Analogue, Mixed Signal, LSI


MEMS microphones

26 May 2010 Analogue, Mixed Signal, LSI

Analog Devices has created two new MEMS microphones that enable advanced audio functions for portable electronics.

These functions include high-fidelity audio/video playback, hands free communication, voice recognition with built-in wind noise suppression, and TIA-920 compliance for VoIP applications.

The new ADMP 404 and ADMP405 iMEMS microphones offer SNR (signal-to-noise ratio) of 62 dB A-weighted and PSRR (power supply rejection ratio) of 70 dBV with integrated high-pass filtering. The devices are available in a small and thin 3,35 × 2,50 × 0,88 mm surface-mount package that is reflow solder compatible with no sensitivity degradation.

Delivering a flat wideband frequency response from 100 Hz to 15 kHz on the ADMP404 and from 200 Hz to 15 kHz on the ADMP405, these microphones eliminate the need for hardware filtering or advanced signal processing to enhance audio acquisition. The ADMP405’s 200 Hz roll-off enables 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.

The ADMP404 consists of a MEMS microphone element, an impedance converter and an output amplifier. Its sensitivity of -38 dBV makes it a suitable choice for both near-field and far-field applications. Low power consumption enables long battery life for portable applications. A built-in particle filter provides high reliability. The ADMP404 complies with the TIA-920 ‘Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones’ standard.



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Highly accurate digital temperature sensor
25 November 2019, Altron Arrow , Analogue, Mixed Signal, LSI
STMicroelectronics’ STTS22H is an ultra-low-power, high-accuracy digital temperature sensor offering optimised performance over the entire operating temperature range of -40°C to +125°C, and with accuracy ...

Read more...
Tiny buck-boost converters
25 November 2019, Avnet South Africa , Power Electronics / Power Management
Texas Instruments introduced a family of four high-efficiency, low-quiescent-current (IQ) buck-boost converters that feature tiny packaging with minimal external components for a small solution size. ...

Read more...
Isolated SiC gate driver
25 November 2019, CST Electronics , Analogue, Mixed Signal, LSI
With the MAX22701E isolated gate driver from Maxim Integrated Products, designers of high-voltage/high-power systems can improve power supply efficiency, reducing power loss and the resulting carbon footprint. ...

Read more...
High-voltage precision op-amp
25 November 2019, Altron Arrow , Analogue, Mixed Signal, LSI
The ADHV4702-1 is a high-voltage (220 V), unity-gain, stable precision operational amplifier. The next generation of proprietary semiconductor processes and innovative architecture from Analog Devices ...

Read more...
Ultra-small LDO linear regulator
25 November 2019, Avnet South Africa , Power Electronics / Power Management
Texas Instruments introduced an ultra-low-power low-dropout (LDO) linear voltage regulator with what it claims is the industry’s lowest quiescent current (IQ) of sub-25 nA. The new regulator features ...

Read more...
Radiation-tolerant PolarFire FPGA
23 October 2019, Avnet South Africa , Programmable Logic
Developers of spacecraft electronics use radiation-tolerant (RT) field programmable gate arrays (FPGAs) to create on-board systems that meet the demanding performance needs of future space missions, survive ...

Read more...
Absolute pressure sensor
23 October 2019 , Analogue, Mixed Signal, LSI
Würth Elektronik has developed a very compact MEMS-based (micro electro-mechanical system) absolute pressure sensor: the 2,0 x 2,0 x 0,8 mm sized WSEN-PADS measures pressure in the range between 26 and ...

Read more...
Radiation-tolerant PolarFire FPGA
25 November 2019, Avnet South Africa , Programmable Logic
Developers of spacecraft electronics use radiation-tolerant (RT) field programmable gate arrays (FPGAs) to create on-board systems that meet the demanding performance needs of future space missions, survive ...

Read more...
Design considerations for powering remote Bluetooth beacons
25 November 2019, Avnet South Africa , Power Electronics / Power Management, Editor's Choice
One of the most exciting low-power wireless technologies to emerge in the last couple of years is Bluetooth beacon technology, which involves placing small electronic beacon devices at points of interest that broadcast packets of information via Bluetooth low energy to the smartphones of passers-by.

Read more...
Bluetooth 5.0 audio IC and module
25 November 2019, Avnet South Africa , Telecoms, Datacoms, Wireless, IoT
To help Bluetooth speaker and headphone manufacturers maintain product differentiation in the competitive wireless audio market, Microchip Technology released the next generation of its Bluetooth 5.0-qualified ...

Read more...