ZL38003GMG Datasheet ZL38003GMG, ZL38003GMG2 | P1-P3

Zarlink Semiconductor Inc.

Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.

Zarlink has introduced a new generation family of

AEC (ZL38002 and ZL38004). Zarlink recommends

these products for new designs.

A full Design Manual is available to qualified

customers. To register, please send an email to

VoiceProcessing@Zarlink.com.

Features

• Handles up to -6 dB acoustic echo return loss

• 127 ms acoustic echo canceller

• Provides up to 12 dB of Noise Reduction

• Operate in two modes, Dual Analog mode and

single Analog mode (other port is digital PCM)

• PCM Data Formats in single Port mode- 16-bit

Linear, companded ITU-T A-law or U-law

• Advanced NLP design - full duplex speech with

no switched loss on audio paths

• Tracks changing echo environment quickly

• Adaptation algorithm converges even during

Double-Talk

• Designed for performance in high background

noise environments

• Provides protection against narrow-band signal

divergence

• Howling prevention eliminates uncontrolled

oscillation in high loop gain conditions

• AGC on speaker path

• Transparent data transfer and mute options

• Boot loadable for future factory software upgrades

• Serial micro-controller interface

• Two 16 bit linear ACD and DAC that meet ITU-T

G.711/712 recommendations

• Four Audio TX/RX Interfaces

• Differential Microphone Inputs

• Programmable Bias Voltage Output for Electret

microphones

• Microphone Presence Detection, Microphone

Mute

May 2007

Ordering Information

ZL38003GMG 81 Ball CBGA Trays, Bake & Drypack

ZL38003GMG2 81 Ball CBGA**Trays, Bake & Drypack

**Pb Free Tin/Silver/Copper

-40°C to +85°C

ZL38003

AEC with Noise Reduction & Codecs for

Digital Hands-Free Communication

Data Sheet

Figure 1 - Block Diagram

Serial

Microport

Interface

G.712

Codec

Crosspoint

G.712

Codec

AEC

Audio Interface

AUXTONE

EAR

MIC

BIAS

MICDET

RESETB

EAR

MIC

BIAS

MICDET

EAR

MIC

EAR/SPEAKER

MIC

BIAS

MCLK

FPi

C4i

Rin

Sout

Sin/Rin

Rout/Sout

SCLK

CS_CODEC

CS_AEC

DATA1

DATA2

PCM

Timing

ZL38003 Data Sheet

Zarlink Semiconductor Inc.

• Multiple Gain pad settings

• Adjustable gain pads from -24 dB to +21 dB at Xin, Sin and Sout to compensate for different system

requirements

• Programmable Microphone Gain (0dB to +46.5 dB in 1.5 dB Steps)

• Side tone Mute, Programmable Side tone Gain (-39 dB to +6 dB in 3 dB Steps)

• User gain control provided for speaker path (-24 dB to +21 dB in 3 dB steps)

• Programmable Earpiece Gain (-28 dB to +2 dB in 2 dB Steps)

• RX Channel Mute, Programmable RX Volume control (-21 dB to 0 dB in 3 dB Steps)

• Differential Earpiece Driver Outputs (66 mW rms into 32 Ohms, 150 mW rms into 16 Ohms)

• Cross-Point Connects PCM Channels to any of the Four Audio TX/RX Interfaces

Applications

• Hands-free car kits

• Full duplex speaker-phone for digital telephone

• Echo cancellation for video conferences

• Intercom Systems

• Security Systems

1.0 Functional Description

The ZL38003 is an Acoustic Echo Canceller (AEC) with dual codec as shown in Figure 2. The ZL38003 provides

127 ms of acoustic echo cancellation, which makes it ideal for hand free car kits, and speaker phones designs.

Each of the codecs in the dual codec can be connected to 1 of 4 four analog ports through a cross point switch.

Also, the network side can be routed to a digital PCM interface that input/outputs either linear 2's complement or

A-/mu law commanded PCM data.

MT93L16 ZL38001 ZL38002 ZL38003

Description AEC for analog hands-

free communication

AEC for analog hands-

free communication

AEC with noise reduction for digital

hands-free communication

AEC with noise reduction & codecs

for digital hands-free communication

Application Analog Desktop phone

Analog Intercom

Analog Desktop phone

Analog Intercom

Hands-free Car Kits

Digital Desktop Phone Home Security

Intercom & Pedestals

Hands-free Car Kits

Digital Desktop Phone Home Security

Intercom & Pedestals

Features

AEC 1 channel 1 channel 1 channel 1 channel

LEC 1 channel 1 channel Custom Load Custom Load

Gains User Gain User Gain/18 dB

Gain on Sout

User Gain + System tuning gains User Gain + System tuning gains

Noise

Reduction

NN Y Y

Integrated

Codecs

N N N dual channel

Table 1 - Acoustic Echo Cancellation Family

ZL38003 Data Sheet

Zarlink Semiconductor Inc.

2.0 Acoustic Echo Canceller (AEC) Description

The AEC section is comprised of an acoustic echo canceller, noise reduction and the operational control functions

for operation. The AEC guarantees clear signal transmission in both transmit and receive audio path directions

ensuring reliable voice communication even when low level signals are provided. The AEC does not use variable

attenuators during double-talk or single-talk periods of speech, as do many other acoustic echo cancellers for

speakerphones. Instead, the AEC provides high performance full-duplex operation similar to network echo

cancellers. This results in users experiencing clear speech and uninterrupted background signals during the

conversation and prevents subjective sound quality problems associated with “noise gating” or “noise contrasting”.

The AEC uses an advanced adaptive filter algorithm that is double-talk stable, allowing convergence even while

both parties are talking. This algorithm continually tracks changes in the echo path, regardless of double-talk, as

long as a reference signal is available for the echo canceller.

The echo tail cancellation capability of the acoustic echo canceller has been sized appropriately (127 ms) to cancel

echo in an average sized office or large size car with a reverberation time of less than 127 ms.

Figure 2 - AEC Block Diagram

Rout

Sin

Micro

Interface

Program

RAM

Program

ROM

Howling

Controller

NBSD

Linear/

µ/A-Law

Linear/

µ/A-Law

Filter

Linear

µ/A-Law/

Adaptive

Filter

Sout

Rin

AGC

User

Gain

-24 -> +21dB

ADV

NLP

Linear

µ/A-Law/

UNIT

CONTROL

Detector

Talk

Double

NBSD

Limiter

ACOUSTIC ECHO PATH

Gain

Pad

Gain

Pad

Gain

Pad

Noise

Reduction

P1-P3 P4-P6 P7-P7

ZL38003GMG

Mfr. #:

Buy ZL38003GMG

Manufacturer:

Microchip / Microsemi

Description:

IC ECHO CANCEL DUAL CODEC 81CBGA

Lifecycle:

New from this manufacturer.

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ZL38003GMG

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