2 MERUS™ audio amp HAT description
2.1 Features and specifications
The MERUS
TM
audio amp board provides the following features and specifications:
• MERUS
TM
MA12070P multilevel class D amplifier
• Built-in boost converter from 5 V to 20 V to supply the MA12070P device
• Minimum power supply requirements:
− micro USB power supply: 5 V to 2.5 A micro USB (no need for extra high voltage power supplies)
− Battery/power bank: 5 V to 2.1 A 3000 mAh (may vary according to the protection mechanisms of the
battery)
• I
2
S digital audio input
• I
2
C communication for full register map control
• Automatic enable control for booster and amplifier for secure boot-up and shut-down sequences
• Digital limiter for loudspeaker protection
• 2 x bridge tied loaded (BTL) channel default configuration
• Optional 1 x parallel bridge tied loaded (PBTL) configuration for high-power true wireless stereo
applications
2.2 Audio performance
• Output power P-channel (max. instantaneous peak – measured with music): 20 W, RL = 4 Ω
• Output power P-channel (max. average – measured with sine waves): 7 W – THD + N = 0.077 percent, RL = 4
Ω, f = 1 kHz
• THD + N: 0.014 percent – 1 kHz, P
OUT
= 1 W, RL = 4 Ω
• Idle power consumption (HAT only): 390 mW
• Idle power consumption (HAT + Raspberry Pi): 970 mW
• Overall efficiency (1 W/ch at 4 Ω): 66 percent
2.3 Hardware description
2.3.1 Board description and pin functions
Figure 2 shows the board, pin distribution and functions of the MERUS
TM
audio amp HAT. It is shown that the
design is centered on the MA12070P multilevel amplifier, which is supplied from both the TPS61178 built-in
boost converter and the Raspberry Pi 5 V USB power supply. The MA12070P counts with a digital audio
processor with master and independent volume controls per channel and with limiters implemented for device
protection. For detailed information on MA12070P refer to the product datasheet.
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