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Quick Start List for Stand-Alone
2-4
Quick Start
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA122 MSOP EVM stand-alone or when
connecting it into existing circuits or equipment. Connections to the TPA122
MSOP module header pins can be made via individual sockets,
wire-wrapping, or soldering to the pins, either on the top or the bottom of the
module circuit board (Figure 2–2). Details appear in Chapter 3.
Figure 2–2.
Quick Start Module Map
GND
Vo2
IN2
GND
VDD GND
IN1
GND
R1
C3
R4
S1
Shutdown
C5
Vo1
GND
C2
TEXAS
INSTRUMENTS
SLOP127
TPA122 MSOP EVM
C4
R5
R3
R2
C1
U1
†
+
†
Due to the very small size of the MSOP IC package, the standard part number TPA122 is replaced with the code TIAAE
Power supply
1) Ensure that all external power sources are set to
OFF.
2) Connect an external regulated power supply set to 5 V to the module VDD
and GND pins, taking care to observe marked polarity.
Inputs and outputs
3) Ensure that the signal source level is set to minimum.
4) Connect the audio source to the module IN1, IN2, and GND pins, taking
care to observe marked polarity.
5) Connect the Shutdown pin to V
DD
through a Normally Open switch.
6) Connect 32-Ω headphones to the module V
O
1, V
O
2 pins through 33 µF
to 1000 µF output-coupling capacitors (figure 3–8) and return to the GND
pin, or
7) For line output, connections to the V
O
1 and V
O
2 pins must be made
through 33 µF to 1000 µF output-coupling capacitors and returned to
GND.
Power-up
8) Verify correct voltage and input polarity and set the external power supply
to
ON.
The EVM should begin operation.
9) Adjust the signal source level as needed.