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1. Introduction
The TFA9879 is a high-efficiency filter-free mono class-D audio amplifier with two
separate digital inputs for mobile applications.
2. General description
The TFA9879 contains a processor that supports a range of sound processing features
including a 5-band parametric equalizer, separate bass and treble control, a dynamic
range compressor, soft clip control and volume control. Excellent audio performance
combined with high Power Supply Rejection Ratio (PSRR) is achieved through the use of
a closed loop configuration.
Two independent digital audio inputs (I
2
S-bus / PCM / IOM2) are available for connecting
both a baseband and a multimedia processor.
The TFA9879 is available in a HVQFN24 package.
3. Features and benefits
3.1 General features
Closed loop amplifier for:
High power supply rejection ratio
Excellent audio performance
Digital input for high RF immunity
High efficiency for maximizing battery life
Wide supply voltage range (fully operational from 2.5 V to 5.5 V)
Delivers high output power into 4 Ω and 8 Ω load impedances
Phase-Locked Loop (PLL); no system clock required
Protection including diagnostics via I
2
C-bus:
OverCurrent Protection (OCP) to protect against short circuits across the speaker,
to the supply line or to ground
OverTemperature Protection (OTP)
Digital inputs protected with UnderFrequency Protection (UFP), OverFrequency
Protection (OFP) and Invalid Bit-clock Protection (IBP)
‘Pop noise’ free at power-up/power down, during sample rate switching and when
switching between digital inputs
Four separate I
2
C-bus addresses for multi-channel applications
TFA9879
Mono BTL class-D audio amplifier for portable applications
with digital input
Rev. 02 — 15 October 2010 Product data sheet
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