Texas Instruments SLOU023A manual Quick Start List for Stand-Alone, GND Power-up

Quick Start List for Stand-Alone

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

TEXAS	Vdd	GND
INSTRUMENTS	+

IN1– IN1+

R5

R6

			C5
	C4	R7
C1				R8
R1					Vo1
R2
					GND
R3
R4
C2					C6

U2

C3

IN2–

JP1

C7 R9 R10 GND Vo2

IN2+

SLOP126

TPA112 MSOP EVM

† 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-Ωheadphones to the module VO1, VO2 pins through 33 ∝ F to 1000 ∝ F output-coupling capacitors (figure 3 –8) and return to the GND pin, or

6)For line output, connections to the VO1 and VO2 pins must be made through 33 ∝ F to 1000 ∝ 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.

2-4 Quick Start