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Yamaha Announced to Begin Sample Shipments of New Digital IC Amplifiers for Flat-Panel TVs
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Yamaha Corporation(TSE 1ST Section 7951) (Head office: 10-1, Nakazawa-cho, Naka-ku, Hamamatsu, Shizuoka; President: Shuji Ito) has developed and will soon begin to ship samples of the world’s first digital IC amplifiers*1 containing a analog-type DRC*2 and power limiter*3 for use in flat-panel TVs. Yamaha has developed three models, the YDA 146, 147, and 148, to cover the range of flat-panel TVs from large to small sizes. (The sample prices are ¥735 for YDA 146, ¥630 for the YDA 147, and ¥525 for YDA 148.) Shipments of samples of these units will begin on April 16, 2007.
The recently developed YDA 146, 147, and 148, samples of which will soon be made available, cover the stereo power output range from 30 watts to 5 watts. These units are optimal digital IC amplifiers for a wide range of flat-panel TVs, from the largest sizes down to the 15-inch class. Specifications these three amplifiers have in common include a DRC (dynamic range compression unit), which makes listening to high-quality digital broadcasts substantially easier; a power limiter that allows setting of the maximum output level to match the capacity of the speakers in the TV set; and circuitry that minimizes the affect of fluctuation in the electric power voltage. Also, by designing the mounted package to be similar across the three models, Yamaha has made it possible to install them in a wide range of TV models.
Yutaro Nakano, Division Manager of the LSI Sales and Marketing Division, has this to say about the new IC amplifiers. “These three IC amplifiers draw on the technology that allowed Yamaha to become the first semiconductor manufacturer in Japan to develop a 2.5 watt stereo digital IC amplifier in 2001. The YDA 146, 147, and 148 digital IC amplifiers feature a small footprint, low heat emission, and high-quality sound reproduction. We anticipate demand for these units for use in LCD TVs and plasma TVs will be strong.
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| Main Specifications |
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| System |
Digital amplifier with analog differential input, pulse width modulation (PWM) system, and bridge-tied load (BTL) output |
| Absolute maximum power source voltage |
20V |
| Recommended operating voltage range |
8V to 16.5V |
| Maximum output |
- YDA 146: 30W x two channels/4
- YDA 147: 20W x two channels/4
- YDA 148: 15W x two channels/8
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| Distortion + noise |
0.01% at 1kHz, 8 |
| Residual noise |
48 V |
| Signal-to-noise ratio |
105dB |
| Packages |
YDA 146 and YDA 147: 48SQFP
YDA 148: 32QFN |
| Usable temperature range |
-40 to +85 |
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| Notes |
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*1: Digital IC amplifier: Also known as a Class-D amplifier. Compared with analog amplifiers classified as regular Class-AB amplifiers, digital amplifiers radiate less heat and are more efficient. With regular Class-AB amplifiers, the difference between the power source electricity and the power output to the speakers is consumed inside the amplifier, thus radiating heat inside the amplifier unit. However, with Class-D amplifiers, the internal power loss is reduced through a switching operation, thus reducing the amount of heat generated.
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*2: Dynamic range compression (DRC): The form of the signal that is input is restrained/altered through a function that increases the volume of weak sounds louder and lowers the volume of loud sounds.
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| *3: Power limiter: A function that allows users to limit the maximum output level at will. With conventional amplifiers, the maximum output is determined by the voltage and the impedance of the speakers. When less durable speakers are used, it is necessary, in some cases, to limit the output of the amplifier to prevent damage to the speakers. |
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