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Digital Input Class D Speaker Amplifier with DHT

World's First Soundwire Mid-Power Amplifier with Industry Leading Click-Pop Performance

Product Details

Key Features

Applications/Uses

Parametric specs for Speaker Amplifiers
# Channels 1
Class D
Spkr. Amp. VCC (V) (min) 5.5
Spkr. Amp. VCC (V) (max) 16
Spkr. Amp. ICC (mA) (typ) 6.5
POUT into 4Ω @ 1% THD+N (W) (min) 12.5
POUT into 4Ω @ 10% THD+N (W) (min) 15.3
POUT into 8Ω @ 1% THD+N (W) (min) 13.5
POUT into 8Ω @ 10% THD+N (W) (min) 16.9
Spkr. Amp. Half Pwr. THD+N (%) 0.006
SNR (dB) (A- Weighted) 110
Package/Pins FC2QFN/22
WLP/25
Budgetary
Price (See Notes)
1.78
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Simplified Block Diagram

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Parameters

Parametric specs for Speaker Amplifiers
# Channels 1
Class D
Spkr. Amp. VCC (V) (min) 5.5
Spkr. Amp. VCC (V) (max) 16
Spkr. Amp. ICC (mA) (typ) 6.5
POUT into 4Ω @ 1% THD+N (W) (min) 12.5
POUT into 4Ω @ 10% THD+N (W) (min) 15.3
POUT into 8Ω @ 1% THD+N (W) (min) 13.5
POUT into 8Ω @ 10% THD+N (W) (min) 16.9
Spkr. Amp. Half Pwr. THD+N (%) 0.006
SNR (dB) (A- Weighted) 110
Package/Pins FC2QFN/22
WLP/25
Budgetary
Price (See Notes)
1.78

Key Features

  • Wide Input Supply Range (5.5V to 16V)
  • Dynamic Headroom Tracking (DHT) Maintains a Consistent Listening Experience
  • Integrated Thermal Protection and Output Foldback
  • Remote Output Sensing Allows up to 20dB THD+N Improvement with Ferrite Bead Filters
  • Class D EMI Reduction Enables Filterless Operation
    • Active Emissions Limiting (AEL)
    • Spread-Spectrum Modulation (SSM)
    • Switching Edge Rate Control
  • 110dB A-Weighted Dynamic Range
  • 0.006% THD+N at 3W into 8Ω, f = 1kHz
  • 0.025% THD+N at 3W into 8Ω, f = 6kHz
  • Output Power at 1% THD+N:
    • 13.5W into 8Ω, VPVDD = 16V
    • 12.5W into 4Ω, VPVDD = 12V
  • Output Power at 10% THD+N:
    • 16.9W into 8Ω, VPVDD = 16V
    • 15.3W into 4Ω, VPVDD = 12V
  • Speaker Amplifier Efficiency:
    • 90.5% at 10W into 8Ω, VPVDD = 12V
    • 81% at 15.3W into 4Ω, VPVDD = 12V
  • BDE Provides Supply Brownout Protection
  • Extensive Click-and-Pop Suppression
  • Space Saving Packages
    • 25-Bump WLP (2.17mm x 2.25mm x 0.64mm, 0.4mm Pitch)
    • 22-Pin FCQFN (3mm x 3mm x 0.55mm, 0.4mm Pitch)

Applications/Uses

  • Notebook Computers
  • Sound Bars
  • Tablets

Description

The MAX98374 is a high-efficiency, mono Class D speaker amplifier featuring dynamic headroom tracking (DHT) and brownout protection. As the power-supply voltage varies due to sudden transients and declining battery life, DHT automatically optimizes the headroom available to the Class D amplifier to maintain a consistent listening experience. A wide 5.5V to 16V supply range allows the device to exceed 16W into an 8Ω load.

The flexible digital interface supports either the MIPI SoundWire® compatible interface for audio and control data, or the PCM interface for audio data and a standard I2C interface for control data. The PCM interface supports I2S, left-justified, and TDM audio data formats at 16-, 32-, 44.1-, 48-, 88.2-, and 96kHz sample rates with 16-, 24-, and 32-bit data. In TDM mode, the device can support up to 16 channels of audio data. A unique clocking structure eliminates the need for an external master clock for PCM communication, which reduces pin count and simplifies board layout.

Active emissions limiting (AEL), spread spectrum modulation (SSM), and edge rate control minimize EMI and eliminate the need for the output filtering found in traditional Class D devices.

Thermal foldback protection ensures robust behavior when the thermal limits of the device are reached. When enabled, it automatically reduces the output power when the temperature exceeds a user specified threshold. This allows for uninterrupted music playback even at high ambient temperatures. Traditional thermal protection is also available in addition to robust overcurrent protection.

A flexible brownout-detection engine (BDE) can be programmed to initiate various gain reductions, signal limiting, and clip functions based on supply voltage status. Threshold, hysteresis, and attack/release rates are programmable.

The device is available in a 0.4mm pitch, 25-bump waferlevel package (WLP), or in a 0.4mm pitch, 22-pin FCQFN package. The device operates over the extended -40°C to +85°C temperature range.

Simplified Block Diagram

MAX98374: Simplified Block Diagram MAX98374: Simplified Block Diagramt 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 .