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[Notes] * Information on this page is current on the date of press release. * AKM is trademark of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States. * Appellations, company names and product names on this page are trademarks or registered trademarks of respective companies.


AKM develops a high-quality low-power 4-ch A/D converter for multi-microphone recording



Asahi Kasei Microdevices Corporation (AKM) has developed a low-power 4-channel 32-bit A/D converter (ADC) with integrated low-noise microphone amplifiers. It includes digital signal processing blocks, such as filtering and level control, that are required for a digital microphone input.

Mass production of the AK5704 is scheduled for September 2019.



Superior low-noise recording with low power consumption

The 32-bit AK5704 achieves a dynamic range of 105dB and -90dB THD+N, enabling products to take advantage of the full performance of high-SNR microphones. It is ideal for high-resolution recordings, as well as applications requiring excellent far-field response over 5m. The AK5704 is also extremely power-efficient, consuming only 17mW in active mode.

VAD feature further reduces system power consumption

The AK5704 incorporates a new Voice Activity Detector (VAD). Using the VAD as a boot trigger can significantly reduce system power consumption, as the rest of the device may be powered off while the VAD consumes only 2.7mW while waiting for a wake-word.

Supports Multiple Parallel Connections

Multiple AK5704s may be connected in parallel to create a system supporting up to 16 microphones.

Supports Ultrasonic Recording

The AK5704 supports up to a 192kHz sampling frequency and can be combined with a wideband microphone to achieve ultrasonic band recording.


Conference system, microphone array system, smart speaker, baby or pet monitor, IC recorder