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MAX98397
28V Digital Input, Class-DG Amplifier with
IV
, Ultra-Low I , and Brownout
SENSE
Q
Prevention
General Description
Applications
The MAX98397 is a high-efficiency, mono Class-DG
speaker amplifier with industry-leading quiescent power,
featuring integrated speaker current and voltage sensing
● Mobile Speakers and Smart Speakers
● Tablets, Laptop and Desktop Computers
● Soundbars
(IV
), a brownout-prevention engine (BPE), and dy-
● Smart IOT
SENSE
namic-headroom tracking (DHT). The device also enables
ultrasound applications by providing support for sample
rates up to 192kHz, a higher passband (for f > 50kHz),
S
and a bypass path for the ultrasound signals through the
amplifier so it is not attenuated by the audio processing.
Benefits and Features
● Wide Input Supply Range (3V to 28V)
● Class-DG Operation Enables Industry Leading
Quiescent Power
Precision output current monitoring (I
) and voltage
SENSE
• 21mW at V
= 20V, V
= 3.8V
= 5.0V
VBAT
PVDD
VBAT
monitoring (V
) enable speaker protection algo-
SENSE
• 25.3mW at V
= 24V, V
PVDD
rithms to be run by a host device. Spread-spectrum modu-
lation (SSM) and edge rate control minimize EMI and elim-
inate the need for the output filtering found in traditional
Class-D devices.
● Ultra-Low Noise Floor
• 21.5μV Output Noise
RMS
• 117.8dB Dynamic Range
● Low Distortion
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 am-
plifier. The Class-DG amplifier switches between the two
supply rails depending on the input signal level and/or the
supply headroom.
• -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
650kHz
=
SW
● Output Power:
• 42W into 8Ω, V
• 26W into 4Ω, V
• 51W into 8Ω, V
= 28V, THD+N = 1%
= 16V, THD+N = 1%
= 28V, THD+N = 10%
PVDD
PVDD
PVDD
For battery-powered applications, the BPE is designed to
help prevent the possibility of a system brownout by re-
ducing the device's contribution to the overall system pow-
er consumption. This is achieved by either attenuating or
limiting the amplifier output when the device supply drops
below a set of programmable BPE thresholds. Additional-
ly, as the power-supply voltage varies due to sudden tran-
sients and declining battery life, DHT automatically opti-
mizes the headroom available to the Class-DG amplifier to
maintain consistent distortion and listening levels.
● 100W Peak Output Power into 4Ω, V
● Speaker Amplifier Efficiency:
= 28V
PVDD
• 83% at 1W into 8Ω, V
• 93% Peak Efficiency into 8Ω, V
• 81% at 1W into 4Ω, V
• 90% Peak Efficiency into 4Ω, V
= 24V
PVDD
= 24V
PVDD
= 24V
PVDD
= 24V
PVDD
● 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
The device provides a PCM interface for audio data and
2
a standard I C interface for control data communication.
2
The PCM interface supports audio playback using I S,
left-justified, and time-division multiplexing audio data for-
mats. A unique clocking structure eliminates the need for
an external system clock (MCLK) for PCM communication,
which reduces pin count and simplifies board layout.
● Flexible Brownout-Prevention Engine
2
2
● I S/16-Channel TDM and I C Digital Interfaces
● Playback Support for 16-, 24-, and 32-Bit Data Words
● Playback and IV Paths Support Sample Rates up to
192kHz
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.
● 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 device is available in a 0.4mm pitch, 35-bump wafer-
level package (WLP). The device operates over the ex-
tended -40°C to +85°C temperature range.
Ordering Information appears at end of data sheet.
19-101757; Rev 0; 10/23
SMBus is a trademark of Intel Corp.
© 2023 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A. | Tel: 781.329.4700 | © 2023 Analog Devices, Inc. All rights reserved.
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