Digital I2S outputs added to MEMS microphones

Digital I2S outputs added to MEMS microphones

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By Ally Winning

The bottom port CMM-3526D-261-I2S-TR and top port CMM-4030D-261-I2S-TR are manufactured in small, low profile packages that measure only 3.50 x 2.65 x 0.98 mm and 4.00 x 3.00 x 1.25 mm, respectively. The digital I2S interface get rid of the need for a codec. This also allows the MEMs microphones to connect directly to DSPs and MCUs in end applications. The direct connection makes the devices simple to integrate and saves on components. The digital I2S MEMS microphones are ideal for audio recording and voice capture in space-constrained designs such as smart phones, tablets, smart home devices and wearables.

The two microphones are omnidirectional and have -26 dB sensitivity ratings, operating frequencies from 100 to 10,000 Hz, and current consumption of 400 microamps (µA). The CMM-3526D-261-I2S-TR has a signal-to-noise ratio (SNR) of 64 dBA, while the CMM-4030D-261-I2S-TR offers a SNR of 59 dBA.

The microphones are designed to be reflow solder compatible, providing extra flexibility when surface mount assembly is required. Due to their tight sensitivity tolerances of ±1 dB, both I2S models are also suitable for use in array applications that are used for functions such as beam forming and noise cancellation.

The CMM-3526D-261-I2S-TR and CMM-4030D-261-I2S-TR are available immediately with prices starting at $1.59 per unit at 500 pieces through distribution.

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