INMP441 – High Performance Digital MEMS Microphone
The INMP441 is a high-performance, low-power, digital output, omnidirectional MEMS microphone with a bottom port. Designed to deliver exceptional audio quality, it integrates various components including a MEMS sensor, signal conditioning, analog to digital converter, anti-aliasing filter, and power management, all accessible through the industry-standard 24-bit I2S interface. This innovative integration simplifies connectivity, allowing direct interfacing with digital processors such as DSPs and microcontrollers, eliminating the need for an additional audio codec.
Features:
| Feature | Description |
|---|---|
| Digital I2S interface with high precision 24-bit data | Seamless integration with digital processors for efficient data transfer |
| High signal to noise ratio: 61 dBA | Ensures clear audio transmission |
| High sensitivity: -26 dBFS | Delivers excellent performance in capturing audio |
| Stable frequency response from 60 Hz to 15 kHz | Consistent audio quality across a wide frequency range |
| Low power consumption: 1.4 mA | Energy-efficient design for prolonged usage |
| High PSR (Power Supply Rejection): -75 dBFS | Minimizes interference for cleaner audio output |
Specifications:
| Interface Definitions | Description |
|---|---|
| SCK | Serial data clock for I2S interface |
| WS | Serial data word selection for I2S interface |
| L/R | Left/Right channel selection |
| Low: Microphone outputs a signal on the left channel of the I2S frame | |
| High: Microphone outputs signals on the right channel of the I2S frame | |
| SD | Serial data output of the I2S interface |
| VCC | Input power, 1.8V to 3.3V |
| GND | Power ground |
Connection to ESP32:
| INMP441 | ESP32 |
|---|---|
| SCK | GPIO14 |
| SD | GPIO32 |
| WS | GPIO15 |
| L/R | GND |
| GND | GND |
| VDD | VDD3.3 |
Unleash your creativity and transform your audio projects into reality with the INMP441. Whether you’re working on IoT devices, voice recognition systems, or any other audio-enabled application, the INMP441 offers the performance and flexibility you need to achieve outstanding results.
