News Release

- New Product Information -

AKM releases the AK4637VN, an Automotive Monaural Audio CODEC for Car Communication Modules and Drive Recorders

Product Name
Product category:
Audio > Audio CODECs > Automotive CODECs
Low Power Audio 24-bit Mono CODEC with Microphone/Speaker Amplifiers, ALC, (Automatic Level Control), and 5-band Equalizer
Automotive Modules, (Data Communication Module), Drive Recorders


Mono audio CODECs, (D/A converter + A/D converter), are widely used in portable AV equipment and IoT devices.  In addition to these applications, the needs for mono audio CODECs in the in-car communication modules and drive recorders are increasing.  Asahi Kasei Microdevices Corporation, (AKM), has released an automotive low-power, 24-bit mono audio CODEC.  The AK4637VN is the automotive version of the AK4637EN, satisfying in-car product qualities such as AEC-Q100.  It achieves great cost/performance by integrating a voice processor, a microphone amplifier, and a regulator.  This is ideal for processing blocks of sound in the in-car communication modules and drive recorders.


● Advanced Recording Function

This device integrates a low-noise/low-power microphone amplifier and microphone power supply to enable high quality, realistic recoding performance.  This is achieved with a, “Wind Noise Reduction Filter”, and, “5-band Notch Filter”, that allows for removal of specific system tones/noises and a, “Digital Automatic Level Control (ALC) Circuit”, to optimize recording levels.

● 1W Output SPK-Amp

The integrated mono speaker amplifier is capable of 1W output power making the AK4637VN ideal for the sound output block of drive recorders.

● Low-power Consumption

The AK4637VN achieves very low-power consumption: 6.5mW in mono recording mode and 11.6mW in speaker playback mode.



Automotive Mono Audio CODEC
Product Name AK4637VN AK4637EN
Sampling Frequency 8 to 48kHz
Mono 24-bit ADC
S/(N+D) 83dB (MIC Gain=18dB)
84dB (MIC Gain=0dB)
S/N 88dB (MIC Gain=18dB)
95dB (MIC Gain=0dB)
Mono 24-bit DAC (Line Output)
S/(N+D) 80dB
S/N 94dB
Other Functions
Speaker Amplifier 1W Monaural Output (Stereo Line Output Switching Function)
Microphone Amplifier Available (Gain Setting in 3dB Step)
Digital MIC Interface Available
Wind Noise Reduction Filter Available
High Performance Digital ALC Available
Equalizer Available (5-band/Notch Filter/Gain Setting during Operation)
PLL with Loop Filter Available (can support variable clocks)
Others BEEP Input Mixing Output Circuit, Sidetone Mixing, Volume Control,
Digital Volume for Output, LDO with High PSRR
Micro-controller Interface I2C
Analog Power Supply (AVDD) 2.8 to 5.5V
Digital Power Supply (DVDD) 1.6 to 1.98V
Digital I/O Power (TVDD) 1.6 or (DVDD-0.2) to 3.6V
Package 20-pin QFN (3 × 3mm, 0.4mm pitch)
Operation Temperature -40 to 85°C
AEC-Q100 Will be Qualified in Mar. 2018 Do not Support
* 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.

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