The HT97220 is a stereo line‑driver/headphone amplifier delivering up to 125 mW into 32 Ω loads, supporting 5 V and 3.3 V supplies with low THD+N and high SNR.
The HT97220 is a differential‑input, fully‑differential output audio IC that can drive headphones or line‑level loads without output coupling capacitors. It operates from 2.5 V to 5.5 V, provides a fixed 6 dB gain or an externally adjustable gain, and offers low distortion (THD+N < 90 dB) and high signal‑to‑noise ratio (up to 112 dB).
Typical applications include Bluetooth headsets, smartphones, audio equipment, DVD players, tablets, set‑top boxes and portable game consoles. The device is supplied in a 3 mm × 3 mm QFN16 package and includes pin definitions, schematic and PCB layout diagrams for easy integration. This manual is written in Chinese.
| Output Power (32 Ω, 5 V) | 125 mW |
|---|---|
| Output Voltage (1 kΩ, 5 V) | 3 VRMS |
| Output Voltage (600 Ω, 3.3 V) | 2 VRMS |
| Supply Voltage Range | 2.5 V–5.5 V |
| THD+N | < 90 dB |
| Signal‑to‑Noise Ratio | up to 112 dB |
| Fixed Gain | 6 dB |
| Package | QFN16 3 mm × 3 mm |
It can deliver up to 125 mW into a 32 Ω load when powered from 5 V.
The device operates from 2.5 V up to 5.5 V.
It has a 6 dB internal fixed gain and also allows external gain adjustment via resistors.
The IC is packaged in a 3 mm × 3 mm QFN16 package.