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Quad audio driver outputs full signals

Sunnyvale, Calif. — Maxim Integrated Products Inc.'s DirectDrive quad, audio line driver is said to provide complete line-output from a +5 volt or +3.3 V supply for consumer audio systems.

When operated from a single +5 V supply, the MAX9727 outputs 3-V rms signal levels; with a +3.3 V supply, the device outputs 2 V rms signals.

The MAX9727 is aimed at multichannel PC sound cards, set-top boxes, A/V receivers, DVD players, and a variety of portable media players.

Maxim's DirectDrive technology creates an on-chip negative supply, which allows the MAX9727 line driver to output full line-level signals while operating from a single power supply. The device's output signal is biased at ground, which eliminates the need for dc-blocking capacitors, improves the low-frequency response, reduces distortion, and saves cost, according to Maxim.

Integrated differential inputs are said to improve system noise management. Gain can be precisely controlled by external resistors. The MAX9727 features a 100 dB power supply rejection ratio (PSRR), 111dB signal-to-noise ratio (SNR), and ultra-low 0.0005 percent total harmonic distortion plus noise (THD+N). Maxim’s click-and-pop suppression technology is said to eliminate audible transients on power and shutdown cycles.

 
 
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The MAX9727 is available in lead-free, 20-pin QSOP. Specifications are guaranteed over the extended -40°C to +85°C temperature range. Pricing for the MAX9727EEP+ starts at 79 cents (1,000-up, FOB USA). Click here for the preliminary MAX9727 data sheet.

Maxim , 1-800-998-8800, www.Maxim-ic.com.

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