Wolfson公司的WM3100是高性能立體聲2VRMS線驅動器,具有極好的音頻性能.兩個可編程的放大器能驅動各種負載,支持單端和差分輸入配置,A加權的SNR為108dB, THD+N為-95dB,動態范圍108dB,固定增益6.4dB,主要用在數字電視,DVD,藍光DVD,STB,和游戲機.本文介紹了WM3100主要特性,方框圖, 外部元件連接框圖以及標準板電路圖和材料清單(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應用:
Digital televisions
DVD players & recorders
Blu-ray disc players
Gaming consoles
Set-top boxes
圖1.WM3100方框圖
圖2.WM3100推薦的外部元件連接框圖
The WM3100 Customer Standalone Board can be used a stand-alone module for direct connection to an end application board via flying leads or dedicated headers. This section will detail important considerations and provide all information required to do this without risking damage to the device.
圖3.WM3100標準板電路圖:線輸入/控制
圖4.WM3100標準板電路圖:WM3100
圖5.WM3100標準板電路圖:線輸出
圖6.WM3100標準板電路圖:電源
WM3100標準板材料清單(BOM):
圖7.WM3100標準板PCB布局圖(頂層)
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