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LM4981 Arkusz danych(PDF) 1 Page - National Semiconductor (TI) |
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LM4981 Arkusz danych(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page LM4981 Ground-Referenced, 80mW Stereo Headphone Amplifier with Digital Volume Control General Description The LM4981 is a stereo, ground-referenced, output capacitor-less headphone amplifier capable of delivering 83mW of continuous average power into a 16 Ω 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. This allows the outputs to be biased about ground, thereby elimi- nating output-coupling capacitors typically used with normal single-ended loads. 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. The ground reference architecture reduces components count, cost and board space consumption, making the LM4981 ideal for handheld MP3 players, mobile phones and other portable equipment where board space is at a premium. Eliminating the output capacitors also improves low fre- quency response. The LM4981 operates from a single 2.0V – 4.2V supply, and features a 2-wire, up/down volume control that sets the gain of the amplifier between -33dB to +12dB in 16 discrete steps. 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 cur- rent 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. Key Specifications j Improved PSRR at 217Hz 67dB (typ) j THD+N at 1kHz, 50mW into 32 Ω SE (3V) 1.0% (typ) j Single Supply Operation (VDD) 2.0 to 4.2V j Power Output at VDD = 3V, RL=16 Ω, THD ≤ 1% 83mW (typ) j Shutdown Current 0.01µA (typ) Features n Ground Referenced Outputs n No Output Coupling Capacitors n 16-Step Volume Control n Auto-Standby Mode n High PSRR n Available in Space Saving LLP package n Low Power Shutdown Mode n Improved Click and Pop Suppression Eliminates Noises During Turn-on and Turn-off Transients n 2.0V to 4.2V Operation n 83mW Per Channel Into 16 Ω n Selectable Shutdown Controls (Active High/Low) Applications n Portable MP3 Players n Mobile Phones n PDAs Boomer® is a registered trademark of National Semiconductor Corporation. November 2005 © 2005 National Semiconductor Corporation DS201473 www.national.com |
Podobny numer części - LM4981 |
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Podobny opis - LM4981 |
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