1.What types of products is the M216A4 suitable for?
Mainly targeted at scenarios requiring clear amplification and voice playback, such as megaphones, loudspeakers, vehicle/emergency broadcasting, and portable voice announcement devices.
Megaphone
A megaphone (also known as a handheld bullhorn), commonly referred to as a loudspeaker, is a portable voice amplification device. It captures human voice via a microphone, processes it through audio chip algorithms, and drives a speaker to amplify the sound for long-distance voice transmission.
Features
Professional megaphone chipOn-chip recording up to 120 seconds48KHz full chainLoop playback of recordingsAlarm/siren modeUSB/TF card music playbackMulti-level volume adjustmentBuilt-in Class-D amplifierSupports OTA repeated upgrade via USB flash drive
Key Parameters
Main IC
M216A4
Package
SOP16
CPU Architecture
32-bit Dual-Issue DSP, 240MHz
On-chip SRAM
52KB SRAM (20KB shared cache)
ADC Sampling Rate
8kHz～48kHz, support 48K high-definition megaphone & recording
Audio Channel
1×ADC, 1×DAC(8~96kHz), Built-in Class-D Amp
Built-in Amplifier
500mW @4Ω (Support external power amp)
Audio SNR
ADC/DAC SNR ≥96dB
Recording Function
On-chip recording, up to 120 seconds, support 48K high-definition recording
Audio Algorithm
Noise reduction for megaphone & recording, DSP anti-howling
Audio Format
MP3, WAV
Storage Media
TF Card, SPI Flash, USB Disk
Main Functions
48K high-definition megaphone, megaphone speaking, DSP anti-howling, record & loop playback, alarm tone, audio playback, multi-language voice prompt
Operating Voltage
1.8V~5.5V
Low Power
Soft-off current ＜3μA
Operating Temp.
-20℃ ~ +85℃
Applications
Handheld megaphone, loudspeaker, voice prompt device, recording speaker
FAQ
2.Which audio formats and storage methods are supported?
Supports MP3 and WAV format decoding and playback; can read from three storage media: TF card, SPI Flash, and USB.
3.How to use the internal recording function? How long can it record?
The chip features a built-in recording function, with a maximum internal recording time of 100 seconds per chip. It can record and loop playback commonly used broadcast content without requiring external storage.
4.Is it possible to use external memory if the required time exceeds 100 seconds?
Yes, the chip automatically mounts external memory upon power-up, with external priority over internal.
5.How to access development resources and technical support?
Please contact us to obtain datasheets, reference designs, and technical support to help you quickly complete product development.
6.How is the power consumption and battery life performance?
Low-power design, optimized for battery-powered portable devices, effectively extends overall battery life.