The TPA112 MSOP Audio Power Amplifier Evaluation Module

3.2 The TPA112 MSOP Audio Power Amplifier Evaluation Module

The TPA112 MSOP audio power amplifier evaluation module is powered by a TPA112 150-mW stereo audio amplifier IC. It can drive either line-level outputs, 32-Ωheadphones, or 8-Ωspeakers. A single-supply operational amplifier (TLV2211) on the module provides a buffered midpoint voltage to properly bias the noninverting inputs of the TPA112 amplifier IC.

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. TPA112 MSOP EVM

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

Figure 3–3. TPA112 MSOP EVM Schematic Diagram

 

C4

 

 

R7

 

 

 

 

 

 

 

Vo1

 

0.1 ∝

F

 

 

 

8

 

 

 

 

 

20 kΩ

 

1

 

 

 

 

VDD

 

 

 

 

 

Vo1

 

 

 

IN –

 

 

 

 

R8

 

VDD

 

 

 

 

 

 

 

 

+

C6

2.5 to 5.5 V

 

 

 

 

 

 

 

C5

Audio

C1

 

 

 

82 kΩ

2

 

10 ∝

F

1 ∝

F

 

 

 

R1

 

IN 1–

 

 

 

 

GND

Input 1

0.1 ∝

F

 

 

 

 

 

 

20 kΩ

 

3

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

 

 

IN +

 

 

 

 

 

IN 1+

 

 

 

Vo2

 

 

 

 

 

 

Vo2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R2

 

TPA112

R10

 

VDD

 

 

C2

 

R4

82 kΩ

 

MSOP

82 kΩ

 

R5

 

 

0.1 ∝

F

 

 

 

6

 

 

 

IN +

20 kΩ

Mid

4

GND

IN 2–

U2

+

20 kΩ

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

R3

 

 

IN 2+

 

_

C3

 

Audio

 

 

 

 

 

 

Mid

 

C7

 

 

82 kΩ

 

 

 

 

 

R9

 

U1

 

 

 

1 ∝ F

 

Input 2

 

 

 

 

 

 

 

0.1 ∝

F

 

 

 

 

 

 

 

 

 

20 kΩ

 

 

 

 

 

 

 

 

IN –

 

 

 

 

 

 

 

 

 

R6, 20 kΩ

 

 

 

 

 

 

 

 

 

 

 

 

Details

3-3

Page 16 Page 18
Page 17
Image 17
Texas Instruments SLOU023A manual TPA112 Msop Audio Power Amplifier Evaluation Module, TPA112 Msop EVM
Page 16 Page 18

SLOU023A specifications

Texas Instruments SLOU023A is a technical document outlining the features and specifications of the LMH6629, a high-speed, low-noise operational amplifier designed for various analog applications. This op amp is particularly well-suited for precision signal processing, making it a popular choice in industries such as telecommunications, industrial automation, and medical electronics.

One of the main features of the LMH6629 is its high bandwidth. With a gain bandwidth product of 1.5 GHz, it supports a wide range of frequencies, enabling it to process fast-changing signals without significant distortion. This characteristic is critical in applications that require accurate signal amplification and processing, such as RF and video signal conditioning.

In addition to its high bandwidth, the LMH6629 boasts a low noise figure. The device is designed to minimize noise contribution, ensuring high fidelity in signal processing applications. This low noise performance makes it an excellent choice for use in audio processing, medical instruments where signal fidelity is crucial, and sensor applications where precise measurements are required.

Another notable technology utilized in the LMH6629 is its ability to operate at low supply voltages while maintaining high performance. This feature enhances the amplifier's versatility in battery-powered applications, where power efficiency is key. The op amp can operate with supply voltages as low as ±2.5V, making it suitable for modern low-voltage designs.

Furthermore, the LMH6629 provides excellent power supply rejection and common-mode rejection, which are essential for maintaining signal integrity in noisy environments. These characteristics help reduce the impact of power supply variations and external interferences, ensuring reliable operation in diverse application settings.

The package options for the LMH6629 also contribute to its usability. It comes in various forms including surface-mount packages, allowing for easy integration onto PCBs while optimizing space in compact designs.

In summary, Texas Instruments SLOU023A details the impressive features of the LMH6629 operational amplifier, highlighting its high bandwidth, low noise performance, power efficiency, and versatility in various industrial applications. This amplifier stands out as a reliable component for engineers seeking high-performance solutions in analog signal processing.
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