NE58633 Datasheet, PDF(1/27 Page) NXP Semiconductors – Noise reduction class-D headphone driver amplifier

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NE58633 Datasheet, PDF (1/27 Pages) NXP Semiconductors – Noise reduction class-D headphone driver amplifier

NE58633

Noise reduction class-D headphone driver ampliï¬er

Rev. 02 â 25 May 2009

Product data sheet

1. General description

The NE58633 is a stereo, noise reduction, class-D, Bridge-Tied Load (BTL) headphone

driver ampliï¬er. Each channel comprises a class-D BTL headphone driver ampliï¬er, an

electret microphone low noise preampliï¬er, feedback noise reduction circuit and a music

ampliï¬er input.

The NE58633 operates with a battery voltage of 0.9 V to 1.7 V. The chip employs an

on-chip DC-to-DC boost converter and internal Vref voltage reference which is ï¬ltered and

output to ground for noise decoupling. It features mute control and plop and click reduction

circuitry. The gain of the microphone ampliï¬er and ï¬lter ampliï¬er is set using external

resistors. Differential architecture provides increased immunity to noise.

The NE58633 is capable of driving 800 mVrms across a 16 â¦ or 32 â¦ load and provides

ElectroStatic Discharge (ESD) and short-circuit protection.

It is available in the 32-pin HVQFN32 (5 mm Ã 5 mm Ã 0.85 mm) package suitable for high

density small-scale layouts and is an ideal choice for noise reduction headphones and

educational audio aids.

2. Features

I Low current consumption of 4.4 mA

I 0.9 V to 1.7 V battery operating voltage range

I 1 % THD+N at VO = 1 VM driving 16 â¦ with a battery voltage of 1.5 V

I 10 % THD+N at 800 mVrms output voltage driving 16 â¦ and 32 â¦ loads with a battery

voltage of 1.5 V

I Output noise voltage with noise reduction circuit typically 31 mVrms for Gv(cl) = 25 dB

I On-chip mute function

I Plop and click reduction circuitry

I Class-D BTL differential output conï¬guration

I Electret microphone noise reduction polarization ampliï¬er with external gain

adjustment using resistors

I Music and ï¬lter ampliï¬er with external gain adjustment using resistors

I DC-to-DC converter circuitry (3 V output) with 2.5 mA (typical) load current

I Internal voltage reference pinned out for noise decoupling

I Available in HVQFN32 package

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