Wolfson公司的WM3100是高性能立體聲2VRMS線(xiàn)驅動(dòng)器,具有極好的音頻性能.兩個(gè)可編程的放大器能驅動(dòng)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(dòng)態(tài)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