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LM49150TL Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM49150TL Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 28 page  LM49150 March 4, 2009 Mono Class D Audio Subsystem with Earpiece Driver and Stereo Ground Referenced Headphone Amplifiers General Description The LM49150 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of National's Power Wise® product family, the LM49150 consumes very low power in the various modes of operation and still providing great audio performance. The LM49150 combines a 1.25W mono E2S (Enhanced Emission Suppres- sion) class D amplifier, 135mW Class AB earpiece amplifier, 42mW/channel stereo ground reference headphone ampli- fiers, volume control, and mixing circuitry into a single device. The filterless class D amplifier delivers 1.25W into an 8 Ω load with <1% THD+N with a 5V supply. The E2S class D amplifier features a patented, ultra low EMI PWM architecture that sig- nificantly reduces RF emissions while preserving audio qual- ity. The 42mW/channel headphone drivers feature National’s ground referenced architecture that creates a ground-refer- enced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing cost. The LM49150 features a fully differential mono input, and two single-ended stereo inputs. The three inputs can be mixed/ multiplexed to either the speaker or headphone amplifiers. Each input channel has an independent, 32-step digital vol- ume control. The headphone output stage features an addi- tional, 8-step gain control, while the speaker output stage has a selectable 6dB or 12dB gain. The mixer, volume control and device mode select are controlled through an I2C compatible serial interface. The LM49150’s superior click and pop suppression elimi- nates audible transients on power-up/down and during shut- down. The LM49150 is available in a ultra-small 20-bump micro SMD package (2.225mm X 2.644mm). Key Specifications ■ Output power at V DD = 5V: Speaker: R L = 8Ω BTL, THD+N ≤ 1% 1.25W (typ) Headphone: R L = 32Ω SE, THD+N ≤ 1% 42mW (typ) Earpiece: R L = 8Ω SE, THD+N ≤ 1% 135mW (typ) ■ Output power at V DD = 3.3V: Speaker: R L = 8Ω BTL, THD+N ≤ 1% 520mW (typ) Headphone: R L = 32Ω BTL, THD+N ≤ 1% 42mW (typ) Earpiece: R L = 8Ω SE, THD+N ≤ 1% 35mW (typ) ■ Output Offset LS Mode 9mV (typ) HP Mode 1mV (typ) Earpiece 1mV (typ) ■ Single Supply Operation (V DD) 2.7 to 5.5V ■ I2C Single Supply Operation 1.7 to 5.5V Features ■ E2S class D amplifier ■ Ground referenced headphone outputs — eliminates output coupling capacitors ■ I2C volume and mode control ■ Mono earpiece amplifier ■ Flexible output for speaker and headphone output ■ 20–bump micro SMD package ■ Soft enable function ■ “Click and Pop” suppression circuitry ■ Thermal shutdown protection ■ Low supply current ■ Micro-power shutdown Applications ■ Mobile Phones ■ PDAs ■ Portable Electronics Boomer® is a registered trademark of National Semiconductor Corporation. © 2009 National Semiconductor Corporation 300446 www.national.com |
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