关键词：线性 - 音頻放大器 1 features 1• digital input mono speaker amp • supports 8-khz to 96-khz sample rates • mono class-d btl speaker driver (2 w into 4 Ω or 1.7 w into 8 Ω) • mono headphone driver • two single-ended inputs with output mixing and level control • embedded power-on-reset • integrated ldo • programmable digital audio processing blocks for bass boost, treble, eq with up to six biquads for playback • integrated pll used for programmable digital audio processing blocks • i 2s, left-justified, right-justified, dsp, and tdm audio interfaces • i 2c control and spi control with auto-increment • full power-down control • power supplies: – analog: 1.5 v to 1.95 v – digital core: 1.65 v to 1.95 v – digital i/o: 1.1 v to 3.6 v – class-d: 2.7 v to 5.5 v (spkvdd ≥ avdd) • 24-pin vqfn package (4 mm × 4 mm) 2 applications • portable audio devices • white goods • portable navigation devices 3 description the tas2505 device is a low power digital input speaker amp with support for 24-bit digital i2s data mono playback. in addition to driving a speaker amp up to 4-ω, the device also features a mono headphone driver and a programmable digital-signal processing block. the digital audio data format is programmable to work with popular audio standard protocols (i2s, left/rightjustified) in master, slave, dsp and tdm modes. the programmable digital-signal processing block can support bass boost, treble, or eq functions. an onchip pll provides the high-speed clock needed by the digital signal-processing block. the volume level can be controlled by register control. the audio functions are controlled using the i 2c™ serial bus or spi bus. the device includes an on-board ldo that runs off the speaker power supply to handle all internal device analog and digital power needs. the included por as power-on-reset circuit reliably resets the device into its default state so no external reset is required at normal usage; however, the device does have a reset pin for more complex system initialization needs. the device also includes two analog inputs for mixing and muxing in both speaker and headphone analog paths