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Amplifier eliminates dc-blocking capacitors, resistors

Posted: 02 Dec 2002 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max4411? headphone amplifier? directdrive technology?

The MAX4411 headphone amplifier from Maxim Integrated Products combines the company's stereo DirectDrive technology and a fixed-gain configuration, eliminating the need for both bulky dc-blocking capacitors and external gain-setting resistors.

DirectDrive generates a ground-referenced output from a single 1.8V to 3.6V supply which, unlike competing solutions, does not require a midrail dc bias voltage to be applied to the headphone jack ground pin. This is claimed by the company to double the dynamic range of the output swing and simplify end-product design and reliability.

Besides minimizing size, the elimination of dc-blocking capacitors improves the amplifier's low-frequency response and allows full range, audio reproduction needed for music and video playback.

Available in a 16-bump, 2-by-2-by-0.6mm CSP or a 20-pin, 4-by-4-by-0.8mm CFN package, the MAX4411 is suitable for integration into portable devices such as cellphones, MP3 players, PDAs, notebooks, and portable DVD players.

The MAX4411 has a fixed gain of -1.5V/V, produces 80mW per channel into a 16-ohm load, has 0.003 percent THD + N, and a PSR of 86dB. Independent left/right, low-power shutdown controls make it possible to optimize power savings in mixed-mode mono/stereo applications.

It also has comprehensive click-and-pop reduction circuitry to ensure fast turn-on/turn-off times without audible glitches. The outputs include 8kV ESD protection.

The amplifier is screened for operation over the -40C to 85C temperature range.

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