NJR 公司的NJM2754是帶接地噪音絕緣放大器的4進(jìn)1出立體聲音頻選擇器,包括有兩路差分放大器,工作電壓4.3V到12V,典型工作電流14mA,共模抑制比(CMRR)為60dB,最大輸出電壓在THD=0.1%是大于2Vrms,典型THD為0.003%. NJM2754主要用于汽車(chē)音頻.本文介紹了NJM2754的主要特性,方框圖和應用電路.
The NJM2754 is 4In-1out stereo audio Selector with ground noise isolation amplifiers. It contains dual channel differential amplifier. It is developed for those car audio applications where long connections between head unit and other components are necessary and ground noise has to be eliminated.

NJM2754主要特性:
4in-1out Stereo Audio Selector
Operating Voltage (4.3 to 12V)
Operating Current (14mA (typ.))
Common mode rejection ratio (CMRR=60dB typ.)
Maximum Output Voltage (2Vrms min., @ THD=0.1%)
Supply Voltage Rejection Ratio (60dB typ.)
Total Harmonic Distortion (0.003% typ.)
Noise Output Voltage (1.7µVrms typ.)
Bipolar Technology
Package Outline (SSOP20)

圖1.NJM2754方框圖

圖2.NJM2754應用電路圖