TFA9881UK/N1,118

Overview

The TFA9881 is a mono, filter-free Class-D audio amplifier featuring a digital PDM input interface. It operates within a wide supply voltage range of 2.5 V to 5.5 V and delivers up to 3.4 W output power into a 4 Ω load at 5.0 V with 10% THD+N. The device achieves 90% efficiency and includes features such as dynamic power stage activation, clip control, and bandwidth extension. Packaged in a compact 1.3 × 1.3 mm WLCSP9, it supports low quiescent current modes and offers comprehensive protection against over-temperature, over-voltage, and short circuits.

Feature Summary

• Digital stereo PDM input interface with silence pattern recognition for control settings
• Dynamic Power Stage Activation (DPSA) for optimized current consumption based on audio levels
• Integrated protection mechanisms including over-temperature, over-voltage, under-voltage, and over-current protection
• Configurable gain settings and PWM slope selection for EMI reduction

Applications

• Mobile phones
• Portable gaming devices
• Notebooks/Netbooks
• MP3 players/Portable media players

Procurement Notes

Verify the specific ordering suffix and package variant against the manufacturer's official documentation before procurement. Confirm that the component meets all required environmental and safety standards for the intended application. Ensure compatibility with existing design specifications regarding supply voltages and interface requirements.

Selection Notes

Select this amplifier for applications requiring high efficiency and minimal external components. Consider the WLCSP9 package size for space-constrained designs. Evaluate the need for specific control features like DPSA or bandwidth extension based on system power and audio quality requirements. Ensure the host processor can provide the necessary PDM clock and data signals.

Part Context

The TFA9881 belongs to NXP's portfolio of high-efficiency Class-D audio amplifiers designed for portable electronics. It utilizes a sigma-delta converter architecture to drive speakers directly without output filters. The device integrates advanced digital signal processing capabilities to enhance audio performance while maintaining low power consumption.

FAQ

How is the TFA9881 configured for left or right channel operation?

The LRSEL pin determines the channel selection. A LOW state configures the amplifier for left content, while a HIGH state selects right content.

What mechanism does the TFA9881 use to reduce electromagnetic interference?

The device allows selection of the PWM output slope. Setting the slope to 'low' increases the rise and fall times of the PWM edges, which helps reduce EMI emissions.