Описание
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. The TFA9879 is available in a HVQFN24 package.
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 O and 8 O 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 addresses for multi-channel applications
- 1.8 V / 3.3 V tolerant digital inputs
- Only three external components required
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
Interface format support for digital audio inputs
- I²S formats (fs = 8 kHz to 96 kHz):
- Philips standard I²S
- Japanese I²S MSB-justified
- Sony I²S LSB-justified
- PCM / IOM2 formats (fs = 8 kHz or fs = 16 kHz):
- Long frame sync
- Short frame sync
