ADI has added two MEMS microphones for portable electronics.

ADMP 404 and ADMP405 have an SNR (signal-to-noise ratio) of 62dB, claimed to be the industry’s highest A-weighted figure, and a PSRR (power supply rejection ratio) of 70dBV, also claimed to be highest.

Packaging is 3.35x2.5x0.88mm and reflow-solder-compatible with no sensitivity degradation.

Response is from 100Hz to 15kHz on the ADMP404, and 200Hz to 15kHz on the ADMP405.

"The ADMP405 with a 200 Hz roll-off is the industry’s first with this capability, enabling engineers to filter wind noise or fan noise energy at the transducer; this provides a clearer audio signal that can be more easily conditioned with any downstream signal processing," said the firm.

Both have a built-in particle filter, a MEMS microphone element, an impedance converter, and an output amplifier. Sensitivity is -38dBV.

The 404 complies with the TIA-920 Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones standard.

The 405 is similar, except the 200Hz low-frequency roll-off.

For more information, see http://www.analog.com