1. Products
  2. Audio Products
  3. Audio Amplifiers
  4. Speaker Amplifiers
  5. Class DG
  6. MAX98397


Features and Benefits

  • Wide Input Supply Range (3V to 28V)
  • Class-DG Operation Enables Industry Leading Quiescent Power
    • 21mW at VPVDD = 20V, VVBAT = 3.8V
    • 25.3mW at VPVDD = 24V, VVBAT = 5.0V
  • Ultra-Low Noise Floor
    • 21.5μVRMS Output Noise
    • 117.8dB Dynamic Range
  • Low Distortion
    • -85dB THD+N at 3W into 8Ω, f = 1kHz
    • -85dB THD+N at 6W into 4Ω, f = 1kHz
    • -80dB THD+N at 1W into 8Ω, f = 6kHz, FSW = 650kHz
  • Output Power:
    • 42W into 8Ω, VPVDD = 28V, THD+N = 1%
    • 26W into 4Ω, VPVDD = 16V, THD+N = 1%
    • 51W into 8Ω, VPVDD = 28V, THD+N = 10%
  • 100W Peak Output Power into 4Ω, VPVDD = 28V
  • Speaker Amplifier Efficiency:
    • 83% at 1W into 8Ω, VPVDD = 24V
    • 93% Peak Efficiency into 8Ω, VPVDD = 24V
    • 81% at 1W into 4Ω, VPVDD = 24V
    • 90% Peak Efficiency into 4Ω, VPVDD = 24V
  • Class-D EMI Reduction Enables Filterless Operation
  • Spread-Spectrum Modulation and Switching-Edge Rate Control
  • Integrated Speaker Current and Voltage Sense Do Not Require External Components
  • Flexible Brownout-Prevention Engine
  • I2S/16-Channel TDM and I2C Digital Interfaces
  • Playback Support for 16-, 24-, and 32-Bit Data Words
  • Playback and IV Paths Support Sample Rates up to 192kHz
  • Audio Processing Bypass Path
  • Dynamic Headroom Tracking (DHT) Maintains a Consistent Listening Experience
  • Extensive Click-and-Pop Suppression
  • 35-Bump WLP (0.4mm Pitch)

Product Details

The MAX98397 is a high-efficiency, mono Class-DG speaker amplifier with industry-leading quiescent power, featuring integrated speaker current and voltage sensing (IVSENSE), a brownout-prevention engine (BPE), and dynamic-headroom tracking (DHT). The device also enables ultrasound applications by providing support for sample rates up to 192kHz, a higher passband (for fS > 50kHz), and a bypass path for the ultrasound signals through the amplifier so it is not attenuated by the audio processing. Precision output current monitoring (ISENSE) and voltage monitoring (VSENSE) enable speaker protection algorithms to be run by a host device. Spread-spectrum modulation (SSM) and edge rate control minimize EMI and eliminate the need for the output filtering found in traditional Class-D devices.

To achieve industry-leading quiescent power, the Class-DG architecture employs two supply rails; VBAT (3V to 5.5V) and PVDD (3V to 28V) to supply the speaker amplifier. The Class-DG amplifier switches between the two supply rails depending on the input signal level and/or the supply headroom.

For battery-powered applications, the BPE is designed to help prevent the possibility of a system brownout by reducing the device's contribution to the overall system power consumption. This is achieved by either attenuating or limiting the amplifier output when the device supply drops below a set of programmable BPE thresholds. Additionally, as the power-supply voltage varies due to sudden transients and declining battery life, DHT automatically optimizes the headroom available to the Class-DG amplifier to maintain consistent distortion and listening levels.

The device provides a PCM interface for audio data and a standard I2C interface for control data communication. The PCM interface supports audio playback using I2S, left-justified, and time-division multiplexing audio data formats. A unique clocking structure eliminates the need for an external system clock (MCLK) for PCM communication, which reduces pin count and simplifies board layout.

Thermal foldback, when enabled, 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.

The device is available in a 0.4mm pitch, 35-bump wafer-level package (WLP). The device operates over the extended -40°C to +85°C temperature range.


  • Mobile Speakers and Smart Speakers
  • Tablets, Laptop and Desktop Computers
  • Soundbars
  • Smart IOT

Product Categories

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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

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Design Resources

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.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX98397EWB+ Material Declaration Reliability Data 35-WLCSP-N/A
MAX98397EWB+T Material Declaration Reliability Data 35-WLCSP-N/A
Wafer Fabrication Data

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.