TFA9892 12 V boosted audio system with adaptive sound maximizer and speaker protection Rev. 1.0 1 September 2017 Product short data sheet 1. General description The TFA9892 is a high efficiency class-D audio amplifier with a sophisticated speaker boost and protection algorithm. It can deliver 13.2 W peak output power into an 8 speaker at a supply voltage of 4.0 V. The internal boost converter raises the supply voltage to 12 V, providing ample headroom for major improvements in sound quality. A safe working environment is provided for the speaker under all operating conditions. The TFA9892 maximizes acoustic output while ensuring diaphragm displacement and voice coil temperature do not exceed their rated limits. This function is based on a speaker box model that operates in all loudspeaker environments (e.g. free air, closed box or vented box). Furthermore, advanced signal processing ensures the quality of the audio signal is never degraded by unwanted clipping or distortion in the amplifier or speaker. An integrated Multiband Dynamic Range Compressor (MDRC) allows the speaker to operate at the highest possible power rating without suffering physical damage. Unlike competing solutions, the adaptive sound maximizer algorithm uses feedback to accurately calculate both the temperature and the excursion, allowing the TFA9892 to adapt to changes in the acoustic environment. Internal intelligent DC-to-DC conversion boosts the supply rail to provide additional headroom and power output. The supply voltage is only raised when necessary. This maximizes the output power of the class-D audio amplifier while limiting quiescent power consumption in combination with a Pulse Frequency Modulation (PFM) scheme. The device can be configured to drive either a hands-free speaker (4 to 8 ) for audio playback, or a receiver speaker (32 ) for handset playback, allowing it to be embedded in platforms that support either or both options. The maximum output power, gain, and noise levels are lower in the Handset Call use case than in the Hands-free Call use case. The TFA9892 also incorporates advanced battery protection. By limiting the supply current when the battery voltage is low, it prevents the audio system from drawing excessive load currents from the battery, which could cause a system undervoltage. The advanced processor minimizes the impact of a falling battery voltage on the audio quality by preventing distortion as the battery discharges. Because it has a digital input interface, the TFA9892 features low RF susceptibility. The second order closed loop architecture used in a class-D audio amplifier provides excellent 2 audio performance and high supply voltage ripple rejection. The TDM/I S audio interface provides a wide range of settings for multiple slots and Digital I/O. The settings are 2 communicated via an I C-bus interface.TFA9892 NXP Semiconductors 12 V boosted audio system with adaptive sound maximizer and speaker protection The device also provides the speaker with robust protection against ESD damage. In a typical application, no additional components are needed to withstand a 15 kV discharge on the speaker. The TFA9892 is available in a 49-bump WLCSP (Wafer Level Chip-Size Package) with a 400 m pitch. 2. Features and benefits Output power: 6.6 W into 8 at 4.0 V supply voltage (THD = 1 %) Wide range of speakers: 4 to 8 for hands-free mode and 16 , 32 for handset one Sophisticated speaker-boost and protection algorithm that maximizes speaker performance while protecting the speaker: Fully embedded software, no additional license fee or porting required Total integrated solution that includes DSP, ClassD amplifier, DC-to-DC converter Adaptive excursion control - guarantees that the speaker membrane excursion never exceeds its rated limit Multiband dynamic range compressor (DRC) allows independent control of up to three frequency bands 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 2 Four TDM/I S inputs output (I/O) to support two audio sources or one PDM input and inter-chip communications Speaker current and voltage monitoring via TDM for Acoustic Echo Cancellation (AEC) at the host Option to route TDM input direct to TDM output to allow a second TDM output slave device to be used in combination with the TFA9892 Sample frequencies f from 16 kHz to 48 kHz supported in TDM/I2S mode s speaker-boost and protection algorithm sample rate up to 48 kHz. 3 bit clock/word select ratios supported (32x, 48x, 64x) in TDM/I2S mode 2 I C-bus control interface (400 kHz) 12 V DC-to-DC converter using PFM mode Wide supply voltage range (fully operational from 2.7 V to 5.5 V) Fully short-circuit proof across the load and to the supply lines Low RF susceptibility Input clock jitter insensitive interface Thermally protected 15 kV system-level ESD protection without external components Pop noise free at all mode transitions 3. Applications Mobile phones Tablets TFA9892 SDS All information provided in this document is subject to legal disclaimers. NXP B.V. 2017. All rights reserved. Product short data sheet Rev. 1.0 1 September 2017 2 of 27