CX20805

High-Performance Low-Power Digital Audio Signal Processor

Applications

Unified Communication Peripherals

Telepresence/Unified Communication

Device

All-in-One Speakers/Docking System

LCD Display/Sound Bar

Home Automation/Intercom

Wi-Fi® Phone/Smart Phone Docking

Systems

Mobile Internet Devices, Portable

Navigation Devices, Portable Media

Players

Multimedia IP phone

Embedded applications

Full-duplex Hands-free Telephony

A/V receivers, DVD

Receivers, Set-top Box

After-market Automotive Amplifiers

and Entertainment systems

Bundled DSP Algorithms

(Royalty Free)

Fast Fourier Transforms (FFT)

Finite Impulse Response (FIR) filters

Infinite Impulse Response (IIR) filters

128 band Analysis and Synthesis

Filterbanks

Dual Knee Dynamic Range

Compression (DRC)

Automatic Gain Control (AGC)

Sampling Rate Converter (SRC &

ASRC)

Equalizer (EQ) with flexible number of

bands

Downmixer (Flexible number of

channels)

Amplifier and Mixer (Side Tone

Generation)

Signal generator

Cyclical Buffering Mechanisms

Part Number CX20805

Description High-Performance Low-

Power Digital Audio Signal Processor

Audio

Audio/Voice DSP

cores are often rated at the typical conditions with overvoltage and no margin. Under these

conditions, CX20805 could easily exceed 1000 MIPS.

The CX20805 is a 32-bit dual core Digital

Signal Processor (DSP), designed using

Conexant Audio Processing Engine

(CAPE) cores. The CX20805 audio

processor offers customers

programmability and flexibility in their

designs by providing a cost- effective

architecture which needs high

performance and low power. CX20805 is

the first high performance, low-power

audio DSP in the audio market that offers

computationally intensive audio

processing algorithms with large on-chip

memory 520KB SRAM/352KB ROM and

capable of supporting all major high

sampling rates through various audio

interfaces to external SoCs and Analog

Mixed Signal chipsets.

The device features support for up to four

digital microphone inputs, support for dual

and receive with independent sampling

rates, and a range of digital input/output

channel selections for flexible routing and

mixing. Different audio sampling rates

ranging from 8 kHz to 96 kHz are

generated directly from the master clock

without the need for external PLL. The

device can be controlled and configured

by both read and write capability through

The USB interface supports both High

speed and Full speed, and is USB2.0

Audio Class compliant for both data and

control. An integrated on-chip 128-bit

AES decoding engine is present for

copyright protection and rendering full-

rate, lossless Blu-ray media content.

There are six timers/counters on chip

which can be used for different

application based requirements.

The device also has a Conexant Audio

Bus (CAB) interface which has been

specially developed to handle high data

rate transfer when interfacing with HD

Audioor external analog codecs. There

are two on-chip tri-color PWM LEDs and

a PIC controller which is retaskable to

support various communication protocols

over 24 programmable GPIOs.

The device integrates advanced low-

power techniques, such as DC-DC

converters, Power Gating, Power

Retention, Low-Vdd Standby, Dynamic

Voltage Scaling (DVS) and Adaptive

Voltage Scaling (AVS), which employ

voltage control to manage power. In

addition, frequency scaling mechanisms

can also be used to reduce the power

consumption further.

CX20805 comes bundled with advanced

signal processing routines, free of

royalties, for customers interested in

developing their own proprietary

algorithms for different applications. This

package includes CAPE optimized

implementations of filter banks,

Equalizers, Sampling Rate Converter

(SRC), a small footprint Operating

System (etc.).

The Configuration Toolbox allows for fast

configuration of the various signal

processing algorithms and performance

optimization. A complete evaluation kit

with reference board and all the

necessary technical documentation and

software is available. An efficient C

compiler is also available for customers

interested in programming the CAPE

Cores.

Samples are available in a small footprint

9x9, 116-pin Dual Row QFN packaging

along with Evaluation kits.