ꢁ×ꢆꢂ W, ꢀꢂ.ꢄ to ꢁꢆ V, Ultra‑Low Idle Power, MERUS™ Multilevel Switching
Class‑D Audio Amplifier with Integrated DSP and Inductor‑Less Operation
MAꢁꢂꢅꢆDNS
ꢀ FEATURES
ꢂ DESCRIPTION
MERUS™ multilevel switching technology
The MAꢂꢄꢇꢈDNS is a ꢂ×ꢈꢄ W audio amplifier with inte‑
grated audio DSP and IꢂS/TDM audio interface. It features
the MERUS™ multilevel switching amplifier technology en‑
abling unmatched power eꢅiciency at both low and high
output power. Multilevel switching also relaxes EMI and
enables inductor‑less applications with lower cost and no
compromise in audio performance or eꢅiciency. A high or‑
derinternalfeedbackloopensureslowTHDforexcellentau‑
dio performance. The integrated DSP oꢅers a configurable
processing flow and can be used to correct and tune real
speaker applications with equalization, limiting and more.
The ultra‑low idle power consumption is at least five times
lower than the traditional class D audio amplifiers, making
MAꢂꢄꢇꢈDNS ideal for battery powered speaker applications
with extended battery life and reduced battery cell cost. In
mains‑powered applications, the reduced and scalable EMI
performance, enables otherwise impossible industrial de‑
signs, without the necessity for a heatsink or an LC filter.
• ꢀ‑level voltage modulation for ultra‑low idle power con‑
sumption: ꢁꢀꢀ mW @ ꢂꢃ PVDD without the need of com‑
plex dynamic rail‑tracking systems
• Inductor‑less application for reduced system cost without
output power limitations
• Reduced EMI emissions compared to traditional ꢂ and ꢄ
level class D audio amplifiers for fast time to market with‑
out compromises in audio performance or eꢅiciency
• High eꢅiciency at low output power: ꢆꢇ %, ꢂ×ꢁ.ꢀ W, ꢆ Ω
for extended battery life and easy thermal management
in multichannel products even in idle state
Flexible configuration and application
• BTL rated output: ꢂ×ꢈꢄ W, ꢂꢃ V, ꢃ Ω, ꢁꢇ% THD
• PBTL rated output: ꢁ×ꢁꢂꢀ W, ꢂꢃ V, ꢂ Ω, ꢁꢇ% THD
• PVDD voltage range (audio playback): ꢁꢄ.ꢀ V to ꢂꢈ V
• PVDD voltage range (communication): ꢈ.ꢈꢀ V to ꢂꢈ V
• High eꢅiciency at low output power: ꢆꢇ %, ꢂ×ꢁ.ꢀ W, ꢆ Ω
• Short circuit protection: ꢆ A peak (BTL) / ꢁꢈ A peak (PBTL)
• External closed‑loop feedback for improved THD
ꢃ PRODUCT VALIDATION
Qualification standard: Standard
ꢄ TYPICAL APPLICATION
• Integrated DSP with configurable biquads, limiters, vol‑
ume control and more
1.8/3.3V
EMC ferrite
filter
PVDD
VDD
FB0A
OUT0A
VDDIO
MSEL
PVDD
• Easy configuration over IꢂC‑bus with up to ꢈꢃ devices
Audio source
I2S/TDM data
CH1
• ꢆ‑bit auxiliary ADC for internal temp. / PVDD monitoring
or sampling from external sources
I2S_DI
I2S_SCK
I2S_WS
• Configurable switching edge steepness and inter‑chip
PWM sync for multi‑device systems
FB0B
OUT0B
FB1A
Audio sink
I2S/TDM data
I2S_DO
• No external heatsink required
I2C_SCL
I2C_SDA
NMUTE
ENABLE
NERR
OUT1A
CH2
Audio performance
HOST/MCU
• Output noise: ꢈꢃ μVrms (A‑weighted)
• Dynamic range: ꢁꢇꢈ dB (A‑weighted)
• THD+N: ꢇ.ꢇꢃꢀ%, ꢁ W, ꢁ kHz
NCLIP
FB1B
I2C_AD0
I2C_AD1 OUT1B
Set address: 0x20
Audio I/O
Efficiency VS output power
100
90
80
70
60
50
40
30
20
10
• ꢄ‑wire digital audio interface (no MCLK required)
• ꢄꢂ, ꢃꢃ.ꢁ, ꢃꢆ, ꢆꢆ.ꢂ, ꢉꢈ, ꢁꢊꢈ.ꢃ, ꢁꢉꢂ kHz sample rates
• IꢂS and TDM formats supported
• Low input‑to‑output latency for echo cancellation
• Post‑DSP IꢂS output for chaining / echo cancellation
ꢁ TARGET APPLICATIONS
PVDD=18V
• Battery powered speakers
Load=8 +22µH
• Bluetooth/wireless/smart speakers and soundbars
• Conference speakers
Traditional class D
• Multichannel/multi‑room audio systems
0.1
1
4
10
20
Output power [W]
Datasheet
www.infineon.com
Please read the Important Notice and Warnings at the end of this document
page ꢁ of ꢃꢊ
INTVꢄ.ꢇ.ꢊ
January, ꢂꢇꢂꢃ
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