL FILM
30 3 R23,R55,R56 PHILIPS 9C08052A4701J RES, SO, 0805, 4.7K, 5%, 1/10W, METAL FILM
31 3 R28,R51,R58 PHILIPS 9C08052A0R00J RES, SO, 0805, 0, 5%, 1/10W, METAL FILM
32 4 R30,R31,R36,R37 PHILIPS 9C08052A5600J RES, SO, 0805, 560, 5%, 1/10W, METAL FILM
33 4 R32,R33,R38,R39 PHILIPS 9C08052A2703J RES, SO, 0805, 270K, 5%, 1/10W, METAL FILM
34 2 R42,R46 PHILIPS 9C08052A3302F RES, SO, 0805, 33K, 1%, 1/10W, METAL FILM
35 2 R43,R47 PHILIPS 9C08052A2702F RES, SO, 0805, 27K, 1%, 1/10W, METAL FILM
36 2 R45,R44 PHILIPS 9C08052A2203J RES, SO, 0805, 220K, 5%, 1/10W, METAL FILM
37 2 R48,R49 PHILIPS 9C08052A1002J RES, SO, 0805, 10K, 5%, 1/10W, METAL FILM
38 1 R50 PHILIPS 9C08052A8201J RES, SO, 0805, 8.2K, 5%, 1/10W, METAL FILM
39 2 R52,R57 NO POP NO POP NO POP
40 1 R53 NO POP NO POP NO POP
41 1 U1 CIRRUS LOGIC CS4201-JQ IC, TQFP, AC ’97 2.1 SERIAL CODEC W/ HP AMP + SRC
20 DS483RD2A2
CRD4201-2
42 2 U2,U3 CIRRUS LOGIC CS4334-KS IC, SO, SOIC8, DAC, STEREO
43 1 U4 MOTOROLA MC34072D IC, SO, SOIC8, 34072, SINGLE SUPPLY DUAL OP AMP
44 1 U5 Microchip 24LC09-I/SN IC, SO, SOIC8, SERIAL EEPROM, 4 x 256 x 8
45 1 U6 MOTOROLA MC78M05CDT IC, SO, +5V REGULATOR, DPAK, 4%, 500mA
46 1 Y1 FOX FS24.576 XTAL, 24.576MHz, HC49S, Fund Mode, Par Res
DS483RD2A2 21
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