Overview
Features and Benefits
- 2 x 25W Output Power in Stereo Mode (8Ω, THD = 10%)
- 1 x 50W Output Power in Mono Mode (4Ω, THD = 10%)
- High Efficiency: Up to 87%
- Filterless Class D Amplifier
- Unique Spread-Spectrum Mode
- Programmable Gain (+22dB, +25dB, +29.5dB, +36dB)
- High PSRR (90dB at 1kHz)
- Differential Inputs Suppress Common-Mode Noise
- Shutdown and Mute Control
- Integrated Click-and-Pop Suppression
- Low 0.1% THD+N
- Current Limit and Thermal Protection
- Programmable Thermal Flag
- Clock Synchronization Input and Output
- Available in Thermally Efficient, Space-Saving Package: 56-Pin TQFN
Product Details
The MAX9709 stereo/mono, Class D audio power amplifier delivers up to 2 x 25W into an 8Ω stereo mode and 1 x 50W into a 4Ω load in mono mode while offering up to 87% efficiency. The MAX9709 provides Class AB amplifier performance with the benefits of Class D efficiency, eliminating the need for a bulky heatsink and conserving power. The MAX9709 operates from a single +10V to +22V supply, driving the load in a BTL configuration.
The MAX9709 offers two modulation schemes: a fixed-frequency modulation (FFM) mode, and a spread-spectrum modulation (SSM) mode that reduces EMI-radiated emissions. The MAX9709 can be synchronized to an external clock from 600kHz to 1.2MHz. A synchronized output allows multiple units to be cascaded in the system.
Features include fully differential inputs, comprehensive click-and-pop suppression, and four selectable-gain settings (22dB, 25dB, 29.5dB, and 36dB). A pin-programmable thermal flag provides seven different thermal warning thresholds. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition.
The MAX9709 is available in a 56-pin TQFN (8mm x 8mm x 0.8mm) package, and is specified over the extended -40°C to +85°C temperature range.
Applications
- LCD TVs
- PC/HiFi Audio Solutions
- PDP TVs
Product Categories
Markets and Technologies
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Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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