LM49151是TI公司的一款无产品，LM49151是具有听筒驱动器、接地参考耳机放大器、扬声器保护、无 夹（带夹控制）的单声道 D 类子系统，本页介绍了LM49151的产品说明、应用、特性等，并给出了与LM49151相关的TI元器件型号供参考。
LM49151 - 具有听筒驱动器、接地参考耳机放大器、扬声器保护、无 夹（带夹控制）的单声道 D 类子系统 - 无 - 音频子系统 - TI公司（Texas Instruments，德州仪器）
The LM49151 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The LM49151 combines a 1.25W mono E2S class D amplifier, 125mW Class AB earpiece driver, 42mW/channel stereo ground referenced headphone drivers, volume control, input mixer/multiplexer, and speaker protection into a single device.
The LM49151 class D speaker amplifier features Texas Instruments' unique Automatic Level Control (ALC) that provides both a I2C programmable no-clip feature with Clip Controls and speaker protection. The E2S (Enhanced Emission Suppression) class D amplifier features a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency while delivering 1.25W into an 8? load with <1% THD+N with a 5V supply. The 42mW/channel headphone drivers feature Texas Instruments' ground referenced architecture that creates a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing system cost.
The LM49151 features separate volume controls for the loudspeaker and headphone inputs. Mode selection, shutdown control, and volume are controlled through an I2C compatible interface. The LM49151's superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.
- E2S Class D Amplifier
- Ground Referenced Outputs — Eliminates Output Coupling Capacitors
- I2C Programmable No Clip Function with Clip Control
- Voltage Limiter Speaker Protection
- I2C Volume and Mode Control
- Ear Piece Amplifier
- Advanced Click-and-Pop Suppression
- Low Supply Current
- Micro-Power Shutdown
- 20-bump DSBGA Package
Key Specifications
- Output Power at VDD = 3.3V THD+N ≤ 1%
- LS Mode, RL = 8? 520mW (Typ)
- HP Mode, RL = 32Ω 40mW (Typ)
- Output Power at VDD = 5V THD+N ≤ 1%
- LS Mode, RL = 8? 1.25W (Typ)
- HP Mode, RL = 32? 42mW (Typ)
- Output Offset
- LS Mode 15 6mV (Typ)
- HP Mode 15 2mV (Typ)
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