Headset

Microphone plays an indispensable role in this kind of devices. Due to extremely limited product size, the MEMS microphone is a key component that determines the call quality.

Its main functions include talking, ANC (Active noise reduction), and ENC ( Environmental noise cancellation)

The ANC function enables the speaker to generate reverse sound waves of external noise. The reverse sound wave will eliminate external noise. Therefore, users can get pure music and clear call quality. ANC function has two modes, Feedforward and Feedback. Feedforward is to receive external noise, and Feedback is receive the effect of noise cancellation. The two modes have different requirements for microphone functions.

The ENC function performs sound processing techniques on the signal captured by the near-end microphone so that the far-end user will not receive any background noise from the near-end side.

Selection guide

•Small package size is suitable for limited product size
•Low current and low power consumption to extend the working time of the headset
•General Talking：Microphones with SNR below 62dB can be used
•ENC： SNR above 60dB can be used, requires phase matching and flat low frequency response
•Feedforward ANC：SNR above 60dB can be used, requires phase matching and flat low frequency response
•Feedback ANC：Requires high SNR 64dB for noise cancellation algorithms, high AOP 128dB for capturing loud noise signals  in the surroundings.

IC Name Description SNR AOP Sensitivity LFRO Dimensions Port Location
3SM123C4T1VA-R Analog 57 dB 123 dB -42±1 dBV 63 Hz 2.75 x 1.85 x 0.95mm Top
3SM122KZT1VA-002-R Analog 64 dB 128 dB -38±1 dBV <20 Hz 2.75 x 1.85 x 1.05mm Top
3SM123HZB1VD-002-R Analog 62 dB 130 dB -38±1 dBV <20 Hz 2.75 x 1.85 x 0.90mm Bottom
3SM122KZB1VD-002-R Analog 64 dB 128 dB -38±1 dBV <20 Hz 2.75 x 1.85 x 0.90mm Bottom
3SM121NZB1HA Analog 67 dB 128 dB -38±1 dBV 10 Hz 3.50 x 2.65 x 0.98mm Bottom
3SM121PZB1UA Analog 68 dB 128 dB -38±1 dBV 10 Hz 3.76 x 3.00 x 1.10mm Bottom
3SM222FMB1VA Digital 60 dB 120 dB -26±1 dBFS <20 Hz 2.75 x 1.85 x 0.90mm Bottom