CX20562 Interface Diagram

Boost

AD C

D AC

Volum e

C lass-AB

D SP

M em ory

D M A

OT P

U SB

Interface

C haracter

LC D

AD C

Volum e

20-Button

Keypad

H eadphone

Speakers

Auxiliary Line

In

M icrophone

Analog Volum e

Potentiom eter

C rystal

R OM

Controller

Class-D

4-Button

Keypad

Audio

Speakers-on-a-Chip

Conexant’s portfolio includes a comprehensive suite of semiconductor

solutions for communications and consumer applications.

Distinguishing Features

• Wideband Acoustic Echo Cancellation DSP

engine exceeding TIA 920 requirement

• Integrated 1.2 W Class-D amplifier, higher

output reference design available

• 24-bit DAC/ 16-bit ADC

• USB 2.0 full speed compliant

• Auxiliary line in input with jack sense

• Music-On-Hold

• Aux Fade-in/ Fade-out

• DSP Array Microphone

• BrightSound

• USB bus powered or external powered

option

A complete evaluation kit including the reference

board and all necessary technical documents and

software is available

Part Number CX20562

Description

USB Speakers-on-a-Chip with

Hardware Acoustic Echo

Cancellation DSP

USB Speakers-on-a-Chip with Hardware

Acoustic Echo Cancellation DSP

CX20562

Conexant’s CX20562 is the world’s first family of “Speakers-on-a-Chip” (SPoC)

solutions that integrates the functionality of a digital audio/voice processor,

audio codec, and Class-D amplifier in one cost-effective 48-pin Quad Flat-No

Lead (QFN) package. This solution is optimized with stereo, high fidelity 24-bit

DAC for music rendering. It also features a built-in echo-free speakerphone

with wideband Acoustic Echo Cancellation (AEC) and a noise-reduction

hardware Digital Signal Processor (DSP). The high-quality music speaker and

voice speakerphone combination is made possible with the latest advances

in all-CMOS mixed-signal and DSP integration. The turnkey solution enables

manufacturers to quickly design cost-effective convergence products for high

definition audio and voice applications.

Key innovations inlclude BrightSound™, a Conexant proprietary sound

processing algorithm that dramatically improves audio quality and reduces

speaker clipping. In Night Mode, the background sound signal quality is

maintained, while allowing the user to clearly hear the vocal audio when

watching a movie or playing a video game without increasing the volume.

The CX20562 also supports many consumer-oriented features such as Music

on-hold, Aux fade-in/ fade-out, DSP Array Microphones, Global System for

Mobile Communications (GSM) noise immunity, and Instant Messaging (IM)

“hotkey” launch button.

The CX20562 has one USB interface that allows manufacturers to develop plug-

and-play products that are PC and Mac compatible and one auxiliary analog

input for connection with other audio peripherals. The device supports both

digital and analog volume control, microphone mute, and speaker mute. The

CX20562 features additional interface to 20 keys programmable keypad and

LCD display interface. The built-in Class-D amplifier is capable of driving 1.2

W on 4 ohm load via USB host power, it can also be used as the pre-amp for

larger powered speakers output. The efficiency of Class-D amplifier makes it

ideal for portable audio application.

Conexant’s SPoC solution provides the technology platform to make the

convergence of audio entertainment and voice communication a reality.