LM4911 Datasheet, PDF (1/30 Pages) National Semiconductor (TI) – Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL Output

LM4911, LM4911Q
www.ti.com
SNAS152M – MAY 2004 – REVISED JUNE 2011
LM4911/LM4911Q
Stereo 40mW Low Noise Headphone
Amplifier with Selectable Capacitive Coupled or OCL Output
Check for Samples: LM4911, LM4911Q
FEATURES
1
•2 OCL or Capacitively Coupled Outputs (Patent
Pending)
• External Gain-Setting Capability
• Available in Space-Saving VSSOP and WSON
Packages
• Ultra Low Current Shutdown Mode
• Mute Mode Allows Fast Turn-on (1ms) with
Less Than 1mV Change on Outputs
• 2V - 5.5V Operation
• Ultra Low Noise
• LM4911QMM is an Automotive Grade Product
that is AEC-Q100 Grade 2 Qualified.
APPLICATIONS
• Portable CD Players
• PDAs
• Portable Electronics Devices
• Automotive
KEY SPECIFICATIONS
• PSRR at 217Hz and 1kHz 65 dB (typ)
• Output Power at 1kHz with V_DD = 2.4V,
1% THD+N into a 16Ω Load 25 mW (typ)
• Output Power at 1kHz with V_DD = 3V,
1% THD+N into a 16Ω Load 40 mW (typ)
• Shutdown Current 2.0 µA (max)
• Output Voltage Change on Release from
Shutdown V_DD = 2.4V, R_L = 16Ω (C-Coupled) 1
mV (max)
• Mute Current 100 µA (max)
DESCRIPTION
The LM4911/LM4911Q is an stereo audio power
amplifier capable of delivering 40mW per channel of
continuous average power into a 16Ω load or 25mW
per channel into a 32Ω load at 1% THD+N from a 3V
power supply.
Boomer audio power amplifiers were designed
specifically to provide high quality output power with a
minimal amount of external components. Since the
LM4911/LM4911Q does not require bootstrap
capacitors or snubber networks, it is optimally suited
for low-power portable systems. In addition, the
LM4911/LM4911Q may be configured for either
single-ended capacitively coupled outputs or for OCL
outputs (patent pending).
Block Diagram
Figure 1. Block Diagram
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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