Texas Instruments TPA721, Руководство пользователя

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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 TPA721 MSOP EVM stand-alone or when
connecting it into existing circuits or equipment. Connections to the TPA721
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. 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
SLOP215
TPA721 MSOP EVM
C6
C5
S1
R1
+
R2
C2
C1
R3
R4
C3
† Due to the very small size of the MSOP IC package, the standard part number TPA721 is replaced with the code TIABC
-
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 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) Connect an 8-
Ω
– 32-
Ω
speaker to the module OUT+ and OUT– pins.
-
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.