LM49250 - 具有接地参考耳机放大器的增强型排放抑制立体声 D 类音频子系统

LM49250是TI德州仪器公司的一款无产品，LM49250是具有接地参考耳机放大器的增强型排放抑制立体声 D 类音频子系统，本站介绍了LM49250的封装应用图解、特点和优点、功能等，并给出了与LM49250相关的TI元器件型号供参考。

LM49250 - 具有接地参考耳机放大器的增强型排放抑制立体声 D 类音频子系统 - 无 - 音频子系统 - 德州仪器

产品描述

The LM49250 is a fully integrated audio subsystem designed for stereo cell phone applications. The LM49250 combines a 2.4W/Ch stereo class D speaker amplifiers with a 45mW/Ch stereo ground referenced headphone amplifier, a class AB earpiece amplifier, TI 3D enhancement, volume control, and an input mixer into a single device. The filterless class D amplifiers deliver 1.2W/Ch into an 8? load with <1% THD+N from a 5V supply.

The LM49250 features a new circuit technology that utilizes a charge pump to generate a negative supply voltage. This allows the headphone outputs to be biased about ground, thereby eliminating the output-coupling capacitors.

For improved noise immunity, the LM49250 features fully differential left, right and mono inputs. The three inputs can be mixed/multiplexed to any output combination of the loudspeaker, headphone or earpiece amplifiers. The left and right differential inputs can be used as separate single-ended inputs, mixing multiple stereo audio sources. The mixer, volume control, and device mode select are controlled through an I2C compatible interface.

Output short circuit and thermal overload protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

产品特性

Output Short Circuit Protection
Thermal Overload Protection
Stereo Filterless Class D Operation
Spread Spectrum Modulation
Ground Referenced Headphone Drivers
I2C Control Interface
32-Step Input Volume Control
Output Volume Control
Minimum External Components
Click and Pop Suppression
Micro-Power Shutdown
Available in Space-Saving 36–Bump DSBGA Package
Single Supply Operation
RF Suppression

Key Specifications

Power Output at VDD = 5V Speaker:
- RL = 4?, THD+N ≤ 1%: 1.97W/Ch
- RL = 4?, THD+N ≤ 10%: 2.4W/Ch
- RL =8?, THD+N ≤ 1%: 1.2W/Ch
Headphone:
- RL = 16?, THD+N ≤ 1%: 41mW/Ch
- RL = 32?, THD+N ≤ 1%: 45mW/Ch
Earpiece:
- RL = 16?, THD+N ≤ 1%: 170mW
- RL = 32?, THD+N ≤ 1%: 90mW
Shutdown Current: 0.1μA
Efficiency at 5V, 1W into 8?: 87%
Efficiency at 3.6V, 500mW into 8?: 85%

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