products > product profiles > ZL38002
ZL38002 Digital Echo Canceller for Hands-Free Communication
| Product Status - Production |
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The ZL38002 device is comprised of an acoustic echo canceller and the necessary control functions for operation. The ZL38002 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 ZL38002 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 ZL38002 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 ZL38002 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.
Features
- 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 m/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
Typical Applications
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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)
Product Information
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Product Availability and Packaging
| Ordering Part No. |
Package Type |
No. of Pins |
Lead-free Option |
Shipping Option |
Lead Time (Weeks) |
Status |
 |
| ZL38002QDG |
TQFP |
48 |
|
Trays. Bake & Drypack |
26 Week(s) |
Production |
| ZL38002DGF1 |
SSOP |
36 |
Pb-free-Matte Tin |
Tape & Reel. Bake & Drypack |
CONTACT ZARLINK |
Production |
| ZL38002DGE1 |
SSOP |
36 |
Pb-free-Matte Tin |
Tubes. Bake & Drypack |
8 Week(s) |
Production |
| ZL38002QDG1 |
TQFP |
48 |
Pb-free-Matte Tin |
Trays. Bake & Drypack |
6-8 weeks |
Production |
Product Lead-Times when quoted are not guaranteed and are provided as a
general guideline only; they may be varied from time to time without
notice. Updated estimates or actual schedule commit dates will be provided
at the time of order placement with Zarlink or its distributor.
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Related Products
| Part Number | Description |
|
 MT91L60 |
3 V Multi-Featured Phone CODEC with Programmable u/A Law Companding |
| MT91L61 |
3 V Multi-Featured Phone CODEC with Programmable u/A Law Companding |
| MT91L62 |
3 V Single Rail Multi-Featured Phone CODEC with Programmable u/A Law Companding and Reference Voltage and Bias Source |
| MT93L16 |
Low-Voltage Acoustic Echo Canceller |
| ZL38001 |
AEC for Analog Hands-Free Communication |
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Product Positioning
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ZL38002 Digital Echo Canceller for Hands-Free Communication
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