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High-Efficiency Class-D Audio Amplifier with Speaker-as-Microphone
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The TFA9872 is a 9.5 V boosted class-D audio amplifier featuring Speaker-asMicrophone (SaM) and Receiver-as-Microphone (RaM) modes. It can deliver up to 10.0 W peak output power into an 8 Ω speaker and up to 11.8 W peak output power into a 6 Ω speaker, at a supply voltage of 4.0 V. The internal adaptive DC-to-DC converter raises the supply.
製品詳細
Features
- High output power: 5.1 W (average) into 8 W at 4.0 V supply voltage (THD = 1 %)
- Supports handset (16 Ω or 32 Ω) and hands-free (4 Ω or 8 Ω) speaker configurations
- High-efficiency, low-power dissipation, and low-noise speaker driver
- Adaptive DC-to-DC converter increases the supply voltage smoothly when switching between fixed boost and adaptive boost modes, 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 <20×mV (with null data input at Fs = 48 kHz)
- Low battery current consumption <130 mA (Po = 380 mW, average music power)
- I²C-bus control interface (400 kHz)
- Speaker current and voltage monitoring (via the I2S-bus) for Acoustic Echo Cancellation (AEC) at the host
- 16 kHz /44.1 kHz/48 kHz sample frequencies supported
- Ultrasonic support (limited) via TDM/I2S running at 96 kHz/192 kHz
- Configurable full-duplex 4-wire TDM/I2S input interface supporting up to 16 slots
- Low-latency input path supporting side tone mixing via dedicated PDM input interface
- Speaker-as-Microphone feedback path on dedicated PDM output interface or TDM interface
- Programmable interrupt control via a dedicated interrupt pin
- Low RF susceptibility
- Thermal foldback and overtemperature protection
- 15 kV system-level ESD protection without external components on amplifier output
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