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 (I2S-bus / PCM / IOM2) are available for connecting both a baseband and a multimedia processor.

Features:

„- 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 I2C-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 I2C-bus addresses for multi-channel applications„ - 1.8 V / 3.3 V tolerant digital inputs „ - Only three external components required 3.2 Programmable Digital Sound Processor (DSP) „ - Digital volume control (−70 dB to +24 dB) „ - Digital parametric 5-band equalizer „ - Bass and treble control (−18 dB to +18 dB) „ - Dynamic range compressor: ‹ - Programmable attack and release levels ‹ - Programmable attack and release rates „ - Soft and hard mute control „ - Programmable DC blocking via high-pass filter „ - Power limiter (0 dB to −124 dB in 0.5 dB steps) „ - Zero crossing volume control „ - Stereo-to-mono down-mix function 3.3 - Interface format support for digital audio inputs „ - I 2S formats (fs = 8 kHz to 96 kHz): ‹ - Philips standard I2S-bus ‹ - Japanese I2S-bus MSB-justified ‹ - Sony I2S-bus LSB-justified „ - PCM / IOM2 formats (fs = 8 kHz or fs = 16 kHz): ‹ - Long frame sync ‹ - Short frame sync

Applications:

-„ Mobile phones „ - Portable Navigation Devices (PND) „ - PDAs „ - Notebooks „ - Portable gaming devices „ - MP3 and MP4 players