Description

A tiny MEMS microphone block with a PDM digital output. It needs only two signal wires, a clock in and a data line out, so it records sound on any board with a PDM or I2S input. For voice capture, sound level meters and clap switches.

Highlights

• Digital microphone. No amplifier or ADC needed: CLK in, DATA out.
• Two signal wires. Plus 3V3 and GND on a 4-pin right-angle header.
• Filtered supply. A ferrite bead and capacitors clean the microphone's power.
• Channel jumper. A solder jumper selects left or right on a shared line.
• Brick-compatible. Two round holes fit standard building bricks.

In the box

• 1 × PDM Microphone block (TK101), 4-pin right-angle header fitted

Cables and microcontroller are not included.

Specifications

• Microphone: LMD2718T261-OA1 MEMS, PDM output
• Supply: 3.3 V, never 5 V
• Sensitivity: -26 dBFS at 94 dB SPL (datasheet)
• SNR: 58 dB(A) (datasheet)
• Pins: GND, 3V3, CLK, DATA

Works with

ESP32, Raspberry Pi Pico and other 3.3 V boards with a PDM input. Pairs with the TK100 I2S Amplifier and TK103 I2S DAC.