Audio Converter/Driver IC suits various portable devices.October 2, 2009 -
Model TS4657 combines audio DAC and line-driver functions to feed audio line-out connection of various portable home and audio products. Internal power management unit enables IC to produce 2.2 Vrms audio-output signal for voltages from 3.0-5.5 V. It can generate negative and positive voltages, allowing audio signal to be referenced to ground. With operating current of 7.4 mA, circuit achieves 93 dB dynamic range, 80 dB Power Supply Rejection Ratio at 217 Hz, and 81 dB THD+N at 0 dBFS.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
STMicroelectronics
10 Maguire Road
Lexington, MA, 02421
USA
Combined Audio Converter/Driver IC from STMicroelectronics Delivers Extra Power and Size Savings for Portable and Home Audio Products
Integrated DAC and line-out driver saves at least four external components and cuts typical power consumption by over two thirds
Geneva, September 25, 2009 - Combined audio converter/driver ICs are simplifying the design of set-top boxes and other consumer audio/video products, but the new TS4657 from STMicroelectronics (NYSE: STM), a leading provider of digital audio ICs, improves on this by saving additional external components while reducing power consumption and improving sound quality.
ST's new TS4657 is a single chip combining audio-DAC (digital-to-analog converter) and line-driver functions to feed the audio Line-Out connection of set-top boxes, DVD players, portable multimedia devices, sound cards, or similar equipment. The Line Out provides a direct connection to drive an external home amplifier.
The IC uses an internal power management unit to produce a 2.2Vrms audio-output signal for voltages from 3.0V to 5.5V, eliminating the need for a separate high-voltage power supply to drive the Line-Out output. Similar devices typically require four external capacitors for the charge pumps but ST's high-frequency design integrates these on-chip, thereby saving board space and bill-of-materials costs. In addition, the ability to generate negative and positive voltages allows the audio signal to be referenced to ground, which saves the need for a decoupling capacitor in the audio-signal line.
The TS4657 also increases flexibility for designers since it can be operated from any supply voltage from 3.0V to 5.5V. Hence design is simplified and engineers can use the same device for a variety of products. The operating current of only 7.4mA, three times smaller than the nearest competing device, leads to improved efficiency. By achieving 93dB dynamic range, 80dB Power Supply Rejection Ratio (at 217Hz), and 81dB THD+N at 0dBFS, this device also helps maximize the audio performance of equipment connected to the Line-Out.
The TS4657 is in production now, available in the 4 x 4mm QFN20 package and priced at $0.91 in quantities of 1000 units.
About STMicroelectronics
STMicroelectronics is a global leader serving customers across the spectrum of electronics applications with innovative semiconductor solutions. ST aims to be the undisputed leader in multimedia convergence and power applications leveraging its vast array of technologies, design expertise and combination of intellectual property portfolio, strategic partnerships and manufacturing strength. In 2008, the Company's net revenues were $9.84 billion. Further information on ST can be found at www.st.com.
Carol Brown
STMicroelectronics
Media Relations
WW Technical Articles Manager
603-465-9213
|
|
|
|
|
|
|
| 
