The world's well-known semiconductor manufacturer ROHM is oriented to all sound quality audio devices, such as Hi-Fi (high fidelity) sound *2 suitable for playing high-resolution sound source *1), and develops a IC "BD372xx series" (BD37201NUX / BD37210MUV / BD37215MUV) for audio devices that are powered by the audio devices carried in the device.
"BD372xx series" is the world's first soprano audio power IC, the integration of ROHM years of accumulation of power IC analog design technology and original sound quality design technology improved. The product adopts the newly upgraded high speed response error magnifying circuit and low noise structure, and optimizes the parameters of sound quality in the process of development and production to achieve the best sound quality through the hearing evaluation. All the important features of the audio equipment power supply (voltage stability, noise level, symmetry of positive and negative power supply) have reached the highest performance of the industry. Compared with the power IC used in the sound equipment, it can provide extremely clean electricity. In the sound market with high sound quality, the sound quality, such as sound image (location of a sound source, distance sense) and resolution (sense of sense and deep sense), can be improved by the power line.
The product has been sold in January 2018 (the price of the sample is 2000 yen / A: no tax), and is expected to begin in June 2018 and put into production on the scale of 100 thousand per month. The production base of the prophase process is ROHM Hamamatsu (Hamamatsu), and the production base of the latter process is ROHM Electronics Philippines, Inc. (Philippines).
In the future, ROHM will continue to expand its product lineup with sound quality design technology to meet the high quality demand of the time.
"Background"
In recent years, with the popularity of high-resolution sound sources, audio devices and audio devices, which are required to make reliable devices and components, have accurate expressiveness for the original information of the sound source. Among them, the quality of power supply to the audio device has a great influence on the sound quality, and the power IC plays an important role in providing clean electric power with small voltage fluctuation and small noise. Moreover, to achieve a clean power supply, three important characteristics (voltage stability, noise level, symmetry of positive and negative power) are excellent, but there is no such power IC in the past, which has become a major issue in the realization of high sound quality.
This time, ROHM condensing into the power system technology of the company's power supply IC analog design technology and original sound quality design technology advantages, the successful development of the world's main three important features are excellent sound audio power IC.
"Characteristics"
This product has the following characteristics as the world's leading power supply for IC.
1., providing clean power helps improve the quality of sound equipment.
1) the voltage is more stable and the sound quality is higher.
A newly developed error amplifier circuit, which is able to respond at a wider band at high speed, is built-in. The impact of input voltage and output current fluctuation on output voltage is reduced to a minimum. It can perfectly show the original base and sense of grandeur.
2) the noise is smaller and the sound quality is higher.
A muffled noise structure, which can suppress noise generated by IC internal circuit, is applied to achieve 4.6 1/50 Vrms low noise level (the lowest level in the industry). By eliminating the influence of noise on sound quality, we can produce clear and transparent sound.
3) the positive and negative power supply is symmetrical and the sound quality is higher
ROHM has not only assured power but also negative power products with consistent circuit structure. Through the combination of the two, power supply with ideal symmetry is realized in the characteristic aspect. It can confirm the location of sound and image, and it can well express the spatial transmission power of voice.
2., the product lineup is abundant, which can meet the demand for high quality sound.
Product lineup includes: BD37201NUX very suitable for digital devices (DA converters, DSP and so on) working at low voltage, BD37210MUV (positive power) and BD37215MUV (negative power) and BD37215MUV (positive power) and BD37215MUV (positive power) and BD37215MUV (positive power) and BD37215MUV (negative power) that are very suitable for working in high voltage or positive and negative power supply. . In the future, we will continue to broaden our product lineup on the basis of these products, and strongly support the development of high quality sound equipment.
"Applied examples"
Hi-Fi audio -- home audio -- portable audio -- wireless speaker
All the sound equipment that needs high sound quality
"Terminology"
*1) High-resolution Sound Source.
The sampling frequency of music played by CD is 44.1kHz, the quantile is 16bit, and the sampling frequency of high-resolution sound source is more than 96kHz, and the quantile number 24bit is more common. That just says, the information content of high resolution voice is much more than that of ordinary music CD, so that it can achieve high quality.
*2) Hi-Fi (High Fidelity, high fidelity) sound
High Fidelity is high fidelity. It refers to the high fidelity sound designed to faithfully reproduce the original information of the sound source.