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

2019-06-11 | Return

Product Name：AK5704EN
Category：Audio > Audio A/D converter

Title：
4-channel 32-bit A/D converter
DR, SNR: 105dB, THD+N: -90dB
Sampling Frequency: 8 to 192kHz
Built-in MIC amplifier and MIC power supply

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

Description
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.

Features
- 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.

Main Specifications

AK5704EN Low-power 4-ch 32-bit A/D converter with MIC amplifier
ADC	4-channel 32-bit A/D converter Digital Filter: 2 types (Short Delay Sharp Roll-off, Voice) SNR, DR: 105dB, THD+N: -90dB
Sampling Frequency	8 to 192kHz
MIC Amplifier	Single-ended or full-differential inputs 0 to +30dB, 3dB step
MIC Power Supply	2 outputs 2.8V/2.5V/1.8V/AVDD Direct
Programmable Phase Adjustment	Available
Microphone Sensitivity Adjustment	Available
Digital Voice Activity Detector	Available
Programmable Digital Filter	Mixer, 2nd order HPF and LPF, Automatic Level Control
Digital Audio interface	I2S, MSB-justified, PCM Short/Long, Cascade TDM
PLL	Available
Control I/F	I2C (400kHz)
Power Supply	AVDD = 1.7 to 1.9V or 3.0 to 3.6V TVDD = 1.65 to 3.6V
Power Consumption	9.7mW (2-ch ADC, AVDD=3.3V, fs-48kHz, Slave mode) 17.0mW (4-ch ADC, AVDD=3.3V, fs-48kHz, Slave mode) 2.7mW (VAD, AVDD=1.8V, fs-16kHz, Slave mode)
Operation Temperature	-40 to 85℃
Package	28-pin QFN (4mm x 4mm, 0.4mm pitch)

[Notes]
* Information on this page is current on the date of press release.
* AKM and VELVET SOUND™ are trademarks 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.

source：http://www.akm.com