Texas Instruments SLOU023A - Manual (Page 14)

Quick Start List for Stand-Alone
2-4 Quick Start
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA112 MSOP EVM stand-alone or to connect
it into existing circuits or equipment. Connections to the TPA112 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–
IN2+
Vdd GND
IN1+
U2
C7 R9
C1
C5
Vo1
GND
TEXAS
INSTRUMENTS
SLOP126
TPA112 MSOP EVM
C6
R10
R8
R7 C4
R1
R2
R3
R4
C2
R5
R6
C3
JP1
IN1–
+
† Due to the very small size of the MSOP IC package, the standard part number TPA112 is replaced with the code TIAAD
- 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 a differential audio signal source between module pins IN1+ and
IN1– (right channel) and between pins IN2+ and IN2– (left channel). If a
single-ended audio source is used, connect it to IN1– and IN2– (right and
left channels), and ground both IN1+ and IN2+.
5) Connect 32-
Ω
headphones to the module V
O
1, V
O
2 pins through 33
µ
F
to 1000
µ
F output-coupling capacitors (figure 3 – 8) and return to the GND
pin, or
6) For line output, connections to the V
O
1 and V
O
2 pins must be made
through 33
µ
F to 1000
µ
F output-coupling capacitors and returned to
GND.
- Power-up
7) Verify correct voltage and input polarity and set the external power supply
to ON.
The EVM should begin operation.
8) Adjust the signal source level as needed.