Diodes : Converter-amplifier improves audio performance

Diodes Incorporated has introduced an 8 channel DAC and pre-amplifier chip offering designers of audio video receivers (AVR) and add-on sound cards the opportunity to reduce component costs while at the same time improving audio performance. Part of the Zetex Direct Digital Feedback Amplifier (DDFA™) product line, the ZXCZM800 will dramatically reduce circuit complexity, and in high performance differential mode, will deliver a dynamic range (DNR) as high as 126db. The outstanding performance of the DAC solution complements that of digital amplifiers created using the DDFA chipset.

In both consumer and professional audio product designs currently depending on the use of multiple quality 2-channnel DACs to achieve mid- to high-level audio performance goals, the ZXCZM800 offers the means to significantly reduce component inventory and PCB size. At the same time, with typical mid-range AVRs and sound cards currently producing a DNR of 112dB, the Diodes chip is more than capable of matching or improving upon existing product sound quality.

For product designers looking to expand a product’s feature set, the ZXCZM800 also offers the option of pre-amplifier DSP features, simply programmed using an existing system host processor. For example, by integrating a digital volume control function, operating on a per channel or and/or all channel basis, the chip is able to further simplify product design, improve performance and reduce cost. A digital multiplexing function enables additional digital inputs to be accommodated and simple implementation of multi-room configuration to be achieved. 14 user programmable biquads per channel facilitate filter functions such as parametric EQ.

In terms of DAC performance metrics, the ZXCZM800 offers a maximum resolution of 32 bits, meaning more headroom and less impact on performance with higher input audio data resolutions. Maximum sample rate is up to 192kHz and DNR in single ended operating mode is 120dB. For distortion and noise, figures less than 0.001% are typical for single ended mode, less than 0.0004% in differential mode.

The ZXCZM800 DAC and pre-amplifier chip is supported by an 8-channel demonstration board, details of which will be made available for volume production DAC and preamplifier designs, and includes circuit diagrams, bill of materials and Gerber files. Further information can be found at

About Diodes Incorporated

Diodes Incorporated (Nasdaq: DIOD), an S&P SmallCap 600 and Russell 3000 Index company, is a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete and analog semiconductor markets, serving the consumer electronics, computing, communications, industrial and automotive markets. Diodes’ products include diodes, rectifiers, transistors, MOSFETs, protection devices, functional specific arrays, amplifiers and comparators, Hall-effect sensors and temperature sensors, power management devices including LED drivers, DC-DC switching, regulators, linear voltage regulators and voltage reference along with special function devices including USB power switch, load switch, voltage supervisor and motor controllers. The Company has its corporate offices in Dallas, Texas, with a sales, marketing, engineering and logistics office in Southern California; design centers in Dallas, San Jose, Taipei, England and Germany; wafer fabrication facilities in Kansas City, Missouri and Manchester, England; two manufacturing facilities in Shanghai, China, one in Neuhaus, Germany and a joint venture facility in Chengdu, China; engineering, sales, warehouse and logistics offices in Taipei, Hong Kong and Manchester, England, and sales and support offices throughout the world.

For further information, including SEC filings, visit the Company’s website at

For further information and reader enquiries:
Rishi Vig, Diodes Incorporated, Zetex Technology Park, Chadderton, Oldham OL9 9LL,UK
Tel: +44 (0)161 622 4444
Fax: +44 (0)161 622 4469
Web: .

Note: The above text is the public part of the press release obtained from the manufacturer (with minor modifications). EETimes Europe cannot be held responsible for the claims and statements made by the manufacturer. The text is intended as a supplement to the new product presentations in EETimes Europe magazine.

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