CRD4412
2 x 15 W CS4412 Digital Power Stage Reference Design
Features
Pre-Configured for Stereo Full-Bridge
Operation
– Delivers 15 W/Ch into 8
Ω
at 10 % THD+N
Easily Configurable for Mono Parallel Full-
Bridge Operation
– Delivers 30 W into 4
Ω
at 10 % THD+N
Directly Connects to CRD4525 Digital Amplifier
Reference Design
– Implements a 2.1 Configuration
Flexible I/O Provided
– PWM Logic Level Signal Inputs
– CS4412 Error and Warning Signals
Operates from +9 V to +18 V and +3.3 V
Demonstrates Recommended Layout and
Grounding Arrangements
Implements Recommended PWM Output
Filtering
Description
The CRD4412 demonstrates the CS4412 digital ampli-
fier power stage. This reference design is pre-
configured as a two-channel full-bridge power stage
which delivers 15 W per channel into 8
Ω
loads using a
single +18 V supply. The design can be easily config-
ured to operate as a single channel parallel full-bridge
power stage capable of delivering 30 W into a 4
Ω
load
from an +18 V supply. The CRD4412 can be powered
from +9 V to +18 V
The CRD4412 is designed to operate in conjunction
with the CRD4525. When connected, the combination
implements a 2.1 configuration with the CRD4412 oper-
ating in mono parallel full-bridge mode.
The CRD4412 can also be operated without an at-
tached CRD4525. In this configuration, all input/output
connections are achieved through the CRD4412 inter-
face header.
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.
ORDERING INFORMATION
CRD4412
CS4412 Reference Design
CRD4412 Interface Header
Right PWM
Left PWM
Mono
Parallel
Full-Bridge
Stereo
Full-Bridge
Over Current Error
Under Voltage/Temp Error
Thermal Warning
Power
Reset
CS4412
Output
Filter
Copyright
©
Cirrus Logic, Inc. 2006
(All Rights Reserved)
DECEMBER '06
DS749RD1
Speaker Connector
Output
Filter
CIRRUS [ CIRRUS LOGIC ]
