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PDF CS48AU2B Data sheet ( Hoja de datos )
| Número de pieza | CS48AU2B | |
| Descripción | high-performance 32-bit DSP | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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CS48AU2B Data Sheet
FEATURES
World’s first cost-effective, high-performance 32-bit DSP
that is solely dedicated to enable Audyssey Laboratories
audio processing technologies for today’s high-volume
consumer electronic products
Features: Audyssey Dynamic VolumeTM, Audyssey Dynamic
EQTM, Audyssey EQTM & Audyssey BassXTTM/BassXT-TVTM
Audyssey Dynamic Volume eliminates the need for
constant volume adjustments
Audyssey Dynamic EQ enables a reference playback
experience at any desired playback level
Audyssey EQ removes much of the distortion caused by
speaker enclosures and the typical room environment
producing greatly improved sound compared to similar
products without correction
Audyssey BassXT and BassXT-TV are specifically
calibrated to enhance the physical bass response of each
product model
Configurable Serial Audio Inputs/Outputs
— Maximum 32-bit @ 192 kHz
(Note: Audyssey Laboratories algorithms support 48 kHz,
44.1 kHz and 32 kHz)
— Integrated 192 kHz capable S/PDIF transmitter
Integrated Clock Manager/PLL
— Can operate from external crystal, external oscillator
Input Fs Auto Detection & Coefficient Loading
Host Control & Boot via Serial Interface
Support for Master (Self) Boot via Serial EEPROM for
single Fs applications (i.e. 48 kHz only via ADC input)
Configurable GPIOs and External Interrupt Input
1.8V Core and a 3.3V I/O that is tolerant to 5V input
Low-power Mode
— “Energy Star® Ready” via low-power mode, 268 µW in
standby
The brand new CS48AU2B device is still based on the same
high-performance 32-bit fixed point Digital Signal Processor
core but instead is equipped with much less memory, tailoring
it for more cost-effective applications which feature Audyssey
Laboratories audio processing technologies. Target
applications are:
— Digital Televisions
— iPod® Docking Stations
— Automotive Head Units (OEM and Aftermarket)
— Automotive Outboard Amplifiers (OEM and Aftermarket)
— Blu-ray® Disc Receivers
— Soundbars / Sound Projectors
The following Audyssey Laboratories algorithms are currently
supported on the CS48AU2B and more are in development:
While the individual Audyssey processing algorithms have
already been implemented on this DSP, the CS48AU2B is
programmed using the Cirrus proprietary DSP Composer™
GUI development tool.
Processing chains combining both standard signal
processing blocks (Tone Control, Bass Management, etc.) in
combination with any combination of Audyssey Laboratories
technology algorithm blocks may be designed using a simple
drag-and-drop interface to create a custom signal flow
specific to your product model. The end result of this is a
software image that is down-loaded to the DSP via serial host
(I2C® or SPITM) or via a serial master (self) boot.
Support for loading of the various Audyssey Laboratories
algorithm coefficient files supplied by Audyssey Laboratories
is easily supported via DSP Composer, enabling the
OEM/ODM to quickly be able to generate the necessary files
for the system microcontroller which have been custom
tailored for each specific model based on the measurement
and analysis performed by Audyssey Laboratories.
Ordering Information:
See page 21 for ordering information
M u ltic ha nne l
Audio In
S /P D IF
M u ltic ha nne l
Audio Out
Serial
Control 1
GPIO
32-bit
DSP
PXY
D
M
A
Debug
W atchdog
TMR1
TMR2
PLL
http://www.cirrus.com
Copyright 2009 Cirrus Logic
CONFIDENTIAL
MAY ’09
DS876F3
1 page  
CS48AU2B Data Sheet
Dedicated 32-bit Audio DSP for Audyssey Laboratories Technology
1. Documentation Strategy
The CS48AU2B Data Sheet describes the CS48AU2B audio processor. This document should be
used in conjunction with the following documents when evaluating or designing a system around the
CS48AU2B of processors.
Table 1. CS48AU2B Related Documentation
Document Name
CS48AU2B Data Sheet
CS485xx Hardware User’s Manual
AN298 - CS485xx Firmware User’s Manual
DSP ComposerTM User’s Manual
AN298PPMQ, Audyssey Dynamic VolumeTM
Audyssey Dynamic EQTM Firmware Module
Application Note
AN298PPMR, Audyssey EQTM Firmware Module
Application Note
AN298PPMS, Audyssey BassXTTM Firmware
Module Application Note
Description
This document
Includes detailed system design information including
Typical Connection Diagrams, Boot-Procedures, Pin
Descriptions, etc.
Includes detailed firmware design information
including signal processing flow diagrams and control
API information for the operating system.
Includes detailed configuration and usage
information for the GUI development tool.
Contains description of API used to control Audyssey
Dynamic Volume and Audyssey Dynamic EQ
firmware.
Contains description of API used to control Audyssey
EQ firmware.
Contains description of API used to control Audyssey
BassXT firmware.
The scope of the CS48AU2B Data Sheet is primarily the hardware specifications of the CS48AU2B
of devices. This includes hardware functionality, characteristic data, pinout, and packaging
information.
The intended audience for the CS48AU2B Data Sheet is the system PCB designer, MCU
programmer, and the quality control engineer.
2. Overview
The CS48AU2B DSP is designed to provide high-performance post-processing and mixing of digital
audio. The low-power standby preserves battery life for applications which are always on, but not
necessarily processing audio, such as automotive audio systems. The CS48AU2B is available in a
48-pin QFP package. Please refer to Table 2 on page 7 for the input, output and suggested
applications for this device.
2.1 Licensing
Licenses are required for any of the Audyssey Laboratories algorithms listed in Section 3. Please
trademarks.
DS876F3
Copyright 2009 Cirrus Logic
CONFIDENTIAL
5
5 Page 
CS48AU2B Data Sheet
Dedicated 32-bit Audio DSP for Audyssey Laboratories Technology
5.4 Power Supply Characteristics
(Measurements performed under operating conditions)
Parameter
Operational Power Supply Current:
VDD: Core and I/O operating1
VDDA: PLL operating
VDDIO: With most ports operating
Total Operational Power Dissipation:
Min Typ Max Unit
- 203 -
-8-
- 27 -
480
mA
mA
mA
mW
Standby Power Supply Current:
VDD: Core and I/O not clocked
VDDA: PLL halted
VDDIO: All connected I/O pins 3-stated by other ICs in system
Total Standby Power Dissipation:
1. Dependent on application firmware and DSP clock speed.
5.5 Thermal Data (48-Pin LQFP)
Parameter
Symbol
Junction Temperature
Tj
Thermal Resistance (Junction to Ambient)
Two-layer Board1
Four-layer Board2
θja
Thermal Resistance (Junction to Top of Package)
Two-layer Board3
Four-layer Board4
ψjt
-
-
-
-
Min
-
-
-
-
-
100 -
1-
50 -
348 -
μA
μA
μA
μW
Typ Max
- 125
Unit
°C
63.5 - °C / Watt
54 -
0.70 - °C / Watt
0.64 -
1. Two-layer board is specified as a 76 mm X 114 mm, 1.6 mm thick FR-4 material with 1-oz. copper covering 20 % of the top &
bottom layers.
2. Four-layer board is specified as a 76 mm X 114 mm, 1.6 mm thick FR-4 material with 1-oz. copper covering 20 % of the top &
bottom layers and 0.5-oz. copper covering 90 % of the internal power plane & ground plane layers.
3. To calculate the die temperature for a given power dissipation
T θj = Ambient Temperature + [ (Power Dissipation in Watts) * ja ]
4. To calculate the case temperature for a given power dissipation
Tc = Tj - [ (Power Dissipation in Watts) * ψjt ]
DS876F3
Copyright 2009 Cirrus Logic
CONFIDENTIAL
11
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