2.3W, High-Power Class D Audio Subsystem with DirectDrive Headphone Amplifiers

The MAX9796 combines a high-efficiency Class D, mono audio power amplifier with a mono DirectDrive® receiver amplifier and a stereo DirectDrive headphone amplifier.

Maxim's 3rd-generation, ultra-low EMI, Class D audio power amplifiers provide Class AB performance with Class D efficiency. The MAX9796 delivers 2.3W into a 4Ω load from a 5V supply and offers efficiencies up to 80%. Active emissions limiting circuitry and spread-spectrum modulation greatly reduce EMI, eliminating the need for output filtering found in traditional Class D devices.

The MAX9796 features a fully differential architecture, a full-bridged output, and comprehensive click-and-pop suppression. The device utilizes a flexible, user-defined mixer architecture that includes an input mixer, volume control, and output mixer. All controls are done through an I²C interface.

The mono receiver amplifier and stereo headphone amplifier use Maxim's DirectDrive architecture, that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, space, and component height.

The MAX9796 is available in a 36-bump UCSP™ (3mm x 3mm) package and is specified over the extended -40°C to +85°C temperature range.

Applications

* Cell Phones * Handheld Gaming Consoles * Portable Multimedia Players

* Unique Spread-Spectrum Modulation and Active Emissions Limiting Significantly Reduces EMI

* Up to 3 Stereo Inputs

* 2.3W Mono Speaker Output (4Ω, VDD = 5V)

* 50mW Mono Receiver/Stereo Headphone Outputs (32Ω, VDD = 3.3V)

* High PSRR (68dB at 217Hz)

* 80% Efficiency (VDD = 3.3V, RL = 8Ω, POUT = 600mW)

* I²C Control—Input Configuration, Volume Control, Output Mode

* Click-and-Pop Suppression

* Low Total Harmonic Distortion (0.03% at 1kHz)

* Current-Limit and Thermal Protection

* Available in Space-Saving, 36-Bump UCSP (3mm x 3mm)