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PDF CS48540 Data sheet ( Hoja de datos )
| Número de pieza | CS48540 | |
| Descripción | 32-bit Audio Decoder DSP Family | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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CS485xx Family Data Sheet
FEATURES
Cost-effective, High-performance 32-bit DSP
— 300,000,000 MAC/S (multiply accumulates per second)
— Dual MAC cycles per clock
— 72-bit accumulators are the most accurate in the industry
— 24k x 32 SRAM, 2k blocks - assignable to data or program
— Internal ROM contains a variety of configurable sound
enhancement feature sets
— 8-channel internal DMA
— Internal watch-dog DSP lock-up prevention
DSP Tool Set w/ Private Keys for Protecting Customer IP
Configurable Serial Audio Inputs/Outputs
— Configurable for all input/output types
— Maximum 32-bit @ 192 kHz
— Supports 32-bit audio sample I/O between DSP chips
— TDM input modes (multiple channels on same line)
— 192 kHz SPDIF transmitter
— Multi-channel DSD direct stream digital SACD input
Supports Two Different Input Fs Sample Rates
— Output can be master or slave
— Dual processing path capability
— Input supports dual domain slave clocking
— Hardware assist time sampling for sample rate conversion
Integrated Clock Manager/PLL
— Can operate from external crystal, external oscillator
Input Fs Auto Detection
Host & Boot via Serial Interface
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” in low-power mode, 268 µW in standby
Differentiating from the legacy Cirrus multi-standard, multi-
channel decoders, this new CS485xx family 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
associated with multi-channel and virtual-channel sound
enhancements. Target applications are:
— Digital Televisions
— Multimedia Peripherals
— iPod® Docking Stations
— Automotive Head Units
— Automotive Outboard Amplifiers
— HD-DVD & Blu-ray Disc DVD Receivers
— PC Speakers
There are are also a wide variety of licensable DSP codes
available today as seen by the following examples:
®
Cirrus also has developed, or is developing their own royalty-
free versions of popular features sets like Cirrus Bass
Manager, Cirrus Dynamic Volume Leveler, Cirrus Original
Multichannel Surround, Cirrus Virtual Speaker & Cirrus 3D-
Audio.
The CS485xx family is programmed using the Cirrus
proprietary DSP Composer™ GUI development tool.
Processing chains may be designed using a drag-and-drop
interface to place/utilize functional macro audio DSP
primitives. The end result is a software image that is down-
loaded to the DSP via serial host or serial boot modes.
Ordering Information:
See page 20 for ordering information
12 Ch. Audio In /
6 Ch. SACD In
S/PDIF
12 Ch PCM
Audio Out
Serial
Control 1
GPIO
32-bit
DSP
PXY
D
M
A
Debug
Watchdog
TMR1
TMR2
PLL
http://www.cirrus.com
Copyright 2009 Cirrus Logic, Inc.
CONFIDENTIAL
FEB ’09
DS734F3
1 page  
www.DataSheet.in
CS485xx Family Data Sheet
32-bit Audio Decoder DSP Family
1. Documentation Strategy
The CS485xx Family Data Sheet describes the CS485xx family of multichannel audio processors.
This document should be used in conjunction with the following documents when evaluating or
designing a system around the CS485xx family of processors.
Table 1. CS485xx Family Related Documentation
Document Name
Description
CS485xx Family Data Sheet
This document
CS485xx Family Hardware User’s Manual
Includes detailed system design information including
Typical Connection Diagrams, Boot-Procedures, Pin
Descriptions, etc.
AN298 - CS485xx Family Firmware User’s Manual
Includes detailed firmware design information
including signal processing flow diagrams and control
API information
DSP Composer User’s Manual
Includes detailed configuration and usage
information for the GUI development tool.
The scope of the CS485xx Family Data Sheet is primarily the hardware specifications of the
CS485xx family of devices. This includes hardware functionality, characteristic data, pinout, and
packaging information.
The intended audience for the CS485xx Family Data Sheet is the system PCB designer, MCU
programmer, and the quality control engineer.
2. Overview
The CS485xx DSP Family is designed to provide high-performance post-processing and mixing of
digital audio. The dual clock domain provided on the PCM inputs allows for the mixing of audio
streams with different sampling frequencies. The low-power standby preserves battery life for
applications which are always on, but not necessarily processing audio, such as automotive audio
systems.
There are three devices comprising the CS485xx family. The CS48520, CS48540 and CS48560 are
differentiated by the number of inputs and outputs available. All DSPs support dual input clock
domains and dual audio processing paths. All DSPs are available in a 48-pin QFP package. Please
refer to Table 2 on page 7 for the input, output, firmware features of each device.
2.1 Licensing
Licenses are required for all of the 3rd party audio processing algorithms listed in Section 3. Please
contact your local Cirrus Logic Sales representative for more information.
DS734F3
Copyright 2009 Cirrus Logic, Inc.
CONFIDENTIAL
5
5 Page 
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CS485xx Family Data Sheet
32-bit Audio Decoder DSP Family
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 ]
DS734F3
Copyright 2009 Cirrus Logic, Inc.
CONFIDENTIAL
11
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