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PDF CRD4299-1 Data sheet ( Hoja de datos )
| Número de pieza | CRD4299-1 | |
| Descripción | AC 97 AMR Reference Design | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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CRD4299-1 AMR
CrystalClear™ AC '97 AMR Reference Design
Features
l AMR Audio Codec add-in card designed to
meet the Intel® Audio/Modem Riser
Specification
l High quality, low cost, 2-layer, single sided
adapter board
l CS4299 SoundFusion® Audio Codec ’97
l Complete suite of Analog and Digital I/O
connections:
- Line In, Line Out, Mic In, Modem Audio
connection, CD Audio In, Video In, Aux In,
Headphone Out and Optical Digital Out
l Meets or exceeds Microsoft’s PC 97, PC 98,
and PC 99, both required and advanced,
audio performance requirements.
Description
The CRD4299-1 AMR add-in board reference design
showcases Cirrus Logic’s Crystal Audio AC ’97 CS4299
SoundFusion, and is Audio/Modem Riser Specifica-
tion[2], compliant. The CRD4299-1 AMR card is 2.7"
high by 3.6" long.
The CRD4299-1 AMR reference design includes a cus-
tomer ready manufacturing kit. Included in the kit are a
full set of schematic design files (OrCAD® 7.2 format),
PCB job files (PADS®ASCII), PCB artwork files
(Gerber) , bracket drawings, and bill of materials. The
design is production ready as is, or can be easily
modified to incorporate specific OEM changes. Docu-
mentation source files are available to assist the OEM to
quickly provide an accurate end user manual.
ORDERING INFO CRD4299-1 AMR
CS4299
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. 1999
(All Rights Reserved)
OCT ‘99
DS319RD1A1
1
1 page  
CRD4299-1 AMR
MC78L05 regulates the AMR +12 V supply down
to provide a clean +5 V analog supply for the
CS4299. The MC78L05 regulator can provide ade-
quate current, which is enough for the CS4299 and
associated analog circuitry.
2.3 Analog I/O
The CS4299 has many analog inputs and outputs
that may or may not be used depending on the sys-
tem’s application. Unused inputs should be tied to
Vrefout (pin 28) or AC coupled via a 0.1 µF capac-
itor to the analog ground plane. The analog section
contains the components for a headphone amplifi-
er. The Modem Audio, CD In, Audio In, and Aux
In headers are also part of the Analog I/O section.
The header and its associated components may or
may not be necessary depending on the audio in-
puts implemented.
2.4 Audio I/O
A full feature set of the CS4299’s analog I/O and
digital out is represented on the reference design
card through internal and external connectors:
• Line Out
• Headphone Out
• Line In
• Mic In
• CD Audio In
• Aux In
• Video In
• Modem Audio connection
• Optical Digital Out
Four external 1/8" jacks, one external TOS-LINK
jack, and four internal header connections are used
for analog and digital inputs and outputs.
2.4.1 Line Out
The output of the CS4299 is capable of driving im-
pedances greater than 10 kΩ with a maximum out-
put voltage of 1 Vrms. The Line Out connection is
made via an external 1/8" jack.
• Maximum output level: 1 Vrms
2.4.2 Headphone Out
An external 1/8" jack is provided for a headphone
connection. This output is driven by an amplifier
for low impedance loads such as 32 Ω headphones.
• Maximum output level: 2.0 Vrms (no load);
1.5 Vrms (32 Ω load)
• Maximum output power: 70 mW/channel
(32 Ω load)
2.4.3 Line In
The Line In 1/8" jack provides an input to the Line
In pins of the CS4299.
• Maximum input level: 2 Vrms
2.4.4 Mic In
The Microphone In 1/8" jack provides an input to a
microphone pre-amplifier circuit that applies 18 dB
of gain to the signal.
• Maximum input level:
- Microphone Boost enabled: 12.5 mVrms
- Microphone Boost disabled: 125 mVrms
• Supports 3-pin electret (power on ring) and 2-
pin dynamic microphones
2.4.5 CD Audio In
The CD Audio input provides a 4-pin (0.1 inch cen-
ter) right-angled connector that is compatible with
the SONY standards and ATAPI.
• Maximum input level: 2 Vrms
• Pseudo differential input using the CD Com-
mon pin as the ground
• 0.1 inch connector wired as:
- Pin 1 : Left Channel
- Pin 2 : Common return
DS319RD1A1
5
5 Page 
CRD4299-1 AMR
CwGRAPH 0.65
LEFT
-60
CrystalWare(tm)
CRD429~1\99-1DXL.ADX
RIGHT
-50
-65 -55
-70 -60
-75 -65
-80 -70
-85 -75
-90 -80
-95 -85
-100
-90
-105
-95
-110
20
100 1 k
Frequency (Hz)
-100
10 k 20 k
Figure 3. Full Duplex (A-D-PC-D-A): Line In/Out THD+N vs. Frequency
CwGRAPH 0.65
LEFT
3
CrystalWare(tm)
CRD429~1\99-1MAL.ADX
RIGHT
6
25
14
03
-1 2
-2 1
-3 0
-4 -1
-5 -2
-6 -3
-7
20 100
1k
Frequency (Hz)
-4
10 k 20 k
Figure 4. Analog Mixer (A-A): Line In/Out Frequency Response
DS319RD1A1
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CRD4299-1.PDF ] | |
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