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Ë 2 S-class amplifier
- Ground-referenced headphone output - eliminates output coupling capacitance
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I 2 C quantity and mode control
- Mono headphone amplifier
- Flexible outputs are speaker and headphone outputs
- 20-bump micro SMD package
- Soft-enabled function
- "Click" sound suppression circuit
- Thermal shutdown protection
- Low supply current
- Micropower shutdown
illustrate
LM49150 is an audio subsystem designed for portable handheld applications such as fully integrated cellular phones. The Power Wise ® product line in select countries still delivers superior audio performance with very low power consumption LM49150 various operating modes. LM49150 combined with a 1.25W single E 2 S (Enhanced Transmit Suppression) Class D amplifier, 135MW Class AB headphone amplifier, 42mW/channel stereo grounded reference headphone amplifier, volume control, and hybrid circuitry to a single device.
无滤波器D类放大器到 My E 2 The Class S-Class D amplifier features a patented PWM architecture with ultra-low electromagnetic interference that dramatically reduces RF emissions while maintaining audio quality. The 42mW/channel headphone driver uses National Semiconductor's grounding reference architecture to create an output from a single supply as a reference, eliminating bulky and expensive DC capacitors, saving space and reducing costs.
LM49150 has a fully differential mono input, and two single-ended stereo inputs. It is possible to mix and match these three inputs/multiplexing, whether it is a speaker or a headphone amplifier. Each input channel has an independent, 32-step digital volume control. The headphone output stage has an additional 8-step gain control, while the speaker output stage has a selectable 6dB or 12 dB gain. Mixer, volume control and device mode selection control, via I 2 C-compatible serial interface.
LM49150's superior click and pop suppression eliminates audible transient noise when power-up/down and off. LM49150 is in an ultra-compact 20-bump micro SMD package (2.225 mm x 2.644 mm).
Key specifications:
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■ Output power at V DD = 5V:
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Speakers: R L = 8Ω of BTL THD + N ≤ 1％
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1.25W (typical)
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Earphone: R L = THD + N for 32 ΩSE ≤ 1％
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42mW (typical)
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Receiver: R L = THD + N for 8 ΩSE ≤ 1％
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135MW (typical)
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■ Output power at V DD = 3.3V:
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Speakers: R L = 8Ω of BTL THD + N ≤ 1％
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520mW (typical)
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Earphone: BTL THD + N for R L = 32 Ω ≤ 1％
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42mW (typical)
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Receiver: R L = THD + N for 8 ΩSE ≤ 1％
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35MW (typical)
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■ Output offset
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LS mode
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9mV (typical)
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HP mode
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1mV (typical)
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receiver
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1mV (typical)
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■ Single Supply (V DD)
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2.7 to 5.5V
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■ I 2 C Single power supply
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1.7 to 5.5V
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apply
- mobile phone
- handheld computer
- Portable electronics
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