TPA2012D2 datasheet(13/43 Pages) TI2

13 / 43 page

C Interface

& Control

INL+

INL-

SDA

OUTL+

OUTL-

SDZ

INR+

INR-

SCL

Class-D

Modulator

Volume

Control

Differential

Input Left

C IN

1uF

Differential

Input Right

C IN

1uF

C Interface

IC shutdown

Power

Stage

AGC

Reference

Volume

Control

Power

Stage

OUTR+

OUTR-

AGND

PGND

Bias and

References

AVDD

PVDDR

PVDDL

AGC

Class-D

Modulator

TPA2026D2

www.ti.com

SLOS649B – MARCH 2010 – REVISED MAY 2016

Product Folder Links: TPA2026D2

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9 Detailed Description

9.1 Overview

The TPA2026D2 is a stereo Class-D audio power amplifier capable of driving 750 mW/Ch into 8-

Ω load at 3.6 V

and 3.2 W/Ch into 4-

Ω load at 5 V. The device features independent software shutdown controls for each

channel and also provides thermal and short-circuit protection. In addition to these features, a fast start-up time

and small package size make the TPA2026D2 an ideal choice for cellular handsets, PDAs, and other portable

applications.

9.2 Functional Block Diagram

9.3 Feature Description

9.3.1 Automatic Gain Control

The Automatic Gain Control (AGC) feature provides continuous automatic gain adjustment to the amplifier

through an internal PGA. This feature enhances the perceived audio loudness and at the same time prevents

speaker damage from occurring (Limiter function).

The AGC function attempts to maintain the audio signal gain as selected by the user through the Fixed Gain,

Limiter Level, and Compression Ratio variables. Other advanced features included are Maximum Gain and Noise

Gate Threshold. Table 2 describes the function of each variable in the AGC function.

Table 2. TPA2026D2 AGC Variable Descriptions

VARIABLE

DESCRIPTION

Maximum Gain

The gain at the lower end of the compression region.

Fixed Gain

The normal gain of the device when the AGC is inactive.

The fixed gain is also the initial gain when the device comes out of shutdown mode or when the AGC is

disabled.

Limiter Level

The value that sets the maximum allowed output amplitude.

TPA2012D2 Datasheet(PDF) 13 Page - Texas Instruments

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