Products > Integrated Circuits (ICs) > Interface ICs > ZL38002QDG1
ZL38002QDG1 TQFP48
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Low-Voltage Acoustic Echo Canceller With Noise Reduction

Manufacturer :
Microchip Technology, Inc
Package/Case :
Product Categories :
Interface ICs
RoHs Status:
Lead free / RoHS Compliant

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ZL38002QDG1 Product Details

The ZL38002QDG1 device is comprised of an acoustic echo canceller and the necessary control functions for operation. The ZL38002QDG1 guarantees clear signal transmission in both transmit and receive audio path directions to ensure reliable voice communication, even when low level signals are provided. The ZL38002QDG1 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 ZL38002QDG1 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 ZL38002QDG1 uses an advanced adaptive filter algorithm that is double-talk stable, which means that convergence takes place even while both parties are talking. This algorithm allows continual tracking of 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 (112 ms) to cancel echo in an average sized office with a reverberation time of less than 112 ms.Simplified Block DiagramTypical ApplicationsHands free car kitsFull duplex speaker-phone for digital telephoneEcho cancellation for video conferencingSecurity systemsIntercom systems (door entry, elevator, and restaurant drive-through)


  • 112 ms acoustic echo canceller
  • Up to 12 dB of noise reduction
  • Works with low cost voice codec. ITU-T G.711 or signed mag µ/A-Law, or linear 2's compliment
  • Advanced NLP design - full duplex speech with no switched loss on audio paths
  • Fast re-convergence time: tracks changing echo environment quickly
  • Adaptation algorithm converges even during Double-Talk
  • Designed for exceptional performance in high background noise environments
  • Howling prevention stops uncontrolled oscillation in high loop gain conditions
  • User gain control provided for speaker path (-24 dB to +21 dB in 3 dB steps)
  • Adjustable gain pads from -24 dB to +21 dB at Xin, Sin and Sout to compensate for different system requirements
  • AGC on speaker path
  • Handles up to -6 dB acoustic echo return loss (with the appropriate gain pad settings)
  • Idle channel noise suppression
  • Each port may operate independently in companded format or linear format
  • Bootloadable for future factory software upgrades


  • Hands free car kits
  • Full duplex speaker-phone for digital telephone
  • Echo cancellation for video conferencing
  • Security systems
  • Intercom systems (door entry, elevator, and restaurant drive-through)

ZL38002QDG1 Block Diagram
(Picture: Diagram)

Technical Parameters

Function Echo Cancellation Power (Watts) 90mW
Interface Serial Operating Temperature -40??C ~ 85??C
Number of Circuits 1 Mounting Type Surface Mount
Voltage Supply 2.7V ~ 3.6V Package / Case 48-TQFP
Current Supply 20mA Supplier Device Package 48-TQFP (7x7)

ZL38002QDG1 Documents

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Estimated Delivery Time: Dec 03 - Dec 08 days (choose Expedited at checkout).

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    90 days quality guarantee for all products.


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1.We provide 90 days warranty.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


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Microchip Technology Inc. is a leading manufacturer of microcontroller and analog products, providing low-risk product development, lower total system cost, and faster time to market for thousands of...
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