Wolfson WM3100立体声2VRMS线驱动方案

Wolfson公司的WM3100是高性能立体声2VRMS线驱动器,具有极好的音频性能.两个可编程的放大器能驱动各种负载,支持单端和差分输入配置,A加权的SNR为108dB, THD+N为-95dB,动态范围108dB,固定增益6.4dB,主要用在数字电视,DVD,蓝光DVD,STB,和游戏机.本文介绍了WM3100主要特性,方框图, 外部元件连接框图以及标准板电路图和材料清单(BOM).
The WM3100 is a high performance stereo 2VRMS line driver with ground referenced outputs.
The device is ideal for cost-sensitive applications requiring line level outputs, minimal external components and small PCB area. The WM3100 offers excellent audio performance. The two high performance amplifiers are capable of driving a wide variety of loads. The device supports single-ended or differential input configurations. The input and feedback resisitors around both amplifiers are integrated within the WM3100, giving a high impedance input and a fixed signal gain of +6.4dB.
An on-board charge pump is provided to generate the negative supply for the ground-referenced drivers; the charge pump requires only two external capacitors for normal operation.
The line outputs can be muted using a hardware control input. A high impedance mute state is also supported, where the outputs are undriven - this is useful in applications where a common external connector is used as an input and an output.
The device uses a single 3.3V supply, and is available in a 14- pin SOIC.
WM3100主要特性:
108dB SNR (‘A’ weighted)
-95dB THD+N
108dB dynamic range
Single-ended or differential input
Fixed gain +6.4dB
Digital control inputs
- Mute pin
- High impedance output mode
Pop and click suppression
Fast start-up
- 200μs start-up from OFF
- 100μs start-up from MUTE
3.3V supply
14-pin SOIC
WM3100应用:
Digital televisions
DVD players & recorders
Blu-ray disc players
Gaming consoles
Set-top boxes

图1.WM3100方框图

图2.WM3100推荐的外部元件连接框图
The WM3100 Customer Standalone Board can be used a st...