24-bit Audio ADC with Preamplifiers Supports 4-Channel Microphone Array Applications

Tokyo Japan, Aug 7, 2013, Asahi Kasei Microdevices Corporation (AKM) today launched the AK5703, a 24-bit 4-channel ADC for multi-channel audio recording. This new device is an enhanced version of the AK5702, which is widely-used in gaming machines, PCs and audio/video conference systems. The new high performance and low power consumption device: the AK5703 reduces power consumption to 9mA while achieving 96dB  SNR and 85dB S/(N+D). It integrates a low-noise microphone preamplifier capable of differential or single-ended input operation, a condenser microphone power supply, and AKM’s unique ALC circuit for high-quality multi-channel microphone recordings. The audio data port supports DSP mode in addition to standard formats such as MSB justified and I²S. A TDM output mode is also supported, which allows cascading connections for two devices. It simplifies the interface between the DSP and the microphone system with up to eight channels, making the AK5703 ideal for a beam-forming microphone array. A microphone sensitivity compensation function and a delay circuit for output data are newly integrated, enabling fine tuning of each microphone.


The AK5703’s integrated PLL includes a loop filter, which used to be required externally, operates from a system clock frequency (such as USB and video) so the clock required for audio playback can be generated internally. The microprocessor interface supports both a three-wire and I2C bus interfaces. The operating voltage ranges from 2.4 to 3.6V for the analog block, from 1.6 to 3.6V for the digital interface and from 1.6 to 1.98V for the digital block. The AK5703 is available in a space-saving (4mm x 4mm) 28-pin QFN package.


Evaluation boards and samples are available now.  

To obtain more information abput the AK5703, please visit here.




About “Audio 2 Go (TM)

Audio 2 Go(TM) products are designed for portable audio applications, including mobile phones and media players, which provide feature-rich, single chip solution with low power consumption and high audio fidelity.


[Note] AKM and Audio 2 Go are trademarks of Asahi Kasei Microdevices Corporation.