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Codec integrates discrete analog front-end

Posted: 07 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:codec? analog front-end? AFE? transistor?

Nuvoton Technology Corp. expands its Pro-X (Programmable Extended CODEC/SLCC) series devices with the introduction of the N681622 subscriber line control circuit (SLCC).

Supporting Foreign eXchange Station (FXS) ports, the N681522 operates seamlessly with Nuvoton's single- and dual-channel Pro-X CODEC/SLCC devices, the N681386 for narrowband (8kHz) operation and N681387 for wideband (16kHz) operation, as well as the dual-channel the N682386 (narrowband) and N682387 (wideband).

In the past, these four devices required an external analog front-end (AFE) consisting of discrete devices. The N681622 now integrates all the AFE transistors needed for a single-channel FXS into one low-cost package. The resulting chipsets can be implemented in a variety of FXS solutions: single- and dual-channel, narrowband and wideband. The N681386 and N681622, for example, can be used to implement a single narrowband FXS solution, while the N682387 and two N681622s can be designed into dual-wideband FXS solutions.

By integrating discrete AFE components, the N681622 reduces total component count of a design up to 30 percent which yields corresponding inventory savings for manufacturers and reliability improvements for end users. Additionally, the board space used by AFE devices can be reduced by more than half, making far more compact solutions possible. Furthermore, the N681622's AFE implementation reduces the designs' power consumption in all states, including over 20 percent improvement in the On-Hook state.

The N681622 extends the Nuvoton Pro-X architecture's objective of distributing temperature gains evenly across the circuit design, ensuring that no "hot spots" develop within end-user systems. By keeping each subscriber line feed circuit (SLFC) channel in separate packages with individual heat sinks, Nuvoton provides engineers with more options to control temperatureeven in the most challenging environments.

"The N681622 builds on Nuvoton's unique, widely deployed Pro-X architecture with a more highly integrated, complementary CODEC/SLCC that dramatically reduces power consumption, component count and board space in a wide range of FXS applications," said Saleel Awsare, president, Nuvoton America.

The Pro-X family's CODEC/SLCC and SFLC combination enables a low typical Idle Channel Noiseas low as 3dBRNCand typical return loss of 40dB. These features directly translate into high Voice Quality Test scores for end-user systems.

The N681622 is available in a QFN-20 package, with prices beginning at $0.35 in volumes of 10,000. Evaluation boards of the single and dual chipsets are available now. Performance test reports along with low-level device drivers for rapid prototyping and easy migration can be obtained from Nuvoton.

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