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Audio Amplifier

TFA9875: Highly Power Efficient Class-D Audio Amplifier

Overview

The TFA9875 is a high efficiency boosted class-D audio amplifier. It can deliver up to 7.7 Wrms output power into an 8 Ω speaker. The device supports dual voice coil speaker protection by sensing the speaker current and the voltage over each voice coil (dual voltage sense). The internal adaptive DC-to-DC converter raises the supply voltage up to 12 V, providing ample headroom for major improvements in sound quality.

Features

  • High output power: 7.7 W (average) into 8 Ω at 4.2 V supply voltage (THD = 1 %)

  • Supports handset and hands-free speaker configurations

  • Low noise: 10 μV mode in handset speaker configuration

  • High efficiency, low power dissipation speaker driver

  • Supports dual coil speaker protection, speaker current and two voltage sense circuitries integrated

  • Adaptive DC-to-DC converter increases the supply voltage smoothly when switching between fixed boost and adaptive boost modes, preventing that large battery supply spikes and limiting quiescent power consumption occur

  • Suppresses acoustical noise of the boost converter decoupling capacitor when the adaptive DC-to-DC converter is active

  • Wide supply voltage range (fully operational from 2.7 V to 5.5 V)

  • I²C-bus control interface (400 kHz)

  • TDM audio interface

  • 16 kHz/32 kHz/44.1 kHz/48 kHz/96 kHz sample frequencies supported

  • Programmable interrupt control via a dedicated interrupt pin

  • Low RF susceptibility

  • Overtemperature protection

  • 8 kV system-level ESD protection without external components on amplifier output

System Block Diagram

Application Block Diagram

Datasheets

Title
ID
Version
Date
Type
  • TFA9875 SDS
    DS-VAA-00066-EN
    Rev.1.0
    2021-12-14

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