AKM has developed ultra-low noise coreless current sensors for improving audio quality of large sized speakers such as subwoofers. The AK310x series is suitable for a system which controls voicecoil motion in speakers (Motional Feedback) by current feedback. This series can be used for controlling industrial motors, since it is certified to UL safety standards.
Features
- Achieving Ultra-Low Noise:
Although conventional current sensors had large noise, the AK310x series reduces the noise extremely to combine with a signal processing IC and an ultra-high sensitivity Hall element. It achieves the world’s best noise performance of –108 dBm/√Hz.
- Ultra-Low Impedance:
The damping factor of the speaker is almost unaffected because the AK310x series can measure the current with a 1.6 mΩ impedance. This series is suitable for motional feedback system.
- Ultra-small Package Certified to Safety Standard:
The AK310x series adopts an ultra-small coreless package, (D/W/H: 7.6 × 7.9 × 1.15 mm). It is certified to IEC/UL60950 and planned to be certified to IEC/UL1577, suitable for various industrial applications such as AC motors and general-purpose inverters.
Main Specifications of the AK310x series
| Product Name | Linear Sensing Range (A) |
Sensitivity (mV/A) |
Output Noise (dBm/√Hz) |
Response Time (μs) |
| AK3101 | ±10.7 | 195 | –102 | 2 |
| AK3102 | ±21 | 100 | –108 | 2 |
| AK3103 | ±35 | 60 | –108 | 2 |
| AK310H | ±42 | 50 | –108 | 2 |
