MAX9708
Info: : PRODUCTION
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MAX9708

20W/40W, Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $5.87
Features
  • 2 x 21W Output Power in Stereo Mode (8Ω, THD = 10%)
  • 1 x 42W 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
  • SYNC Input/Output
  • Available in Thermally Efficient, Space-Saving 56-Pin TQFN Package
Additional Details
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The MAX9708 mono/stereo, Class D audio power amplifier delivers up to 2 x 21W into an 8Ω stereo mode and 1 x 42W into a 4Ω load in mono mode while offering up to 87% efficiency. The MAX9708 provides Class AB amplifier performance with the benefits of Class D efficiency, eliminating the need for a bulky heatsink and conserving power. The MAX9708 operates from a single +10V to +18V supply, driving the load in a BTL configuration.

The MAX9708 offers two modulation schemes: a fixed-frequency modulation (FFM) mode, and a spread-spectrum modulation (SSM) mode that reduces EMI-radiated emissions. The MAX9708 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 MAX9708 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

  • Automotive
  • LCD TVs
  • PC/HiFi Audio Solutions
  • PDP TVs
Part Models 2
1ku List Price Starting From $5.87

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX9708ETN+D
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  • HTML
MAX9708ETN+TD
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX9708EVKIT

Evaluation Kit for the MAX9708

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MAX9708EVKIT

Evaluation Kit for the MAX9708

Evaluation Kit for the MAX9708

Features and Benefits

  • 10V to 18V Single DC Power-Supply Operation
  • Fully Differential or Single-Ended Inputs
  • Fully Differential Outputs
  • Drives 2 x 21W into 8Ω Speakers in Stereo Mode
  • Drives 1 x 42W into 4Ω Speaker in Mono Mode
  • Selectable Between Spread-Spectrum and Fixed-Frequency Modulation
  • Selectable Gains (+22dB, +25dB, +29.5dB, or +36dB)
  • Programmable Thermal Flag
  • Shutdown and Mute Control
  • Input and Output Clock Sync Signals
  • Thermally Efficient 56-Pin TQFN-EP Package
  • Fully Assembled and Tested

Product Detail

The MAX9708 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that configures the MAX9708 Class D amplifier to drive 2 x 21W into a pair of 8Ω speakers in stereo mode, or 1 x 42W into a single 4Ω speaker in mono mode for audio applications. The EV kit’s speaker outputs can be filterless to minimize the circuit area or can be filtered to ease evaluation.

The EV kit operates from a 10VDC to 18VDC power supply. The MAX9708 EV kit accepts single-ended or differential input signals, and provides fully differential outputs. The EV kit provides an option to select between +22dB, +25dB, +29.5dB, or +36dB gains. The MAX9708 EV kit offers an option to select between fixed-frequency modulation (FFM) mode or spread-spectrum modulation (SSM) mode.

The MAX9708 EV kit provides a thermal flag that can be programmed for eight different thermal thresholds. The MAX9708 EV kit can be synchronized with an external clock, and the EV kit provides a synchronous output that allows units to be cascaded and frequency locked in a multiamplifier system.

Applications

  • Automotive
  • LCD TVs
  • PC/HiFi Audio Solutions
  • PDP TVs

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