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PDF CRD4205-1 Data sheet ( Hoja de datos )
| Número de pieza | CRD4205-1 | |
| Descripción | Notebook Audio Docking Station Example | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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CRD4205-1
CrystalClear® Notebook Audio Docking Station Example
Features
l Emulates Docking Station Environment
– Simulates audio portion of a notebook
computer
– “Docks” to the CRD4205-2
l Features the CS4205 AC ‘97 audio codec.
– 18-bit Analog to Digital Converters (ADCs)
– 20-bit Digital to Analog Converters (DACs)
– Digital mixer
– Integrated digital effects
l Four stereo and two mono analog inputs
l Digital ZV port input
l Five GPIO pins
l CNR interface
l S/PDIF (IEC-958) digital output
l Crystal, oscillator, or PLL operation
l Exceeds Microsoft PC-99 and PC-2001
audio performance requirements
Description
The CRD4205-1 reference design features the CS4205
AC ‘97 audio codec and emulates the audio sub-system
in a PC notebook computer. The CRD4205-1 can be
used alone or with the CRD4205-2 companion card. The
CRD4205-2 companion card simulates the audio sub-
system in a PC digital docking station.
This reference design features stereo analog audio in-
puts for Line, CD, Video, and Aux inputs. In addition, the
card has mono analog inputs for Microphone, Modem
Audio, and PC Beep. It also has several advanced fea-
tures including a ZV port digital input and a S/PDIF digital
output.
The CRD4205-1 is available by ordering the CMK4205-
3 manufacturing kit. This kit includes a full set of sche-
matics (OrCAD® 7.2 format), PCB job files (PADS®
ASCII), PCB Gerber files, and bill of materials. In addi-
tion, WDM audio drivers that support Windows 98se,
Millennium®, and Windows 2000 are also included.
ORDERING INFORMATION
CMK4205-3 Manufacturing Kit for the CRD4205-1
INT MODEM CD IN
VIDEO IN
MIC
IN
AUX IN
LINE
IN
LINE / HEADPHONE
OUT
CS4205
Cirrus Logic
CRD4205-1_REVB
S/PDIF
OUT
Preliminary Product Information
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2001
(All Rights Reserved)
FEB ‘01
DS489RD1A2
1
1 page  
CRD4205-1
.
Jumper
Pins 1-2
JP1 Reset from CNR
Codec Reset
Bus
JP2 3.3 V from CNR
3.3 V supply
Bus
JP3 From CNR Bus
Primary Down
JP8 From CNR Bus
Secondary Down
JP4 SDATA_IN0
SDIN Target
JP9 Places pull-up
Primary Down on Primary Down
when inserted.
Pins 2-3
Force Low
Not Used
Force Low
Force Low
SDATA_IN1
NA
(2 pin jumper)
Table 2. CNR Connector Jumper Settings
Note:The CRD4205-1 default positions for all jumpers is
between pins 1-2
JP9 inserts a 1 kΩ pull-up on Primary Down. This
is used to disable on-board audio for motherboards
that have a 10 kΩ pull-down resistor on Primary
Down as required by the CNR 1.1 specification.
In addition, JP3 and JP8 can be used to determine
the clocking mode of the CS4205. The CS4205
supports three clocking modes: oscillator (Osc),
crystal (Xtal), and AC-Link bit clock (BIT_CLK).
This is shown in table 3.
JP8 JP3 ID Osc PLL
1-2 1-2 0 Osc no
1-2 2-3 0 Osc yes
2-3 1-2 0 Osc yes
2-3 2-3 0 Osc yes
1-2 1-2 0 Xtal no
1-2 2-3 1 Bclk no
2-3 1-2 2 Bclk no
2-3 2-3 3 Bclk no
Frequency
24.576 MHz
14.318 MHz
27.000 MHz
48.000 MHz
24.576 MHz
12.288 MHz
12.288 MHz
12.288 MHz
Mode
Primary
Primary
Primary
Primary
Primary
Secondary
Secondary
Secondary
Table 3. JP8 and JP3 Positions for Each Clock Mode
The CS4205 requires both digital +3.3 V and ana-
log +5 V supply. The digital power is supplied
from the CNR connector. A Motorola MC78M05C
regulates the +12 V supply from the CNR bus
down to a clean +5 V analog supply. This +5 V lin-
ear regulator is used to maintain good audio quali-
ty.
2.8 Component Selection
Great attention was given to the particular compo-
nents used on the CRD4205-1 board with cost, per-
formance, 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 package.
• Only single package components passive com-
ponents. No resistor packs. This reduces the
risk of crosstalk between audio signals.
• All ICs are surface mount.
• Dual footprint for XTAL. Standard H49S and
small circular CA-301 pin in hole package.
2.9 EMC Components
Optional capacitors and inductors are included to
help the board meet EMI compliance tests, such as
FCC Part 15. Choose these component values ac-
cording to individual requirements.
3. GROUNDING AND LAYOUT
One of the most critical aspects of PC audio design
is good PC board layout. The PC is a hostile envi-
ronment for audio and good layout is essential for
achieving high audio quality.
The CRD4205-1 is partitioned into a digital and an-
alog sections to help isolate noisy digital circuitry
from quiet analog audio circuitry. The most impor-
tant rule for successful PC audio layout is to keep
all digital signal traces and components over the
digital ground plane, and all analog signal traces
and components over an analog ground plane.
These planes are separated by a minimum of 60 to
100 mils (0.060 to 0.100 inches). Do not allow dig-
ital and analog signals to cross planes, otherwise
digital noise may be induced into the analog signals
and severely reduce audio performance.
The CS4205 is placed at the transition point of the
analog and digital ground planes. The CS4205 pins
are partitioned into analog and digital areas. This is
5
5 Page 
LINE_OUT_R
VREF
LINE_OUT_L
R43 27K
R47 27K
R42 33K
C47 22pF
NPO
+5VA
3
+
2
-
U4A
1
MC34072D
AGND
R46 33K
C53 22pF
NPO
+5VA
5
+
6
-
U4B
7
MC34072D
AGND
C48 10uF
ELEC
C49 10uF
ELEC
+5VA
C52
0.1uF
X7R
R44
220K
AGND
AGND
R45
220K
C50
100pF
NPO
C51
100pF
NPO
LINE OUT
JACK
J10
4
2
1
PHONO-1/8
Connect CGND
to AGND at
the jack
AGND
AGND
Figure 5. Analog Outputs
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet CRD4205-1.PDF ] | |
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