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Home > NEWEST Products > New by Manufacturer > NXP Semiconductors > TFA9894 High-Efficiency Class-D Audio Amplifiers - NXP Semiconductors
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NXP Semiconductors TFA9894 High-Efficiency Class-D Audio Amplifiers

NXP Semiconductors TFA9894 High-Efficiency Class-D Audio Amplifiers offer a sophisticated SpeakerBoost and Protection algorithm. The TFA9894 amplifiers feature up to 5.6W (AVG) output power into an 8Ω speaker and up to 6.2W (AVG) output power into a 4Ω speaker, at a battery supply voltage of 4.0V. The internal adaptive DC-to-DC converters provide ample headroom for major improvements in sound quality with a raised power supply voltage up to 10V.

Several safety protections are offered to allow the speaker to operate under all conditions. The TFA9894 increases acoustic output while monitoring membrane displacement and voice coil temperature making sure they do not exceed their rated limits. In addition, advanced signal processing ensures that the quality of the audio signal is never degraded by unwanted clipping or distortion in the amplifier or speaker.

The TFA9894 can adapt to changes in the acoustic environment by allowing the adaptive sound maximizer algorithm to use feedback to calculate both the temperature and the excursion accurately. The device utilizes battery protection by limiting the supply current when the battery voltage is low. This protection prevents the audio system from drawing excessive load currents from the battery, which could cause system undervoltage.

The devices present excellent audio performance and high supply voltage ripple rejection with the featured second order closed loop architecture. The TFA9894 amplifiers communicate using control settings via an I2Cbus interface and an audio input interface is TDM. The TFA9894 High-Efficiency Class-D Audio Amplifiers are offered in a 48-bump Wafer Level Chip-Size Package (WLCSP) with a 400μm pitch.

Features

  • Sophisticated SpeakerBoost and Protection algorithm that maximizes speaker performance while protecting the speaker:
    • Fully embedded software, no additional license fee or porting required
    • Fully integrated solution, including DSP, amplifier, DC-to-DC, and thermal sensing
  • Adaptive excursion control - guarantees that the speaker membrane excursion never exceeds its rated limit
  • Real-time temperature protection - direct measurement ensures that voice coil temperature never exceeds its rated limit
  • Environmentally aware - automatically adapts speaker parameters to acoustic and thermal changes including compensation for speaker-box leakage
  • Clip avoidance - DSP algorithm prevents clipping even with sagging supply voltage
  • Automatic bandwidth extension to increase the low-frequency response
  • TFA9894 high output power: 5.6W (AVG) into 8Ω at 4.0V supply voltage (THD=1%, VBST=10V), 6.2W (AVG) into 4Ω at 4.0V supply voltage (THD=1%, VBST=9V)
  • Supports handset and hands-free (4Ω to 32Ω) speaker configurations
  • High-efficiency, low-power dissipation, and low-noise speaker driver (Dynamic Range >110dB)
  • Adaptive DC-to-DC converter increases the supply voltage smoothly when switching between fixed boost and adaptive boost mode
  • Wide supply voltage range (fully operational from 2.7V to 5.5V)
  • Very low noise output (typical 14μV with null DATA input at Fs=48kHz)
  • I2C-bus control interface (400kHz)
  • Speaker current and voltage monitoring (via the TDM-bus), as well as DSP data output (with and without pilot tone) for Acoustic Echo
  • Cancellation (AEC) at the Host
  • Various sample frequencies supported:
    • TFA9894/N1: 44.1kHz, 48kHz, and 96kHz
    • TFA9894/N2: 16kHz, 32kHz, 44.1kHz, 48kHz, and 96kHz
  • Configurable full duplex 4-wire TDM input interface
  • Programmable interrupt control via a dedicated interrupt pin
  • Thermal foldback and over temperature protection
  • 15kV system-level ESD protection without external components on amplifier output

Applications

  • Mobile phones & Tablets
  • Portable Gaming Devices
  • Portable Navigation Devices (PND)

Application Block Diagram

Block Diagram - NXP Semiconductors TFA9894 High-Efficiency Class-D Audio Amplifiers