描述 Description

The LM49120 is a compact audio subsystem designed for portable handheld applications such as cellular phones. The LM49120 combines a mono 1.3W speaker amplifier, stereo 85mW/ch output capacitorless headphone amplifier, 32 step volume control, and an input mixer/multiplexer into a single 16–bump DSBGA package. The LM49120 has three input channels: two single-ended stereo inputs and a differential mono input. Each input features a 32-step digital volume control. The headphone output stage features an 8 step (-18dB – 0dB) attenuator, while the speaker output stage has two selectable (0dB/+6dB) gain settings. The digital volume control and mode control are programmed through a two-wire I2C compatible interface.

特性 Features

? RF Immunity
? Selectable OCL/SE Headphone Drivers
? 32 Step Volume Control
? Click and Pop Suppression
? Independent Speaker and Headphone Gain Settings
? Minimum External Components
? Thermal Over Load Protection
? Micro-power Shutdown
? Space Saving 16–bump DSBGA Package
? Thermal Shutdown Protection
? Micro-power Shutdown
? I2C Control Interface
Key Specifications
? Output Power at VDD = 5V:
? Speaker: RL = 8Ω BTL, THD+N ≤ 1%: 1.3W (typ)
? Headphone: RL = 32Ω, SE, THD+N ≤ 1%: 85mW (typ)

? Output Power at VDD = 3.6V:
? Speaker: RL = 8Ω, BTL, THD+N ≤ 1%: 632mW (typ)

? Output Power at VDD = 3.3V:
? Speaker: RL = 8Ω, BTL, THD+N ≤ 1%: 540mW (typ)
? Headphone: RL = 32Ω, OCL/SE, THD+N ≤ 1%: 35mW (typ)