TFA9872: High-Efficiency Class-D Audio Amplifier | NXP Semiconductors

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The TFA9872 is a 9.5 V boosted class-D audio amplifier featuring Speaker-asMicrophone (SaM) and Receiver-as-Microphone (RaM) modes. It can deliver up to 10.0 W peak output power into an 8 Ω speaker and up to 11.8 W peak output power into a 6 Ω speaker, at a supply voltage of 4.0 V. The internal adaptive DC-to-DC converter raises the supply.

Data Sheet

Product Details

Features

High output power: 5.1 W (average) into 8 W at 4.0 V supply voltage (THD = 1 %)
Supports handset (16 Ω or 32 Ω) and hands-free (4 Ω or 8 Ω) speaker configurations
High-efficiency, low-power dissipation, and low-noise speaker driver
Adaptive DC-to-DC converter increases the supply voltage smoothly when switching between fixed boost and adaptive boost modes, preventing large battery supply spikes and limiting quiescent power consumption
Wide supply voltage range (fully operational from 2.7 V to 5.5 V)
Very low noise output <20×mV (with null data input at Fs = 48 kHz)
Low battery current consumption <130 mA (Po = 380 mW, average music power)
I²C-bus control interface (400 kHz)
Speaker current and voltage monitoring (via the I2S-bus) for Acoustic Echo Cancellation (AEC) at the host
16 kHz /44.1 kHz/48 kHz sample frequencies supported
Ultrasonic support (limited) via TDM/I2S running at 96 kHz/192 kHz
Configurable full-duplex 4-wire TDM/I2S input interface supporting up to 16 slots
Low-latency input path supporting side tone mixing via dedicated PDM input interface
Speaker-as-Microphone feedback path on dedicated PDM output interface or TDM interface
Programmable interrupt control via a dedicated interrupt pin
Low RF susceptibility
Thermal foldback and overtemperature protection
15 kV system-level ESD protection without external components on amplifier output