TFA9890AUK数据手册恩XP中文资料规格书

描述 Description

Overview
The TFA9890A is a high efficiency class-D audio amplifier with a sophisticated speaker
boost and protection algorithm. It can deliver 7.2 W peak output power into an 8 Ω
speaker at a supply voltage of 3.6 V. The internal boost converter raises the supply
voltage to 9.5 V, providing ample headroom for major improvements in sound quality.

A safe working environment is provided for the speaker under all operating conditions.
The TFA9890A 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.

Unlike competing solutions, the adaptive sound maximizer algorithm uses feedback to
accurately calculate both the temperature and the excursion, allowing the TFA9890A 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.

The TFA9890A 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.

The device features low RF susceptibility because it has a digital input interface that is
insensitive to clock jitter. The second order closed loop architecture used in a class-D
audio amplifier provides excellent audio performance and high supply voltage ripple
rejection. The audio input interface is I²S and the control settings are communicated via
an I²C-bus interface.

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 TFA9890A is available in a 49-bump WLCSP (Wafer Level Chip-Size Package) with a
400 μm pitch.

特性 Features

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

Speaker error detection (detects faulty speakers and enclosures)

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

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

Bandwidth extension option to increase low frequency response

Compatible with standard Acoustic Echo Cancellers (AECs)

High efficiency and low power dissipation

Wide supply voltage range (fully operational from 2.7 V to 5.5 V)

Two I²S inputs to support two audio sources

I²C-bus control interface (400 kHz)

Dedicated speech mode with speech activity detector

Speaker current and voltage monitoring (via the I²S-bus) for Acoustic Echo
Cancellation (AEC) at the host

Fully short-circuit proof across the load and to the supply lines

Sample frequencies from 8 kHz to 48 kHz supported

3 bit clock/word select ratios supported (32x, 48x, 64x)

Option to route I²S input direct to I²S output to allow a second I²S output slave device
to be used in combination with the TFA9890A

TDM interface supported (with limited functionality)

Volume control

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

应用 Application

Mobile phones


Tablets

Portable Navigation Devices (PND)

Notebooks/Netbooks

MP3 players and portable media players

Small audio systems