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Audio > Audio A/D converter
|4-channel 32-bit A/D converter
DR: 105dB, THD+N: -90dB
Sampling Frequency: 8 to 192kHz
Built-in MIC amplifier and MIC power supply
|Conference system, microphone array system, smart speaker, baby or pet monitor, IC recorder|
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.
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.
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.
Multiple AK5704s may be connected in parallel to create a system supporting up to 16 microphones.
The AK5704 supports up to a 192kHz sampling frequency and can be combined with a wideband microphone to achieve ultrasonic band recording.
AK5704ENLow-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)
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|
|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)|