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Features
- Filterless Amplifier Passes FCC-Radiated Emissions Standards with 24in of Cable
- Unique Spread-Spectrum Mode and Active Emissions Limiting (AEL) Achieves Better than 20dB Margin Under FCC Limits
- Zero Dead Time (ZDT) H-Bridge Maintains State-of-the-Art Efficiency and THD+N
- Simple Master-Slave Setup for Stereo Operation
- Up to 90% Efficiency
- 2.3W into 4Ω (1% THD+N)
- Low 0.02% THD+N (POUT = 1W, VDD = 5.0V)
- High PSRR (75dB at 217Hz)
- Integrated Click-and-Pop Suppression
- Low Quiescent Current (5.4mA)
- Low-Power Shutdown Mode (0.3µA)
- Short-Circuit and Thermal-Overload Protection
- Available in Thermally Efficient, Space-Saving Packages
- 10-Pin TDFN (3mm x 3mm x 0.8mm)
- 12-Bump UCSP (1.5mm x 2mm x 0.6mm)
- Pin-for-Pin Compatible with the MAX9700 and MAX9712
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The MAX9705 3rd-generation, ultra-low EMI, mono, Class D audio power amplifier provides Class AB performance with Class D efficiency. The MAX9705 delivers 2.3W into a 4Ω load and offers efficiencies above 85%. Active emissions limiting (AEL) circuitry greatly reduces EMI by actively controlling the output FET gate transitions under all possible transient output-voltage conditions. AEL prevents high-frequency emissions resulting from conventional Class D free-wheeling behavior in the presence of an inductive load. Zero dead time (ZDT) technology maintains state-of-the-art efficiency and THD+N performance by allowing the output FETs to switch simultaneously without cross-conduction. A spread-spectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices. These design concepts reduce an application's component count and extend battery life.
The MAX9705 offers two modulation schemes: a fixed-frequency (FFM) mode and a spread-spectrum (SSM) mode that further reduces EMI-radiated emissions due to the modulation frequency. The MAX9705 oscillator can be synchronized to an external clock through the SYNC input, allowing the switching frequency to be externally defined. The SYNC input also allows multiple MAX9705s to be cascaded and frequency locked, minimizing interference due to clock intermodulation. The device utilizes a fully differential architecture, a full-bridged output, and comprehensive click-and-pop suppression. The gain of the MAX9705 is set internally (MAX9705A: 6dB, MAX9705B: 12dB, MAX9705C: 15.6dB, MAX9705D: 20dB), further reducing external component count.
The MAX9705 is available in 10-pin TDFN (3mm x 3mm x 0.8mm) and 12-bump UCSP™ (1.5mm x 2mm x 0.6mm) packages. The MAX9705 is specified over the extended -40°C to +85°C temperature range.
Applications
- Cellular Phones
- MP3 Players
- PDAs
- Portable Audio
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MAX9705
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Data Sheet
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MAX9705: 2.3W, Ultra-Low-EMI, Filterless, Class D Audio Amplifier Data Sheet (Rev.3)
Reliability Data
1
33.80K
Design Note
3
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Data Sheet 1
Reliability Data 1
Design Note 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
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- MAX9705AETB+
- Pin/Package Drawing
-
Thin Dual Flatpack No Leads, Exposed Pad
- Documentation
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HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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Ultra Librarian
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SamacSys
- MAX9705AETB+T
- Pin/Package Drawing
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Thin Dual Flatpack No Leads, Exposed Pad
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- MAX9705BETB+
- Pin/Package Drawing
-
Thin Dual Flatpack No Leads, Exposed Pad
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
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SamacSys
- MAX9705BETB+T
- Pin/Package Drawing
-
Thin Dual Flatpack No Leads, Exposed Pad
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
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SamacSys
- MAX9705CETB+
- Pin/Package Drawing
-
Thin Dual Flatpack No Leads, Exposed Pad
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- MAX9705CETB+T
- Pin/Package Drawing
-
Thin Dual Flatpack No Leads, Exposed Pad
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- MAX9705DETB+
- Pin/Package Drawing
-
Thin Dual Flatpack No Leads, Exposed Pad
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- MAX9705DETB+T
- Pin/Package Drawing
-
Thin Dual Flatpack No Leads, Exposed Pad
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
Filter by Model
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Product Lifecycle
PCN
Jun 20, 2016
- 1612
ASSEMBLY
MAX9705AETB+
PRODUCTION
MAX9705AETB+T
PRODUCTION
MAX9705BETB+
PRODUCTION
MAX9705BETB+T
PRODUCTION
MAX9705CETB+T
PRODUCTION
MAX9705DETB+
PRODUCTION
MAX9705DETB+T
PRODUCTION
Jan 9, 2015
- 1481
WAFER FAB
MAX9705AETB+
PRODUCTION
MAX9705AETB+T
PRODUCTION
MAX9705BETB+
PRODUCTION
MAX9705BETB+T
PRODUCTION
MAX9705CETB+
PRODUCTION
MAX9705CETB+T
PRODUCTION
MAX9705DETB+
PRODUCTION
MAX9705DETB+T
PRODUCTION
Filter by Model
Part Models
Product Lifecycle
PCN
Jun 20, 2016
- 1612
ASSEMBLY
MAX9705AETB+
PRODUCTION
MAX9705AETB+T
PRODUCTION
MAX9705BETB+
PRODUCTION
MAX9705BETB+T
PRODUCTION
MAX9705CETB+T
PRODUCTION
MAX9705DETB+
PRODUCTION
MAX9705DETB+T
PRODUCTION
Jan 9, 2015
- 1481
WAFER FAB
MAX9705AETB+
PRODUCTION
MAX9705AETB+T
PRODUCTION
MAX9705BETB+
PRODUCTION
MAX9705BETB+T
PRODUCTION
MAX9705CETB+
PRODUCTION
MAX9705CETB+T
PRODUCTION
MAX9705DETB+
PRODUCTION
MAX9705DETB+T
PRODUCTION
Software & Part Ecosystem
| Parts | Product Life Cycle | Description | ||
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1.3W, Filterless, Stereo Class D Audio Power Amplifier |
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1.8W, Filterless, Stereo, Class D Audio Power Amplifier and DirectDrive Stereo Headphone Amplifier |
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Stereo Audio CODECs with Microphone, DirectDrive Headphones, Speaker Amplifiers, or Line Outputs |
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Evaluation Kits 1
MAX9700BEVKIT
Evaluation Kit for the MAX9700A, MAX9700B, MAX9700C, MAX9700D, and MAX9712
Features and Benefits
- Filterless Operation Passes FCC Radiated Emissions
- Evaluates the MAX9700A/B/C/D or MAX9712 (with IC Replacement)
- 2.5V to 5.5V Single-Supply Operation
- Up to 94% Efficiency
- Drives 1.2W into 8Ω Speaker at 1% THD+N
- Differential or Single-Ended Inputs
- Selectable Switching Frequency
- 0.1µA Shutdown Current
- Small 10-Pin TDFN Package
- Also Available in 10-Pin µMAX® and 12-Bump UCSP™ Packages
- Fully Assembled and Tested
Product Detail
The MAX9700B evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX9700B filterless class D amplifier to drive a mono bridge-tied-load (BTL) speaker in portable audio applications. Designed to operate from a 2.5V to 5.5V DC power supply, the EV kit is capable of delivering 1.2W into an 8Ω load.
The EV kit accepts differential or single-ended input signals. The EV kit provides an option to select between different switching frequency modes of operation. The MAX9700B EV kit also evaluates the MAX9700A/MAX9700C/MAX9700D and the MAX9712.
Applications
- Cell Phones
- MP3 Players
- PDAs
- Portable Audio