CRD4525 Datasheet, PDF (1/23 Pages) Cirrus Logic – 2 x 15 W Digital Amplifier Reference Design

CRD4525
2 x 15 W CS4525 Digital Amplifier Reference Design
Features
 Output Filters Optimized for 8 Ω Loads
 Delivers 15 W/Ch into 8 Ω at 10 % THD+N
 Single-Ended 2 V_RMS Stereo Analog Inputs
 Optical and Coaxial S/PDIF Inputs
 Flexible I/O Headers Provided
– PCM Input Signal Interface
– Auxiliary Serial Port Signal Interface
– Delay Port Signal Interface
– PWM Logic Level Signal Interface
 Optional CRD4412 Daughter-Card for
Subwoofer Channel
– Implements a 2.1 Configuration
 Demonstrates Recommended Layout and
Grounding Arrangements
 +18 V Switching Mode Power Supply Included
 Windows^® Compatible Software Interface
– Easy and Intuitive Graphical Interface
– Supports USB PC Connectivity
Description
The CRD4525 demonstrates the CS4525 digital PWM
controller with integrated power stages. This reference
design implements a two-channel amplifier which deliv-
ers 15 W per full-bridge channel into 8 Ω loads using a
single +18 V supply. The CRD4525 is powered by an in-
cluded 80 W switching mode power supply.
Standard RCA phono jacks are provided to easily inter-
face analog input signals with the evaluation board.
Optical and coaxial inputs are provided to interface with
S/PDIF digital audio input signals.
The PWM audio power outputs are routed through an
inductor/capacitor 2^nd order low-pass filter (LPF) to re-
move high frequency components from the output
signal, effectively converting it from digital to analog.
The Windows software provides a GUI to make config-
uration of the CRD4525 easy. The software
communicates through the PC’s USB port to configure
the control port registers so that all features of the
CS4525 can be evaluated.
ORDERING INFORMATION
CRD4525
CS4525 Reference Design
Stereo Analog
Inputs
Optical
Receiver
Coaxial Input
CS8416
S/PIDF
Receiver
PCM
Input
Header
CS4525
Output
Filter
8Ω
Speaker
Connector
Output
Filter
8Ω
Aux Port Header
CRD4412 Interface Header
USB
I/O
http://www.cirrus.com
Micro-controller
Status LED’s
Tactile Controls
Power
Jack
Included 18 V Power Supply
Copyright © Cirrus Logic, Inc. 2006
(All Rights Reserved)
SEPTEMBER '06
DS726RD1