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

Product Details

Key Features

Applications/Uses

Parametric specs for Speaker Amplifiers
# Channels 2
Class D
Spkr. Amp. VCC (V) (min) 10
Spkr. Amp. VCC (V) (max) 18
Spkr. Amp. ICC (mA) (typ) 20
POUT into 4Ω @ 1% THD+N (W) (min) 32
POUT into 4Ω @ 10% THD+N (W) (min) 42
POUT into 8Ω @ 1% THD+N (W) (min) 16
POUT into 8Ω @ 10% THD+N (W) (min) 21
Spkr. Amp. Half Pwr. THD+N (%) 0.15
SNR (dB) (A- Weighted) 95
PSRR (dB) (min) 90
Package/Pins TQFN/56
Budgetary
Price (See Notes)
3.61
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Simplified Block Diagram

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Parameters

Parametric specs for Speaker Amplifiers
# Channels 2
Class D
Spkr. Amp. VCC (V) (min) 10
Spkr. Amp. VCC (V) (max) 18
Spkr. Amp. ICC (mA) (typ) 20
POUT into 4Ω @ 1% THD+N (W) (min) 32
POUT into 4Ω @ 10% THD+N (W) (min) 42
POUT into 8Ω @ 1% THD+N (W) (min) 16
POUT into 8Ω @ 10% THD+N (W) (min) 21
Spkr. Amp. Half Pwr. THD+N (%) 0.15
SNR (dB) (A- Weighted) 95
PSRR (dB) (min) 90
Package/Pins TQFN/56
Budgetary
Price (See Notes)
3.61

Key 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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX9708: Simplified Block Diagram MAX9708: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .