Datasheet

Quick Start List for Stand-Alone
2-4
Operations
2.3 Quick Start List for Stand-Alone
Follow the steps in this section to use the TPA321 EVM stand-alone or when
connecting it into existing circuits or equipment. Connections to the TPA321
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.
Numbered callouts for selected steps are shown in Figure 2–2 and details
appear in Chapter 3.
Figure 2–2. Quick Start Module Map
5
2
6
4
OUT+
IN–
IN+
VDD GND
U1
†
Shutdown
R5
OUT–
GND
C4
TEXAS
INSTRUMENTS
SLOP341
TPA321 MSOP EVM
C6
C5
S1
R1
+
R2
C2
C1
R3
R4
C3
 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 V
DD
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 positive lead from the audio source to the module IN+ pin and
the negative lead to the IN– pin.
5) Connect the S1 pin to V
DD
through a normally open switch.

6) Select the proper output and perform one of the following:
 For BTL output, connect an 8-Ω–32-Ω speaker to the module OUT+
and OUT– pins.
 For single-ended output, connect a headphone or an 8-Ω–32-Ω
speaker to the module OUT+ and GND pins through a 33 µF to 1000
µF output-coupling capacitor (See Figure 2–4).
 Power Up
7) Verify correct voltage and input polarity and set the external power supply
to ON.
The EVM begins operation.