Texas Instruments TPA721, User Manual

Page: 9 / 27

Description
1-3 Introduction
1.2 Description
The TPA721 MSOP audio power amplifier evaluation module is a complete,
low-power single-channel audio power amplifier. It consists of the TI TPA721
700-mW low-voltage audio power amplifier IC in a very small MSOP package,
along with a small number of other parts mounted on a circuit board that is
approximately one and a quarter inches square (Figure 1–1).
Figure 1–1. The TI TPA721 Audio Amplifier Evaluation Module
OUT+
IN–
GND
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.
Single in-line header pins are mounted to the underside of the module circuit
board to allow the EVM to be plugged into the TI plug-n-play audio amplifier
evaluation platform or to be wired directly into existing circuits and equipment
when used stand-alone.
The platform, with room for a pair of TPA721 MSOP evaluation modules, is a
convenient vehicle for demonstrating TI’s audio power amplifier and related
evaluation modules. The EVMs simply plug into the platform, which
automatically provides power to the modules, interconnects them correctly,
and connects them to a versatile array of standard audio input and output jacks
and connectors. Easy-to-use configuration controls allow the platform and
EVMs to quickly model many possible end-equipment configurations.
There is nothing to build, nothing to solder, and nothing but the speakers
included with the platform to hook up.
1.3 TPA721 EVM Specifications
Supply voltage range, V
DD
2.5 V to 5.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply current, I
DD
450 mA, max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output power, P
O
: 8-
Ω
BTL, V
DD
= 5 V 700 mW . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio input voltage, V
I
2 Vpp, max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum load impedance, R
L
8
Ω
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .