CRD4525 Просмотр технического описания (PDF) - Cirrus Logic

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CRD4525

30 W Digital TV Amplifier with Integrated ADC

Cirrus Logic 

Software Mode System Features

! Digital Audio Processing

– 3 Programmable Parametric EQ Filters for

Channels 1 and 2

– 2 Programmable Parametric EQ Filters for

Channel 3

– 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 for 32 kHz, 44.1 kHz, 48 kHz

! 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

! 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

CS4525

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 and the package is thermal-

ly 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, over-temperature

protection and error reporting as well as a thermal warn-

ing 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 Cus-

tomer Reference Design is also available.

Please refer to “Ordering Information” on page 90 for

complete ordering information.

2DS726A1

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