Summary of Wolfson designs first matched MEMS microphones
Wolfson Microelectronics announced the WM7121 (top-port) and WM7132 (bottom-port), their first matched silicon analogue MEMS microphones offering 65 dB SNR, ultra-low distortion, and matched frequency (10 Hz–20 kHz), phase, and sensitivity responses (±1 dB tolerance). Targeted at portable consumer devices for HD audio to complement HD video, the parts use Wolfson CMOS/MEMS membrane technology, tolerate high-temperature flow solder processes, and are sampling now for stereo and other high-fidelity applications.
Parts used in the WM7121 and WM7132 project:
- WM7121 top-port silicon analogue MEMS microphone
- WM7132 bottom-port silicon analogue MEMS microphone
- CMOS/MEMS membrane technology (proprietary to Wolfson)
As well their matching frequency responses, the WM7121 and WM7132 microphones also feature matching phase responses and matching sensitivity, making them ideal for stereo recording and much easier for designers to integrate into their systems. Both devices are also available with market-leading sensitivity tolerance of ±1dB.
Eadaoin Doherty, Wolfson’s Product Line Manager for MEMS Microphones, said: “The WM7121 and WM7132 are among the first microphones in the industry to offer matching frequency responses. This feature, as well as their matching phase responses and sensitivity, ensures that these microphones are easy to integrate and result in truly authentic audio recordings and crystal-clear audio playback.”
The WM7121 top port package and WM7132 bottom port package are both available for sampling now.
Wolfson Microelectronics has introduced its first top and bottom port silicon analogue micro-electro-mechanical systems (MEMS) microphone pair with matching frequency responses.
The Scottish chip supplier is responding to what it sees as a growing demand in the consumer market for high definition audio to match the HD video in mobile devices.
The MEMS microphones have a signal-to-noise ratio (SNR) of 65dB with distortion and matching responses across the frequency band from 10Hz to 20kHz.
As well their matching frequency responses, the WM7121 and WM7132 microphones also feature matching phase responses and matching sensitivity, making them ideal for stereo recording and much easier for designers to integrate into their systems. Both devices are also available with market-leading sensitivity tolerance of ±1dB.
“Matching frequency responses, as well as their matching phase responses and sensitivity, ensures that these microphones are easy to integrate and result in truly authentic audio recordings and crystal-clear audio playback,” said Eadaoin Doherty, Wolfson’s product line manager for MEMS microphones.
For more read: Wolfson designs first matched MEMS microphones
- What are the models released by Wolfson?
The models are WM7121 (top port) and WM7132 (bottom port). - What frequency range do these microphones cover?
They cover 10 Hz to 20 kHz. - What is the signal-to-noise ratio of the microphones?
Both microphones have a signal-to-noise ratio of 65 dB. - Do the microphones have matching responses for stereo use?
Yes, they have matching frequency responses, matching phase responses, and matching sensitivity. - What sensitivity tolerance is available?
They are available with sensitivity tolerance of ±1 dB. - What manufacturing process robustness do they offer?
They are designed to withstand high temperatures associated with automated flow solder assembly processes. - What technology do the microphones incorporate?
They incorporate Wolfson’s proprietary CMOS/MEMS membrane technology. - Are the parts available for sampling?
Yes, both WM7121 and WM7132 are available for sampling now.
