MAX98397

RECOMMENDED FOR NEW DESIGNS

28V Digital Input, Class-DG Amplifier with IV_SENSE, Ultra-Low I_Q, and Brownout Prevention

Data Sheet (Rev. 2) Product Selection Table

Part Models: 2
1ku List Price: Starting From $1.36

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Overview

Wide Input Supply Range (3V to 28V)
Class-DG Operation Enables Industry Leading Quiescent Power
- 21mW at V_PVDD = 20V, V_VBAT = 3.8V
- 25.3mW at V_PVDD = 24V, V_VBAT = 5.0V
Ultra-Low Noise Floor
- 21.5μV_RMS 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, F_SW = 650kHz
Output Power:
- 42W into 8Ω, V_PVDD = 28V, THD+N = 1%
- 26W into 4Ω, V_PVDD = 16V, THD+N = 1%
- 51W into 8Ω, V_PVDD = 28V, THD+N = 10%
100W Peak Output Power into 4Ω, V_PVDD = 28V
Speaker Amplifier Efficiency:
- 83% at 1W into 8Ω, V_PVDD = 24V

93% Peak Efficiency into 8Ω, V_PVDD = 24V
81% at 1W into 4Ω, V_PVDD = 24V
90% Peak Efficiency into 4Ω, V_PVDD = 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)

The MAX98397 is a high-efficiency, mono Class-DG speaker amplifier with industry-leading quiescent power, featuring integrated speaker current and voltage sensing (IV_SENSE), 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 f_S > 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 (I_SENSE) and voltage monitoring (V_SENSE) 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.

Application

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

Part Models: 2
1ku List Price: Starting From $1.36

Documentation

Data Sheet 1

MAX98397: 28V Digital Input, Class-DG Amplifier with IVSENSE, Ultra-Low IQ, and Brownout Prevention Data Sheet (Rev.2) 11/20/2024

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX98397EWB+	35-WLCSP-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX98397EWB+T	35-WLCSP-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

Device Drivers 1

MAX9839x GitHub Linux Driver Source Code

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Tools & Simulations

IBIS Model 1

MAX98397 IBIS Model

Evaluation Kits

Evaluation System for the MAX98397

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Features and Benefits

3V to 28V Dual Supply Operation
USB Audio Streaming (EV System)
I²S, Left-Justified, or TDM Input
Fully Assembled and Tested

Product Details

The MAX98397 evaluation system (EV system) is a fully assembled and tested system that evaluates the MAX98397 Class-D audio amplifier. The EV system consists of the MAX98397 Development board (DEV board), Audio Interface board III (AUDINT3), and a USB cable.

It is recommended that the DEV board be evaluated with the AUDINT3 board, as an EV system.

The MAX98397 supports standard I²S, left-justified, and TDM digital audio interfaces.

The AUDINT3 board provides a USB-to-PCM interface in addition to a 1.8V VDD supply needed to evaluate the DEV board. The MAX98397 DEV board requires two additional supply inputs, 3V to 28V (PVDD) and 3V to 5.5V (VBAT) when evaluating using the AUDINT3 board. Figure 1 details the DEV board.