TFA9895UK

Boosted class-D audio amplifier with speaker boost protection and multiband dynamic range compressor


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The TFA9895 is a high efficiency class-D audio amplifier with a sophisticated speaker boost protection algorithm that features multi-band compression. It can deliver 2.65 W (RMS; THD = 1 %) output power into a 4 Ω speaker at a battery voltage of 3.6 V. The internal boost converter raises the supply voltage to 5.3 V, providing ample headroom for major improvements in sound quality.

A safe working environment is provided for the speaker under all operating conditions. The TFA9895 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 TFA9895 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 precaution maximizes the output power of the class-D audio amplifier while limiting quiescent power consumption.

The multi-band processing improves audio quality and apparent volume by allowing the gain to remain stable in most of the signal while the protection reacts to only those portions that would be unsafe. The TFA9895 also adds a high-frequency noise gate that improves the sound of poor-quality audio sources.

The TFA9895 also incorporates advanced battery protection. By limiting the supply current when the battery voltage is low, it prevents the audio system 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 TFA9895 is available in a 29-bump WLCSP (Wafer Level Chip-Size Package) with a 400 μm pitch.

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
  • 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
  • Output power: 2.65 W (RMS) into 4 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
  • Intelligent DC-to-DC converter maximizes audio headroom from any supply level and limits 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)
  • 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
  • Three 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 TFA9895
  • TDM interface supported
  • Volume control
  • Low RF susceptibility
  • Input interface insensitive to clock jitter
  • Thermally protected
  • Low ‘pop noise' at all mode transitions

Applications

  • Mobile phones
  • Tablets
  • Portable gaming devices
  • Portable Navigation Devices (PND)
  • Notebooks/Netbooks
  • MP3 players and portable media players
All information on this product information page is subject to the subsequent disclaimers:

Parametrics of this product

Type numberProduct status
TFA9895UKProduction

Package

Type numberPackageOutline versionReflow-/Wave solderingPackingProduct statusMarkingOrderable part number, (Ordering code (12NC))
TFA9895UK/N1
()
ActiveStandard MarkingTFA9895UK/N1J
( 9352 996 93118 )
ActiveStandard MarkingTFA9895UK/N1Z
( 9352 996 93023 )
TFA9895UK/N2
()
ActiveStandard MarkingTFA9895UK/N2AZ
( 9353 034 21062 )
ActiveStandard MarkingTFA9895UK/N2BZ
( 9353 034 21079 )

The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberPackageOutline versionReflow-/Wave solderingPackingProduct statusMarkingOrderable part number, (Ordering code (12NC))
TFA9895UK/N2
()
Withdrawn
Replacement product
Standard MarkingTFA9895UK/N2J
( 9353 034 21118 )
Withdrawn
Replacement product
Standard MarkingTFA9895UK/N2Z
( 9353 034 21023 )

Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
TFA9895UK/N2935303421118DN
TFA9895UK/N2935303421023DN

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateMSLMSL LF
TFA9895UK/N1TFA9895UK/N1JTFA9895UK/N1Always Pb-free11
TFA9895UK/N1TFA9895UK/N1ZTFA9895UK/N1Always Pb-free11
TFA9895UK/N2TFA9895UK/N2AZTFA9895UK/N2Always Pb-free11
TFA9895UK/N2TFA9895UK/N2BZTFA9895UK/N2Always Pb-free11

The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateMSLMSL LF
TFA9895UK/N2TFA9895UK/N2JTFA9895UK/N2Always Pb-free11
TFA9895UK/N2TFA9895UK/N2ZTFA9895UK/N2Always Pb-free11
Quality and reliability disclaimer

Quality and reliability disclaimer

Important Legal Notice on the product/generic quality information, No Warranty

NXP Semiconductors is providing this data for your convenience only. Please note however that NO WARRANTY, REPRESENTATION, GUARANTEE OR LEGALLY BINDING PRODUCT DESCRIPTION is provided by publishing this informational data, nor does NXP Semiconductors acknowledge or accept any liability related thereto. The documentation and data on NXP Semiconductors products can be found in the data sheets as officially published by NXP Semiconductors. For all purchase of products from NXP Semiconductors the NXP Semiconductors' General Terms and Conditions of Commercial Sale will apply.

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Any use of the data provided hereunder is at your own risk.

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The RoHS data provided hereunder is preliminary and non binding for NXP Semiconductors. NXP Semiconductors does not accept any liability related to this data.

NXP Semiconductors products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage nor for any other use that is not explicitly agreed between the parties. NXP Semiconductors accepts no liability for inclusion and/or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer's own risk.

Any use of NXP Semiconductors' products beyond the scope defined in the current NXP Semiconductors' data sheet voids all warranty responsibility of NXP Semiconductors with respect to such devices, and also voids all responsibility of NXP Semiconductors with respect to any applications assistance, product design, software performance or services of any kind that were or may have been performed in connection with the sale of any such devices.

Further, resale of NXP Semiconductors' products or services with statements different from or beyond the parameters stated by NXP Semiconductors for that product in official NXP Semiconductors data sheets, or without the warnings or instructions provided by NXP Semiconductors, voids all express and any implied warranties for the associated NXP Semiconductors product or service, and is an unfair and deceptive business practice.

Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
TFA9895UK/N2935303421118DN
TFA9895UK/N2935303421023DN

Documentation for this product

File nameTitleTypeFormatDate
TFA9895_SDSBoosted class-D audio amplifier with SpeakerBoost protection algorithm and dynamic range compressorShort data sheetpdf2013-10-23

Ordering & availability

Type numberOrdering code (12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
TFA9895UK/N19352 996 93118TFA9895UK/N1J      not available
TFA9895UK/N19352 996 93023TFA9895UK/N1Z       
TFA9895UK/N29353 034 21062TFA9895UK/N2AZ       
TFA9895UK/N29353 034 21079TFA9895UK/N2BZ       

Sample

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