|
|
PDF CRD4202-2 Data sheet ( Hoja de datos )
| Número de pieza | CRD4202-2 | |
| Descripción | AC 97 Six Channel CNR Audio Reference Design | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de CRD4202-2 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
CRD4202-2
AC '97 Six Channel CNR Audio Reference Design with PLL
Features
Phase Locked Loop (PLL) Codec Operation
Six Channel Analog Audio Outputs
Headphone Sense using GPIO
CS4202 codec and two CS4334 DACs
20-bit D to A conversion (DAC)
18-bit A to D conversion (ADC)
S/PDIF (IEC-958) optical digital output
Complete suite of Analog I/O connections:
– Line, Mic, CD, Video, Modem, and Aux Inputs
– Modem, Headphone, Line Front, Line Rear
and Line Center/Sub-Woofer Outputs
2-layer low cost PC board
Complies with Intel ® AC '97 revision 2.2
Exceeds Microsoft’s® PC 2001 audio
performance requirements.
Description
The CRD4202-2 reference design eliminates the cost of
the 24.567 MHz crystal by operating the CS4202 in
Phase Locked Loop (PLL) mode. This reference design
also features six channel analog audio outputs, an opti-
cal S/PDIF digital output, and Communication and
Networking Riser (CNR) interface. This design uses the
CS4202 audio codec which has several advanced fea-
tures including a built-in headphone amplifier,
simultaneous six channel analog and S/PDIF optical
digital output, GPIO for headphone detection, and up to
30 dB of internal microphone boost.
The CRD4202-2 reference design is available by order-
ing the CMK4202-2 manufacturing kit. This kit includes
the CRD4202-2 board, a full set of schematic design
files (OrCAD® format), 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 spe-
cific design goals.
ORDERING INFO
CMK4202-2
(Manufacturing Kit)
Microphone Input
Line Input
Line Output
Headphone Output
Rear Channel Output
Center / Sub-Woofer Output
S/PDIF Digital Optical Output
MIC
IN
INT MODEM
LINE
IN
CD IN
LINE
OUT
VIDEO IN AUX IN
Cirrus Logic
CRD4202-1
HEADPH
OUT
SURR
OUT
CS4202
CNT/LFE
OUT
S/PDIF
OUT
Preliminary Product Information
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.cirrus.com
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
©Copyright Cirrus Logic, Inc. 2002
(All Rights Reserved)
MAR ‘02
DS549RD1B1
1
1 page  
CRD4202-2
the input clock frequency. Location Y2 in Figure 8
is populated with a 14.31818 MHz surface mount-
ed clock oscillator (test clock) to demonstrate the
CS4202 PLL operation.
2.9 Component Selection
Great attention was given to the particular compo-
nents used on the CRD4202-2 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 SMT pack-
age.
• Only single package passive components. No
resistor packs. This reduces the risk of crosstalk
between analog audio signals.
• All components except connectors are in sur-
face mount packages.
2.10 EMI Components
Optional capacitors or inductors may be 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
CRD4202-2 provide a good model for developing
new CNR add-in card designs.
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 affecting the performance of the analog cir-
cuits. The analog section of the CRD4202-2 is
physically isolated from the digital section with a
0.10 inch partition. Partitioning is defined as the
absence of copper on all PCB signal layers. The an-
alog and digital sections have their own separate
ground planes. All analog components, power trac-
es, 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 CS4202 audio codec is placed at the transition
point between the analog and digital ground planes.
The analog and digital ground planes must be tied
together externally for the CS4202 to maintain
proper voltage references. For best results, the two
ground planes are tied together with a single 0.050
inch trace under the CS4202 near its digital ground
pins.
Data converters are generally susceptible to noise
on the crystal pins. In order to reduce noise from
coupling onto these pins, the area around the
24.576 MHz crystal and its signal traces are 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 com-
ponents. The chassis ground plane is connected to
the analog ground plane at the external jacks.
3.2 AC-Link
According to the AC '97 revision 2.2 specification,
the AC-Link signals can have a maximum capaci-
tance (including traces, connectors, and circuitry)
of 47.5 pF on BIT CLK and SDATA_IN (assuming
a single codec). If this capacitance is exceeded,
timing violations may occur and cause the system
to malfunction. In order to avoid adding excessive
capacitance, do not add any EMI capacitors to
ground on any of the AC-Link lines. In addition,
keep the trace length of the AC-Link as short as
possible. Keeping the AC-Link trace length under 8
inches is strongly recommend.
3.3 CS4202 Layout Notes
Refer to the CS4202 Data Sheet for analog and dig-
ital partitioning guidelines and bypass capacitor
placement. Pay special attention to the location of
bypass capacitors on REFFLT, AFLT1, AFLT2,
and the placement of the power supply capacitors.
DS549RD1B1
5
5 Page 
LINE_OUT_R
LINE_OUT_L
GPIO2
HP_OUT_L
HP_OUT_R
HP_OUT_C
C48 1uF
ELEC
C49 1uF
ELEC
C54 220uF
ELEC
C55 220uF
ELEC
C56 1uF
ELEC
R44
220K
R45
220K
C50
100pF
NPO
C51
100pF
NPO
LINE OUT
JACK
J10
4
3
5
2
1
Connect CGND
to AGND at
the jack
AGND
CGND
AGND
+5VA
R56
10K
R48 R49 C57 C58
10K
10K
100pF
100pF
NPO
NPO
HEADPHONE
JACK
J11
7
6
2
3
1
Connect CGND
to AGND at
the jack
AGND
CGND
Figure 5. Front Channel and Headphone Sense Output
AGND AGND
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet CRD4202-2.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| CRD4202-1 | AC 97 Six Channel CNR Audio Reference Design | Cirrus Logic |
| CRD4202-2 | AC 97 Six Channel CNR Audio Reference Design | Cirrus Logic |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |