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Yamaha to release the Digital Amplifier LSI “YDA136”
– With an output power of between 60 to 150W, a control LSI for digital amplifiers that realizes a low distortion rate and low amount of residual noise due to Yamaha’s original feedback circuit technology –
– Contains audio functions necessary for home theater digital amplifiers –
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Yamaha Digital Amplifier LSI “YDA136”
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Yamaha Corporation (Head office: Nakazawa-cho 10-1, Hamamatsu-shi, Shizuoka; President: Shuji Ito) will begin sample shipments on January 30, 2004 of its Digital Amplifier LSI “YDA136” as a digital amplifier1 control LSI for home theater.
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Sample price and launch of sales
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| Product name |
Code# |
Sample price |
Shipment date
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| Yamaha Digital Amplifier LSI |
YDA136 |
1,000 yen |
January 30, 2004
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Initial sales planned: 100,000 units/month
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| Product outline |
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The “YDA136”, which will be shipped soon, is an LSI that contains audio circuitry necessary for the construction of digital amplifier systems for home theater. It is a product that features, on one chip, an input interface circuit for digital and analog audio signals, a digital volume circuit, a digital pulse modulation2 circuit, a pre-driver circuit for power MOS FET3, a pulse feedback circuit4, and a multi-channel data interface circuit.
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Product development background
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Since becoming the first domestic semiconductor manufacturer to introduce a digital amplifier LSI with 2.5W/2-channel output by launching the Digital Amplifier LSI “YDA131” in October 2001, Yamaha has put out a rich lineup of digital amplifier LSIs. The “YDA136”, which has been developed this time, is an LSI that has been developed to be used for home theater multi-channel digital amplifier systems that have an output of between 60 to 150W per channel.
The digital amplifier has better operating efficiency, lower power electricity, and lower heat emission than current analog amplifiers. It enables greater compactness, lowers power consumption, and improves sound quality. In addition, reduced heat sink and radiation space, and the elimination of air-cooling fans allows greater freedom for designing the equipment’s exterior, enabling unprecedented new designs for audio equipment.
Recently, consumers have been especially demanding home theater AV amplifiers that have more than 5.1 channels and a large output power from between several tens to several hundred watts per channel. As a result, home theater multi-channel digital amplifiers that take advantage of their digital qualities, are thin, and have low power consumption are being launched.
Also, because the new “YDA136” was developed for home theater multi-channel amplifiers, they may even be used in AV receivers and AV amplifiers with built-in DVD players.
Although digital amplifiers are generally outstanding in that they are thin sized, and have low power consumption, there was the problem that their construction costs became too high as a result of the difficulty in constructing a circuit for the power supply as well as securing a good sound quality due to the distortion rate and amount of residual noise caused by fluctuation of the power supply voltage.
Because the “YDA136” features Yamaha’s original pulse width modulation system and pulse feedback circuit, a simple circuit construction has been realized and the distortion rate and amount of residual noise has been greatly improved.
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| Main features |
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| 1. |
System LSI that contains, on one small chip, audio functions to construct a digital amplifier
The chip, which is a square-sized, small 14mm x 14mm 100SQFP package, features 24-bit digital audio signal input, analog audio signal input, 2-channel digital volume, 2-channel pulse modulation, pre-drivers for power MOS FET, and a pulse feedback circuit.
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Possible to construct a digital amplifier system with BLT output5 of 60W to 100W per channel at 6 ohms and 100W to 150W per channel at 4 ohms
By connecting the power MOS FET to the built-in power MOS pre-drivers in the YDA136, it is possible to construct a digital power amplifier with an output of between 60 to 100W per channel at 6 ohms and between 100 and 150W per channel at 4 ohms.
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Yamaha’s original pulse modulation system and pulse feedback circuit
Because Yamaha’s original pulse modulation system and pulse feedback circuit makes it possible to reduce sound degradation caused by fluctuation of power supply voltage, the new digital amplifier has a greatly lowered distortion rate and amount of residual noise compared to existing digital amplifiers. The new digital amplifier LSI even supports simple and unstable transformer-type low cost power supplies.
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Multi channel data interface
Features a multi-channel data interface that can be used to connect multiple “YDA136” LSIs and construct multi-channel systems. The CPU interface makes it possible to control the digital volumes that are contained in the “YDA136” (6dB to -73dB per 1dB step) independently on each channel.
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Master / slave clock operation due to an external oscillator circuits6.
When connecting to multiple “YDA136” LSIs to construct multi-channel systems, it is possible to operate the “YDA136” LSIs at the same time by using the master / slave clock mode.
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Over-current protection circuit and an over-heating protection circuit
Features a circuit that detects excessive current of power MOS FET output that is connected to an “YDA136” and protects against shorts at each end of the speaker cables, and a circuit that protects against internal over-heating.
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| Notes |
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| 1. |
Digital amplifier
Audio analog amplifiers use an analog voltage wave equivalent in size to the music signals and amplify them electronically in the same waveform for delivery to speakers. In contrast, digital amplifiers first transform musical signals by size into high-speed digital signals. After amplification with powerful electric digital pulse signals, the speakers pick up only the musical signals. Digital signals can be transformed in several ways. Since digital amplifiers amplify power with on/off digital signals only, power efficiency is much higher than for analog amplifiers. Digital amplification makes much more efficient use of power than analog does, consuming less energy and emitting less heat for greater power output.
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| 2. |
Digital Pulse modulation circuit
The circuits lengthen and shorten the widths of digital pulses, amplifying the voltage of sound signals. Also known as a PWM modulation circuit.
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Pre-driver circuits for power MOS FET
Power MOS FET (a metal oxide semi conductor field effect transistor for power output), it is widely used for on/ off high voltage. The pre-driver circuit is a circuit for driving the power MOS FET’s gate switching signal.
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Pulse feedback circuit
A circuit that that carries out the amplifier’s gain control by returning the PWM signal, which is the digital amplifier’s output, to input.
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BTL output
Bridge-Tied Load outputs are digital signal output circuits carrying loads with positive and negative polarities.
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External Oscillator circuits
Timing clock generator circuits operate by using the external clock inputs.
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Company names and product names inside this document are either trademarks or registered trademarks of Yamaha
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Enquiries: Yamaha Corporation
Enquiries from the media:
PR Division Corporate Communication Group
Misao Tanaka
Takanawa 2-17-11, Minato-ku,
Tokyo 108-8568, Japan
TEL: (03) 5488 6601
Enquiries from consumers:
Semi-Conductor Group Marketing Division Product and Planning Section
Hiromi Ozeki, Toshihiko Muramatsu
Matsunokijima 203, Toyooka-mura
Iwata-gun, Shizuoka 438-0192,Japan
TEL: (0539) 62 5444
<Please check to find your nearest Yamaha LSI dealer or sales office>
http://www.yamaha.co.jp/product/lsi/reference/index.html
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