2DS726PP2
CS4525
Software Mode System Features
Digital Audio Processing
– 5 Programmable Parametric EQ Filters
– Selectable High-Pass Filter
– Bass/Treble Tone Control
– Adaptive Loudness Compensation
– 2-Channel Mixer
– 2.1 Bass Management
– 24 dB/octave Linkwitz-Riley Crossover
Filters
– De-emphasis Filter
Selectable Serial Audio Interface Formats
– Left-Justified up to 24-bit
– I²S up to 24-bit
– Right-Justified 16-, 18-, 20-, 24-bits
Digital Serial Connection to Additional CS4525
or DACs for Subwoofer
Digital Interface to External Lip-Sync Delay
PWM Switch Rate Shifting Eliminates AM
Frequency Interference
Digital Volume Control with Soft ramp
– +24 to -103 dB in 0.5 dB steps
Programmable Peak Detect and Limiter
2-Channel Logic-Level PWM Output
– Programmable Channel Mapping
– Can Drive an External PWM Amplifier,
Headphone Amplifier, or Line-Out Amplifier
– Integrated Headphone Detection
Flexible Power Output Configurations
Thermal Foldback for Interruption-Free
Power-Stage Protection
– Supports Internal and External Power
Stages
Operation from On-Chip Oscillator Driver or
Applied Systems Clock
Supports I²C®Host Control Interface
Hardware Mode System Features
2-Channel Stereo Full-Bridge Power Outputs
Analog and Digital Inputs
I²S and Left-Justified Serial Input Formats
Thermal Foldback for Interruption-Free
Protection of Internal Power Stage
Operation from Applied Systems Clock
External Mute Input
Common Applications
Integrated Digital TV’s
Flat Panel TV Monitors
Computer/TV Monitors
Mini/Micro Shelf Systems
Digital Powered Speakers
Portable Docking Stations
Computer Desktop Audio
General Description
The CS4525 is a stereo analog or digital input PWM
high efficiency Class D amplifier audio system with an
integrated stereo analog-to-digital (A/D) converter. The
stereo power amplifiers can deliver up to 15 W per
channel into 8 Ω speakers from a small space-saving
48-pin QFN package. The PWM amplifier can achieve
greater than 85% efficiency. The package is thermally
enhanced for optimal heat dissipation which eliminates
the need for a heatsink.
The power stage outputs can be configured as two full-
bridge channels for 2 x 15 W operation, two half-bridge
channels and one full-bridge channel for
2 x 7 W + 1 x 15 W operation, or one parallel full-bridge
channel for 1 x 30 W operation. The CS4525 integrates
on-chip over-current, under-voltage, and over-tempera-
ture protection and error reporting as well as a thermal
warning indicator and programmable foldback of the
output power to allow cooling.
The main digital serial port on the CS4525 can support
asynchronous operation with the integrated on-chip
sample rate converter (SRC) which eases system inte-
gration. The SRC allows for a fixed PWM switching
frequency regardless of incoming sample rate as well
as optimal clocking for the A/D modulators.
An on-chip oscillator driver eliminates the need for an
external crystal oscillator circuit, reducing overall design
cost and conserving circuit board space. The CS4525
automatically uses the on-chip oscillator driver in the
absence of an applied master clock.
The CS4525 is available in a 48-pin QFN package in
Commercial grade (-10° to +70° C). The CRD4525-Q1
4-layer, 1 oz. copper and CRD4525-D1 2-layer, 1 oz.
copper customer reference designs are also available.
Please refer to “Ordering Information” on page 97 for
complete ordering information.
