The TPA122 MSOP Audio Power Amplifier Evaluation Module
3.2.1TPA122 Audio Amplifier IC
The TPA122 audio amplifier IC is a CMOS device intended primarily for high-performance line-level output, headphone driver, and small speaker applications. It is supplied in a very small surface-mount MSOP package and has been designed to operate from low supply voltages (between approximately 2.5 V and 5.5 V) and to deliver up to approximately 150 mW into 8-Ωspeakers with low distortion. As a line-level driver, distortion levels (THD+N) are below 0.07% into 10-kΩloads across the audio band (20 Hz to 20 kHz). As a headphone driver, distortion levels are below 0.4% into 32-Ωloads across the audio band. And as a speaker driver, distortion levels are below 0.8% into 8-Ωloads across the audio band. Typical applications include portable computers, desktop computers, personal audio, toys, games, and similar audio applications.
The IC includes two separate internal amplifiers, depop circuitry, and a common shutdown control (Figure 3±4). The load for each channel is connected between the VO pin and GND through a coupling capacitor. For more information, see the TPA122 amplifier IC data sheet, TI Literature Number SLOS211.
Figure 3±4. TPA122 Amplifier IC
| | | | | | 8 |
Stereo Audio | | RF | | | | |
| | | | | |
Input | RI | | | | | |
| 2 | IN1 | | VO1 | CC |
R | | ± |
| 3 | Bypass | 1 |
CI | | + | | |
| | | | |
| | CB | | | | 4 |
| | | | | |
From System | | 5 | Shutdown | | Bias | |
Control | | | | Control | |
L | RI | 6 | IN2 | ± | VO2 | CC |
| | | 7 |
CI | | | | + | | |
| | RF | | | | |
VDD
CS
RL 
RL
Stereo
