www.DataSheet4U.com
LM4920 Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier
March 2006
...
www.DataSheet4U.com
LM4920 Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier
March 2006
LM4920 Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier
General Description
The LM4920 is a ground referenced, fixed-gain audio power amplifier capable of delivering 80mW of continuous average power into a 16Ω single-ended load with less than 1% THD+N from a 3V power supply. The LM4920 features a new circuit technology that utilizes a charge pump to generate a negative reference
voltage. This allows the outputs to be biased about ground, thereby eliminating output-coupling
capacitors typically used with normal single-ended loads. Boomer audio power
amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4920 does not require output coupling
capacitors or bootstrap
capacitors, and therefore is ideally suited for mobile phone and other low
voltage applications where minimal power consumption is a primary requirement. The LM4920 features a low-power consumption shutdown mode selectable for either channel separately. This is accomplished by driving either the SD_RC (Shutdown Right Channel) or SD_LC (Shutdown Left Channel) (or both) pins with logic low, depending on which channel is desired shutdown. Additionally, the LM4920 features an internal thermal shutdown protection mechanism. The LM4920 contains advanced pop & click circuitry that eliminates noises which...