CS4525 datasheet(2/98 Pages) CIRRUS

2 / 98 page

DS726PP3

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 (0° to +70° C). The CRD4525-Q1 4-

layer, 1 oz. copper and CRD4525-D1 2-layer, 1 oz. cop-

per customer reference designs are also available.

Please refer to “Ordering Information” on page 97 for

complete ordering information.

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