Overview
The A22H165M is a high-performance class-G stereo headphone amplifier designed by STMicroelectronics. It is optimized for high audio performance, high power efficiency, and space-constrained applications such as wearable and fitness devices. The amplifier integrates a low power dissipation amplifier with a high-efficiency buck converter, which adjusts the supply voltage based on the amplitude of the audio signal to optimize power consumption. This design ensures minimal power dissipation and high audio quality.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Power Supply Range | 2.3 V to 4.8 V | V |
| Quiescent Current per Channel | 0.6 mA | mA |
| Current Consumption at 100 µW/channel (10 dB crest factor) | 2.1 mA | mA |
| THD+N at 1 kHz | 0.006% (typical), 0.02% (maximum) | % |
| PSRR at 217 Hz | 100 dB | dB |
| SNR A-weighted at G = 0 dB | 100 dB | dB |
| Package Dimensions | 1.65 mm x 1.65 mm, 400 µm pitch, 16 bumps | mm, µm, bumps |
| Storage Temperature | -65 to +150 °C | °C |
| Maximum Junction Temperature | 150 °C | °C |
Key Features
- I²C interface for volume control with a range from -60 dB to +4 dB
- Independent right and left channel shutdown control
- Integrated high-efficiency buck converter
- Low software standby current: 5 µA max
- No output coupling capacitors required
- Thermal shutdown and short-circuit protection
- Zero pop and click
- Dedicated common-mode sense pin to reduce parasitic ground noise
Applications
- Cellular/smart phones
- Portable media players
- Wearable devices
- Fitness and healthcare devices
Q & A
- What is the power supply range of the A22H165M?
The power supply range is from 2.3 V to 4.8 V.
- What is the quiescent current per channel of the A22H165M?
The quiescent current per channel is 0.6 mA.
- What is the current consumption at 100 µW/channel (10 dB crest factor) for the A22H165M?
The current consumption is 2.1 mA.
- What is the typical THD+N at 1 kHz for the A22H165M?
The typical THD+N at 1 kHz is 0.006%, with a maximum of 0.02%.
- What is the PSRR at 217 Hz for the A22H165M?
The PSRR at 217 Hz is 100 dB.
- Does the A22H165M require output coupling capacitors?
No, the A22H165M does not require output coupling capacitors.
- What kind of protection does the A22H165M have?
The A22H165M has thermal shutdown and short-circuit protection.
- What is the package type and dimensions of the A22H165M?
The A22H165M is packaged in a flip-chip package with dimensions of 1.65 mm x 1.65 mm, 400 µm pitch, and 16 bumps.
- What are the typical applications of the A22H165M?
The typical applications include cellular/smart phones, portable media players, wearable devices, and fitness and healthcare devices.
- How does the I²C interface work on the A22H165M?
The I²C interface allows for volume control with a range from -60 dB to +4 dB.
