Zarlink has introduced a new generation family of AEC (ZL38002 and ZL38004). Zarlink recommends these products for new designs. The MT93L16 device contains two echo cancellers, as well as the many control functions necessary to operate the echo cancellers. One canceller is for acoustic speaker to microphone echo, and one for line echo cancellation. The MT93L16 provides clear signal transmission in both audio path directions to ensure reliable voice communication, even with low level signals. The MT93L16 does not use variable attenuators during double-talk or single-talk periods of speech, as do many other acoustic echo cancellers for speaker-phones. Instead, the MT93L16 provides high performance full-duplex operation similar to network echo cancellers, so that users experience clear speech and un-interrupted background signals during the conversation. This prevents subjective sound quality problems associated with 'noise gating' or 'noise contrasting'.

Features & Benefits

• Contains two echo cancellers: 112 ms acoustic echo canceller + 16 ms line echo canceller
• Works with low cost voice codec. ITU-T G.711 or signed mag µ/A-Law, or linear 2's comp
• 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
• Provides protection against narrow-band signal divergence
• Howling prevention stops uncontrolled oscillation in high loop gain conditions
• Offset nulling of all PCM channels
• Serial micro-controller interface
• ST-BUS, GCI, or variable-rate SSI PCM interfaces
• Handles up to 0 dB acoustic echo return loss and 0dB line ERL
• 20 MHz master clock operation
• Low power mode during PCM Bypass
• 2.7 V to 3.6 V supply voltage; 5 V-tolerant inputs

Documentation

• mt93l16-datasheet-oct2006.pdf

Design Manuals

Software Manuals

Application Notes

• ZLAN-55 - Improving Convergence Speed (MT93L16)

Typical Applications

• Full duplex speaker-phone for digital telephone
• Echo cancellation for video conferencing
• Handsfree in automobile environment
• Full duplex speaker-phone for PC

Product Packaging & Availability

Part Number	Package Type	Pin Count	Lead-Free Option	Shipping Option(s)	Lead Time(wks)	Status
MT93L16AQ1	SSOP	36	Pb-free-Matte Tin	Tubes (Anti-static Sticks)	8-10 weeks	Production
MT93L16AQ1	SSOP	36	Pb-free-Matte Tin	Tubes (Anti-static Sticks)	8-10 weeks	Production

Packaging Information

• Soldering Profiles
• Moisture Sensitivity
• Shelf Life
• Reliability Data

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