"The LT®6220/LT6221/LT6222 are single/dual/quad, low power, high speed rail-to-rail input and output operational amplifiers"，所以LT6220是单通道的，LT6221是双通道的。
"The LT®6220/LT6221/LT6222 are single/dual/quad, low power, high speed rail-to-rail input and output operational amplifiers"，所以LT6220是单通道的，LT6221是双通道的。
