LM4981 Overview
Description
The LM4981 is a stereo, ground-referenced, output capacitor-less headphone amplifier capable of delivering 83mW of continuous average power into a 16Ω load with less than 1% THD+N while operating from a single 3V supply. The LM4981 features a new circuit technology that utilizes a charge pump to generate a negative reference voltage.
Key Features
- a new circuit technology that utilizes a charge pump to generate a negative reference voltage
- The LM4981 provides high quality audio reproduction with minimal external components
- A ground referenced output eliminates the output coupling capacitors typically required to drive single-ended loads such as headphones
- Eliminating the output capacitors also improves low frequency response
- Selectable (active high/low) low power shutdown mode provides flexible shutdown control
- Superior click and pop suppression eliminates audible transients during start-up and shutdown
- The LM4981 features an Automatic Standby Mode circuitry (patent pending)
- In the absence of an input signal, after approximately 12 seconds, the LM4981 goes into low current standby mode
- The LM4981 recovers into full power operating mode immediately after a signal is applied to either the left or right input pins
- This feature saves power supply current in battery operated applications
