MAXIM MAX9775 MAX9776 2x1.5W, Stereo Class-D Audio Subsystem with DirectDrive Headphone Amplifier
Summary
High-efficiency Class D audio subsystems designed for next-generation portable electronics, including cell phones and multimedia players. This device offers powerful 1.5W stereo output, dedicated headphone amplification, and revolutionary DirectDrive technology featuring ultra-low EMI and high efficiency up to 79%. The comprehensive manual provides system integrators with detailed specifications, I²C control guidance, packaging options, and application circuit schematics needed for reliable audio design in space-constrained environments.
Page 1 Text Content
19-0746; Rev 4; 8/08
2 x 1.5W, Stereo Class D Audio Subsystem with Direct Drive Headphone Amplifier General Description Features
The MAX9775/MAX9776 combine a high-efficiency Unique Spread-Spectrum Modulation and Active Class D, stereo/mono audio power amplifier with a Emissions Limiting Significantly Reduces EMI
mono Direct Drive® receiver amplifier and a stereo 3D Stereo Enhancement (MAX9775 Only) Direct Drive headphone amplifier.
Up to 3 Stereo Inputs
Maxim’s 3rd-generation, ultra-low-EMI, Class D audio
1.5W Stereo Speaker Output (4Ω, VDD = 5V)
power amplifiers provide Class AB performance with
50m W Mono Receiver/Stereo Headphone Outputs
Class D efficiency. The MAX9775/MAX9776 deliver
(32Ω, VDD = 3.3V)
1.5W per channel into a 4Ω load from a 5V supply and
High PSRR (68d B at 217Hz)
offer efficiencies up to 79%. Active emissions limiting
circuitry and spread-spectrum modulation greatly 79% Efficiency (VDD = 3.3V, RL = 8Ω, POUT
reduce EMI, eliminating the need for output filtering 470m W)
found in traditional Class D devices. I2C Control—Input Configuration, Volume Control,
Output Mode
The MAX9775/MAX9776 utilize a fully differential archi-
tecture, a full-bridged output, and comprehensive click- Click-and-Pop Suppression
and-pop suppression. A 3D stereo enhancement
Low Total Harmonic Distortion (0.03% at 1k Hz)
function allows the MAX9775 to widen the stereo sound
Current-Limit and Thermal Protection
field immersing the listener in a cleaner, richer sound
Available in Space-Saving, 36-Bump WLP (3mm x
experience than typically found in portable applications.
3mm) and 32-Pin TQFN (5mm x 5mm) Packages
The devices utilize a flexible, user-defined mixer archi- tecture that includes an input mixer, volume control, and Ordering Information output mixer. All control is done through I2C.
CLASS D
The mono receiver amplifier and stereo headphone PART PIN-PACKAGE
AMPLIFIER
amplifier use Maxim’s Direct Drive architecture that pro-
duces a ground-referenced output from a single supply, MAX9775EBX+T 36 WLP* Stereo
eliminating the need for large DC-blocking capacitors, MAX9776ETJ+ 32 TQFN-EP** Mono saving cost, space, and component height.
MAX9776EBX+T 36 WLP* Mono
The MAX9775 is available in a 36-bump WLP (3mm x Note: All devices are specified over the -40°C to +85°C oper-
3mm) package. The MAX9776 is available in a 32-pin ating temperature range. TQFN (5mm x 5mm) or a 36-bump WLP (3mm x 3mm) +Denotes a lead-free/Ro HS-compliant package. package. Both devices are specified over the extended *Four center bumps depopulated. -40°C to +85°C temperature range. **EP = Exposed pad. Pin Configurations appear at end of data sheet.
Applications
Direct Drive is a registered trademark of Maxim Integrated
Cell Phones
Products, Inc.
Portable Multimedia Players Handheld Gaming Consoles
Simplified Block Diagrams
SINGLE SUPPLY 2.7V TO 5.5V SINGLE SUPPLY 2.7V TO 5.5V
GAIN SOUND GAIN CONTROL CONTROL CONTROL
MIXER/ MIXER/ MUX MUX
I2C I2C INTERFACE INTERFACE
MAX9775 MAX9776
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Page Summary Contents For MAXIM MAX9775 MAX9776 2x1.5W, Stereo Class-D Audio Subsystem with DirectDrive Headphone Amplifier
Manual Details
| Brand | Audio |
|---|---|
| Pages | 38 |
| File Size | 652.71 KB |
| Published | May 15, 2026 |
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Frequently Asked Questions
What unique features improve sound quality?
Features include DirectDrive architecture, 3D Stereo Enhancement (MAX9775 only), and Click-and-Pop suppression.
Can these amplifiers run on a single power supply?
Yes, they operate using single supplies ranging from 2.7V to 5.5V, eliminating the need for large DC-blocking capacitors.
What are the specified maximum operating temperatures?
All devices are specified over an extended temperature range of -40°C to +85°C.
What is the typical audio output power per channel?
The chips deliver 1.5W stereo output into a 4Ω load from a 5V supply.