GENERAL DESCRIPTION
With AVDD and DVDD = 3.0VDC and driving a 32Ω single-ended load to a 26mWRMS output level the distortion (THD+N) of the LM4921 will be less than 0.5%. The LM4921 also features a programmable 32-step digital volume control accessed through an SPI interface. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. It is, therefore, ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The LM4921 features a low-power consumption shutdown mode, and also has an internal thermal shutdown protection mechanism. 2 Key Specifications j PSRR at 217Hz, A/DVDD = 3V, (Fig. 1) j POUT at AVDD = 3.0V, 32Ω 52dB (typ) 13mW (typ) 26mW (typ) 2.6V to 5.0V 2.6V to 5.5V 1µA (typ) < 0.05% THD < 0.5% THD j Supply voltage range DVDD AVDD (Note 8) j Shutdown current FEATURES
n n n n n n n n n n 16-bit resolution stereo DAC I2S digital audio d...
National Semiconductor
