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Hottest devices, technologies debut at 13th IIC-China

Posted: 27 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Class D amplifier? IIC-China? test solution? 3G? mobile WiMAX?

Semiconductor manufacturers will again gather at the 13th International IC-China Conference and Exhibition (IIC-China) when the event kicks off Feb. 28 at the Chengdu New International Exhibition and Convention Center.

Set to make a statement in this year's event are Class D amplifiers, which are projected to edge out Class AB amps with their lower prices and improving audio quality. Gartner Inc. forecasts that sales of Class D amplifiers will increase to $688 million in 2011 from $334 million in 2006.

Amp rollouts
Maxim Integrated Products will display its MAX9775 and MAX9776 Class D audio systems that can provide 3D stereo promoting function. The devices target cellphones and other application designs with higher demand for audio quality. With MAX9775's internal Maxim 3D stereo enhancement, stereo sound effect can be simulated even when the loudspeaker is very close. In addition, the both Class D audio systems fix special spread spectrum modulation and 3G AEL technology. The special structure lowers down EMI radiation to make sure the system meets requirement from international communication standard.

Meanwhile, Analog Devices Inc. will showcase its ADAV4101, ADAV4312 and ADAV4322 audio processors that contain embedded processing for small-sized loudspeaker in modern ultrathin flat panel, LCD and plasma TVs. ADI's digital audio enhancement devices feature audio signal digital processing function accompanied with ADC along with high-performance, multipassage 24bit ADC and DAC that can receive analog input signals from DVD/VCR player and STB.

International Rectifier will present the IRAUDAMP4 Class D audio power amp that complements its 200V digital audio driving IC IRS20955 and DirectFET's digital audio MOSFET IRF6645 to become a two-passage, 120W half-bridge design. The device claims to achieve 96 percent efficiency under 120W and 4?. The design combines key protection functions including overcurrent protection, overvoltage protection, undervoltage protection, direct current protection and overheat protection. Moreover, compared with typical circuit design, IR claims the device's reference design can help designers save 50 percent PCB, making it suitable for home theater, professional amplifier, musical instrument and automotive entertainment systems.

Tai-1 Microelectronics, on the other hand, claims to offer a complete Class D amplifier product line. The TMPA208 and TMPA268 use direct current voltage or pulse width modulator to control sound volume and can be controlled through a processor or press keys. Class D TMPA268DS amplifier provides frequency hopping function allowing AM2 and FM pins to select signal frequency, spread spectrum, hopping frequency and wide-interval frequency hopping. For specific use, frequency hopping fits AM and SW while spread spectrum and wide-interval frequency is used to reduce FM disturbance and EMI.

Product debuts
Princeton Technology Corp. will launch at this year's IIC-China the PT2333 digital power amplifier with low power consumption designed for cellphones. The device achieves 2.5W with 85 percent efficiency at 5V and 4? impedance output. PT2333 also saves the design of output filter for clients and retrench external circuit to meet the space requirements of handsets.

The latest non-wave filter Class D amplifier produced by Power Analog Microelectronics Inc. promises to decrease chip area and lower down EMI disturbance. The PAM8803 offers an integrated digital volume controller, which can use two press keys "lifting" (red) and "lowering" (black) for control. The digital volume controller also decreases need for external ICs therefore lowering the cost of the whole machine.

STMicroelectronics will also launch the TS4997 power amplifier chip for handsets and portable music players. The claims to provide 3D sound effect on stereo loudspeaker and increase impact force and round sound effect on MP3 and video files. At 5V power supply, the successive average output power of TS4997 in every channel is 1.2W.

Entering the home theater and audio system markets, Texas Instruments Inc. will display the TAS5342 and TAS5352 digital amplifiers. TAS5352 can drive two channels through 100W while TAS5342 can offer each channel 125W driving capacity through 10 percent total harmonic distortion and noise at 4? load. With a 98dB SNR, the devices meet the consumers' demand for high audio performance.

Test arena
Not to be left behind by the hottest technologies and device innovations, testing device manufacturer are set to show off their latest offerings. Top test companies Tektronix Inc., Agilent Technologies Inc. and Rohde & Schwarz will exhibit oscillographs, audio/video and handheld test instruments.

Rigol Technologies Inc. will showcase the VS5000 series of virtual digital oscillograph with 400MSps real time sampling rate, 50GSps equivalent sampling rate. The series has a memory depth of up to 1M sampling point and can offer wide bandwidth ranging from 40MHz to 200MHz. Meanwhile, Shenzhen Kaizhitong Microelectronics Technology Co. Ltd will display an instrument designed for IC test seat and BGA one station rework service.

Eye on WiMAX
With the International Telecommunications Union's recognition of WiMAX as a 3G standard in 2007, test tycoons had their eyes set on test schemes targeting the next-generation wireless technology.

Tektronix will exhibit two mobile WiMAX specialized test solutions, one for functional test and WIMAX infrastructure simulation, and the other for supervision. The functional test based on the G35-WiMAX solutions; and the supervision type is based on Tektronix NSA platform that includes debugging and performance analysis.

R&S' CMW270 solution used in WiMAX terminal production features high concrete test speed, promising maximum output of WiMAX chip. In addition, the CMW270 covers 100MHz to 6GHz frequency. Also, proving a second wave of testing support are Agilent's 89601A vector signal analysis and N7615B signal studio mobile WiMAX testing instrument solutions.




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