LM4947
Description
The LM4947 is an audio subsystem capable of efficiently delivering 500mW (Class D operation) of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N, 37mW (Class AB operation) power channel of continuous average power into stereo 32Ω single-ended (SE) loads with 1% THD+N, or an output capacitor-less (OCL) configuration with identical specification as the SE configuration, from a 3.3V power supply. The LM4947 has six input channels: one pair for a twochannel stereo signal, the second pair for a secondary twochannel stereo input, and the third pair for a differential single-channel mono input.
Key Features
- I2C programmable National 3D Audio
- I2C controlled 32 step digital volume control (-59.5dB to +18dB)
- Three independent volume channels (Left, Right, Mono)
- Eight distinct output modes
- Small, 25–bump micro SMD packaging n “Click and Pop” suppression circuitry
- Thermal shutdown protection
- Low shutdown current (0.1µA, typ)
- RF suppression
- Differential mono and stereo inputs
- Stereo input mux
