Class D audio amp eliminates filters, smooths design for portable devices

Irvine, CA — Microsemi Corporation, a manufacturer of high performance analog/mixed signal integrated circuits, has announced its newest generation of Class-D audio amplifiers, a CMOS design targeted for LCD TVs, desktop monitors, cell phones, PDAs and other handheld or portable audio applications.

Designated the LX1701, the new Class-D amplifier can drive up to 3 watts of mono output into 2 Ohm speakers, or 2 watts output into 4 Ohm speakers, providing full 20Hz to 20kHz high audio fidelity, with a total harmonic distortion (THD) of less than 1%.

A very low quiescent current consumption of 2 milli-amps results from a proprietary output modulation design that also enables filter-less operation in many applications. A wide 1.8 to 6.0 supply voltage range allows the LX1701 to be used at almost all power supply or battery conditions. Low EMI performance allows the LX1701 to reside on circuit boards close to interference sensitive circuits such as audio and video receivers.

The LX1701 is delivered in a low profile, surface-mountable 16-pin lead-free MLPQ package measuring only 4mm square and 1 mm high. It is available for immediate sampling and delivery, with 10K quantity pricing at $0.88.

Samples and evaluation boards can be requested through this site, from Microsemi sales representatives or through Microsemi's distribution sales channel.

LX1701 Application circuit
Typical Application Circuit

Microsemi is a leading designer, manufacturer and marketer of analog, mixed-signal and discrete semiconductors. The company's semiconductors manage and control or regulate power, protect against transient voltage spikes and transmit, receive and amplify signals.

Microsemi's products include individual components as well as complete circuit solutions that enhance customer designs by improving reliability, battery optimization, reducing size or protecting circuits. Markets the company serves include mobile connectivity, computer/peripherals, telecom/datacom, medical, industrial, automotive, digital media, space/satellite and military.

More information may be obtained by contacting the company directly or by visiting its web site at

LX1701 data sheet

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