Datasheet > TFA9896UK

TFA9896UK

更新时间： 2024-11-15 01:12:43

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
22页	252K
描述
Boosted audio system with adaptive sound maximizer and speaker protection

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TFA9896UK 数据手册

TFA9896

Boosted audio system with adaptive sound maximizer and

speaker protection

Rev. 1 — 22 December 2016

Product short data sheet

COMPANY PUBLIC

1 General description

The TFA9896 is a high efficiency class-D audio amplifier with a sophisticated

SpeakerBoost protection algorithm. It can deliver 2.1 W (RMS; THD = 1 %) output power

into an 8 Ω speaker at a battery voltage of 3.6 V.

Internal adaptive 6.1 V DC-to-DC conversion boosts the supply rail to provide additional

headroom and power output. The supply voltage is only raised when necessary. This

arrangement maximizes the output power and power efficiency during audio playback.

A safe working environment is provided for the speaker under all operating conditions.

The TFA9896 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 that the quality of

the audio signal is never degraded by unwanted clipping or distortion in the amplifier or

speaker.

The adaptive sound maximizer algorithm uses feedback to accurately calculate both the

temperature and the excursion, allowing the TFA9896 to adapt to changes in the acoustic

environment.

The audio input interface is TDM and can be I²S configured. Control settings are

communicated via an I²C-bus interface.

The TFA9896 is available in a 30-bump WLCSP (Wafer Level Chip-Size Package) with a

400 µm pitch.

2 Features and benefits

• 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, amplifier, DC-to-DC, sensing and more

• 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

• Output power: 2.1 W (RMS) into 8 Ω at 3.6 V supply voltage (R_L= 8 Ω, THD = 1 %)

• Low noise (18 µV, A-weighted) use case supported for handset call (Receiver mode)

• Attenuation setting: 0 dB to -15 dB in 1 dB steps

• Clip avoidance - DSP algorithm prevents clipping even with sagging supply voltage

• Bandwidth extension option to improve low frequency response

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