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The TPA122 MSOP Audio Power Amplifier Evaluation Module
3-4
Details
3.2.1 TPA122 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-Ω speakers with low distortion. As a line-level driver, distortion levels
(THD+N) are below 0.07% into 10-kΩ loads across the audio band (20 Hz to
20 kHz). As a headphone driver, distortion levels are below 0.4% into 32-Ω
loads across the audio band. And as a speaker driver, distortion levels are
below 0.8% into 8-Ω loads 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 V
O
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
Stereo
R
L
R
L
C
C
C
C
V
O
1
V
O
2
Bypass
IN2
IN1
C
B
R
F
R
F
R
I
R
I
C
I
C
I
R
L
Stereo Audio
Input
Bias
Control
From System
Control
C
S
V
DD
6
3
5
1
2
8
7
–
–
+
+
Shutdown
4