Simplified Block Diagram
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- Unique Spread-Spectrum Modulation and Active Emissions Limiting Significantly Reduces EMI
- 3D Stereo Enhancement (MAX9775 Only)
- Up to 3 Stereo Inputs
- 1.5W Stereo Speaker Output (4Ω, VDD = 5V)
- 50mW Mono Receiver/Stereo Headphone Outputs (32Ω, VDD = 3.3V)
- High PSRR (68dB at 217Hz)
- 79% Efficiency (VDD = 3.3V, RL = 8Ω, POUT = 470mW)
- 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 WLP (3mm x 3mm) and 32-Pin TQFN (5mm x 5mm) Packages
- Cell Phones—Mid and High Tier
- Handheld Gaming Consoles
- Portable Multimedia Players
Maxim's 3rd-generation, ultra-low-EMI, Class D audio power amplifiers provide Class AB performance with Class D efficiency. The MAX9775/MAX9776 deliver 1.5W per channel into a 4Ω load from a 5V supply and offer efficiencies up to 79%. Active emissions limiting circuitry and spread-spectrum modulation greatly reduce EMI, eliminating the need for output filtering found in traditional Class D devices.
The MAX9775/MAX9776 utilize a fully differential architecture, a full-bridged output, and comprehensive click-and-pop suppression. A 3D stereo enhancement function allows the MAX9775 to widen the stereo sound field immersing the listener in a cleaner, richer sound experience than typically found in portable applications. The devices utilize a flexible, user-defined mixer architecture that includes an input mixer, volume control, and output mixer. All control is done through I²C.
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 MAX9775 is available in a 36-bump WLP (3mm x 3mm) package. The MAX9776 is available in a 32-pin TQFN (5mm x 5mm) or a 36-bump WLP (3mm x 3mm) package. Both devices are specified over the extended -40°C to +85°C temperature range.