MAX9850ETI+ Class AB Stereo Audio Amplifier IC - High Performance & Low Power
MAX9850ETI+ Class AB Stereo Audio Amplifier IC - High-Performance Audio Solution
The MAX9850ETI+ from Analog Devices Inc./Maxim Integrated is a premium Class AB stereo audio amplifier IC designed for demanding audio applications in portable electronics. This comprehensive guide explores its technical specifications, unique features, and ideal use cases to help engineers and designers make informed decisions for their audio system designs.
In-Depth Product Overview
As a member of Maxim Integrated's renowned audio amplifier portfolio, the MAX9850ETI+ combines high-fidelity sound reproduction with exceptional power efficiency. Its advanced architecture makes it particularly suitable for:
- Smartphones and tablets
- Portable media players
- Bluetooth headphones
- Gaming devices
- Automotive infotainment systems
Detailed Technical Specifications
Amplifier Classification: Class AB
The Class AB design offers the perfect balance between audio quality and power efficiency:
- Lower distortion than Class B amplifiers
- Higher efficiency than Class A designs (typically 50-70%)
- Minimal crossover distortion
- Excellent linearity across the audio spectrum
Power Output Capabilities
The amplifier delivers robust performance with:
- 95mW per channel into 16 loads
- Dynamic range exceeding 100dB
- THD+N typically 0.01% at 1kHz
Power Supply Characteristics
Designed for battery-operated devices:
- Wide operating range: 1.8V to 3.6V
- Ultra-low quiescent current: 2.3mA typical
- Shutdown current: <1 A
Advanced Feature Set
The MAX9850ETI+ incorporates multiple professional-grade features:
- Integrated 24-bit DAC with 96kHz sampling
- Advanced depop circuitry for noise-free operation
- Digital inputs (I S and I C compatible)
- Software-controllable volume (64-step attenuation)
- Independent channel mute controls
- Click-and-pop suppression
Package and Thermal Considerations
The device comes in a space-saving 28-TQFN (5x5) package with exposed pad:
- Dimensions: 5mm 5mm 0.8mm
- Enhanced thermal performance
- RoHS-compliant construction
Application Circuit Design Guidelines
For optimal performance:
- Use proper power supply decoupling (0.1 F ceramic + 1 F tantalum recommended)
- Implement star grounding for analog and digital sections
- Keep audio traces short and away from noisy signals
- Utilize the exposed pad for effective heat dissipation
Comparison with Competing Solutions
The MAX9850ETI+ offers distinct advantages over similar audio amplifiers:
| Feature | MAX9850ETI+ | Competitor A | Competitor B |
|---|---|---|---|
| Power Efficiency | |||
| THD+N | 0.01% | 0.03% | 0.02% |
| Integration | DAC + Amp | Amp Only | Amp Only |
| Digital Control | Yes | No | Limited |
Design Resources and Support
Maxim Integrated provides comprehensive support materials:
- Detailed evaluation kit (MAX9850EVKIT)
- Reference designs for common applications
- SPICE models for simulation
- Application notes covering layout and troubleshooting
Purchasing Information
The MAX9850ETI+ is available through authorized distributors:
- Available in tape and reel packaging (2500 units per reel)
- Standard lead time: 6-8 weeks
- RoHS and REACH compliant
Conclusion
The MAX9850ETI+ represents an optimal solution for designers seeking to implement high-quality audio in space- and power-constrained applications. Its combination of excellent audio performance, flexible digital interface, and efficient operation makes it stand out in the crowded audio amplifier market. Whether you're upgrading an existing design or starting a new audio project, the MAX9850ETI+ delivers the performance and features needed to create outstanding audio experiences.
For engineers looking to push the boundaries of portable audio quality while maintaining strict power budgets, the MAX9850ETI+ offers an unbeatable combination of features and performance. Its robust design and manufacturer support ensure reliable operation in even the most demanding applications.