Texas Instruments SLOU025 ±2. TPA122 MSOP EVM, ±3. TPA122 MSOP EVM Schematic Diagram, Details

The TPA122 MSOP Audio Power Amplifier Evaluation Module

3.2 The TPA122 MSOP Audio Power Amplifier Evaluation Module

The TPA122 MSOP Audio Power Amplifier Evaluation Module is powered by a TPA122 150-mW Stereo Audio Amplifier IC. It includes a shutdown control signal input with onboard switch and can drive either line-level outputs, 32-Ωheadphones, or 8-Ωspeakers.

The evaluation module can be used with the TI Plug-N-Play Audio Amplifier Evaluation Platform (Figure 3±1) or wired directly into circuits or equipment. The module has single in-line header connector pins mounted to the under side of the board. These pins allow the module to be plugged into the TI platform, which automatically makes all the signal input and output, power, and control connections to the module.

The module connection pins are on 0.1-inch centers to allow easy use with standard perf board and plug board-based prototyping systems. Or, the EVM can be wired directly into existing circuits and equipment when used stand-alone.

The module appears in Figure 3±2 and its schematic is shown in Figure 3±3.

Figure 3±2. TPA122 MSOP EVM

Shutdown		VDD	GND
	S1	+
	R1	C5
IN1		R2
GND	C1	R3
			Vo1
	C2	U1²	GND
TEXAS
INSTRUMENTS			C4
	C3	R5
		R4	GND
IN2	SLOP127		Vo2
GND
	TPA122 MSOP EVM

²Due to the very small size of the MSOP IC package, the standard part number TPA122 is replaced with the code TIAAE

Figure 3±3. TPA122 MSOP EVM Schematic Diagram

Shutdown

(VDD to

Shutdown)

Audio Input 1

Audio Input 2

	R1								Vo1
					8
NO	20 kΩ	1	Vo1	VDD					VDD
S1
					C5		+	C4	2.5 to 5.5 V
	R3
VDD				TPA122	10	μ	F	1 μF
	80 kΩ
		2		MSOP					GND
			IN 1		7
				Vo2
	R2
C1		3
	20 kΩ
1 μF			Bypass
	C2			IN 2	6				Vo2
	1 μF
							R5
		4			5
C3			GND	Shutdown			80 kΩ
	R4
1 μF
	20 kΩ
								Details	3-3