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THS4221DGK鉴别问题

Other Parts Discussed in Thread: THS4221

最近买了几块THS4221DGK运放作为射随使用,输入为正负1V的正弦波,VS+为4.7V,VS-为-4.6V,输出没有信号。

现在怀疑手头的芯片可能不是THS4221,芯片正面“TI12 BHX”,背面“12H ZJE7”,请大家帮忙看一下这块芯片是什么,谢谢啦~