TFA9897UK - Boosted audio system with adaptive sound maximizer and speaker protection

TFA9897UK是NXP恩智浦公司的一款便携式设备用放大器产品，TFA9897UK是Boosted audio system with adaptive sound maximizer and speaker protection，本站介绍了TFA9897UK的封装应用图解、特点和优点、功能等，并给出了与TFA9897UK相关的NXP元器件型号供参考。

TFA9897UK - Boosted audio system with adaptive sound maximizer and speaker protection - 便携式设备用放大器 - 音频放大器 - 恩智浦

产品描述

The TFA9897 is a high efficiency class-D audio amplifier with a sophisticatedspeaker-boost protection algorithm. It can deliver 1.2 W (RMS; THD = 1 %) output powerinto an 8 Ω speaker at a battery voltage of 3.6 V. The internal boost converter raises thesupply voltage to 5.3 V, providing ample headroom for major improvements in soundquality.

A safe working environment is provided for the speaker under all operating conditions.The TFA9897 maximizes acoustic output while ensuring diaphragm displacement andvoice coil temperature do not exceed their rated limits. This function is based on aspeaker box model that operates in all loudspeaker environments (e.g. free air, closed boxor vented box). Furthermore, advanced signal processing ensures that the audio signal isalways of optimum quality.

The adaptive sound maximizer algorithm uses feedback to accurately calculate both thetemperature and the excursion, allowing the TFA9897 to adapt to changes in the acousticenvironment.

Internal intelligent DC-to-DC conversion boosts the supply rail to provide additionalheadroom and power output. The supply voltage is only raised when necessary. Thisfeature maximizes the output power of the class-D audio amplifier while limiting quiescentpower consumption.

The TFA9897 also incorporates advanced battery protection. By limiting the supplycurrent when the battery voltage is low, it prevents the audio system drawing excessiveload currents from the battery (excessive load currents could cause a systemundervoltage). The advanced processor minimizes the impact of a falling battery voltageon the audio quality by preventing distortion as the battery discharges.

The device features low RF susceptibility because it has a digital input interface that isinsensitive to clock jitter. The second order closed loop architecture used in a class-Daudio amplifier provides excellent audio performance and high supply voltage ripplerejection. The audio input interface is TDM and can be I2S configured. Control settings arecommunicated via an I2C-bus interface.

The TFA9897 is available in a 30-bump WLCSP (Wafer Level Chip-Size Package) with a400 μm pitch.

产品特性和优势

Sophisticated speaker-boost and protection algorithm that maximizes speakerperformance 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 neverexceeds its rated limit
Real-time temperature protection - direct measurement ensures that voice coiltemperature never exceeds its rated limit
Environmentally aware - automatically adapts speaker parameters to acoustic andthermal changes including compensation for speaker-box leakage
Output power: 1.2 W (RMS) into 8 Ω at 3.6 V supply voltage (THD = 1 %)
Low noise Receiver mode
Clip avoidance - DSP algorithm prevents clipping even with sagging supply voltage
Bandwidth extension option to increase low frequency response
Intelligent DC-to-DC converter maximizes audio headroom from any supply level andlimits current consumption at low battery voltages
Compatible with standard Acoustic Echo Cancellers (AECs)
High efficiency and low-power dissipation
Wide supply voltage range (fully operational from 2.5 V to 5.5 V)
TDM audio interface configurable from 2 slots (I2S) up to 16 slots
I2C-bus control interface (400 kHz)
Dedicated speech mode with speech activity detector
Speaker current and voltage monitoring (via the TDM-bus) for Acoustic EchoCancellation (AEC) at the host
Fully short-circuit proof across the load and to the supply lines
Sample frequencies from 8 kHz up to 48 kHz supported
Option to route TDM input direct to TDM output to allow a second TDM input slavedevice to be used in combination with the TFA9897
Volume control
Low RF susceptibility
Input clock jitter insensitive interface
Thermally protected
Low ‘pop noise' at all mode transitions

产品应用

Mobile phones
Tablets
Portable gaming devices
Portable Navigation Devices (PND)
Notebooks/Netbooks
MP3 players and portable media players

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