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NXP Semiconductors Electronic Components Datasheet

TFA9894D_SDS Datasheet

High Efficiency Class-D Audio Amplifier

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TFA9894D_SDS
High Efficiency Class-D Audio Amplifier
Rev. 1 — 14 May 2019
Product data sheet
1 General description
The TFA9894D is a high efficiency 10 V boosted class-D audio amplifier with a
sophisticated SpeakerBoost and protection algorithm. It can deliver up to 5.6 W (AVG)
output power into an 8 Ω speaker and up to 6.2 W (AVG) output power into 4 Ω speaker,
at a battery supply voltage of 4.0 V. The internal adaptive DC-to-DC converter raises the
power supply voltage up to 10 V, providing ample headroom for major improvements in
sound quality.
A safe working environment is provided for the speaker under all operating conditions.
The TFA9894D maximizes acoustic output while ensuring membrane displacement
and voice coil temperature do not exceed their rated limits. This function is based on a
speaker box model that operates in all speaker 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 calculate both the
temperature and the excursion accurately, allowing the TFA9894D to adapt to changes in
the acoustic environment.
Internal adaptive 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 device can be configured to drive either a hands-free speaker for audio playback,
or a receiver speaker, for handset playback, allowing it to be embedded in platforms
supporting both a hands-free speaker and a handset speaker. The maximum output
power, the gain, and the noise levels are lower in handset call use case than in hands-
free call use case.
The TFA9894D also incorporates 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. This circuitry
minimizes the impact of a falling battery voltage by preventing unexpected device switch
off due to excessive current drawn from the battery.
The device features a second order closed loop architecture, used in a class-D audio
amplifier, providing excellent audio performance and high supply voltage ripple rejection.
The audio input interface is TDM and the control settings are communicated via an I2C-
bus interface.
The TFA9894D is available in a 48-bump wafer level chip-size package (WLCSP) with a
400 μm pitch.


NXP Semiconductors Electronic Components Datasheet

TFA9894D_SDS Datasheet

High Efficiency Class-D Audio Amplifier

No Preview Available !

NXP Semiconductors
TFA9894D_SDS
High Efficiency Class-D Audio Amplifier
2 Features and benefits
Sophisticated SpeakerBoost and protection algorithm that maximizes speaker
performance while protecting the speaker:
Fully embedded software, no additional license fee, or porting required
Fully integrated solution, including DSP, amplifier, DC-to-DC, thermal sensing
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
Clip avoidance - DSP algorithm prevents clipping even with sagging supply voltage
Automatic bandwidth extension to increase low-frequency response
TFA9894D high output power: 5.6 W (AVG) into 8 Ω at 4.0 V supply voltage
(THD = 1 %, VBST = 10 V), 6.2 W (AVG) into 4 Ω at 4.0 V supply voltage (THD = 1 %,
VBST = 9 V)
Support handset and hands-free (4 Ω to 32 Ω) speaker configurations.
High efficiency, low power dissipation, and low noise speaker driver (dynamic
range > 110 dB).
Adaptive DC-to-DC converter increases the supply voltage smoothly when switching
between fixed boost and adaptive boost mode, preventing large battery supply spikes
and limiting quiescent power consumption.
Wide supply voltage range (fully operational from 2.7 V to 5.5 V)
Very low noise output (typical 14 μV with null DATA input at Fs = 48 kHz)
I2C-bus control interface (400 kHz)
Speaker current and voltage monitoring (via the TDM-bus), as well as DSP data output
(with and without pilot tone) for acoustic echo cancellation (AEC) at the host.
Various sample frequencies supported: 16 kHz, 32 kHz, 44.1 kHz, 48 kHz, and 96 kHz
Configurable full duplex 4-wires TDM input interface.
Programmable interrupt control via a dedicated interrupt pin
Thermal foldback and over temperature protection
15 kV system-level ESD protection without external components on amplifier output
TFA9894D_SDS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 14 May 2019
© NXP B.V. 2019. All rights reserved.
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Part Number TFA9894D_SDS
Description High Efficiency Class-D Audio Amplifier
Maker NXP
Total Page 30 Pages
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