The TFA9875 is a high efficiency boosted class-D audio amplifier. It can deliver up to 7.7 Wrms output power into an 8 Ω speaker. The device supports dual voice coil speaker protection by sensing the speaker current and the voltage over each voice coil (dual voltage sense). The internal adaptive DC-to-DC converter raises the supply voltage up to 12 V, providing ample headroom for major improvements in sound quality.
High output power: 7.7 W (average) into 8 Ω at 4.2 V supply voltage (THD = 1 %)
Supports handset and hands-free speaker configurations
Low noise: 10 μV mode in handset speaker configuration
High efficiency, low power dissipation speaker driver
Supports dual coil speaker protection, speaker current and two voltage sense circuitries integrated
Adaptive DC-to-DC converter increases the supply voltage smoothly when switching between fixed boost and adaptive boost modes, preventing that large battery supply spikes and limiting quiescent power consumption occur
Suppresses acoustical noise of the boost converter decoupling capacitor when the adaptive DC-to-DC converter is active
Wide supply voltage range (fully operational from 2.7 V to 5.5 V)
I²C-bus control interface (400 kHz)
TDM audio interface
16 kHz / 32 kHz / 44.1 kHz / 48 kHz / 96 kHz sample frequencies supported
Programmable interrupt control via a dedicated interrupt pin
Low RF susceptibility
8 kV system-level ESD protection without external components on amplifier output
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