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PGA280的MUX的问题

Fuyi Wang
Prodigy 92 points
Other Parts Discussed in Thread: PGA280

我找遍PDF也不知道MUX配置是要选择哪路信号。比如说3'b000是选通哪两路？？？

  • 0
    Guru 63401 points

    应该还没有看仔细吧

    Gain is controlled by Register 0. This register can control the gain and address for an external MUX in one byte. Selectable gains (in V/V) are : 128, 64, 32, 16, 8, 4, 2, 1, ½, ¼, and ⅛. The gain is set to 1/8V/V after device reset or power-on.

  • 0
    TI__Guru**** 295050 points

    datasheet Figure44的图是PGA280的输入端内部开关的图，当PGA280上电reset后，默认的是A1,A2关闭，其他开关打开，所以输入信号选择的是INP1和INN1。

    如果要使用channel 2，请参考应用手册的Page5的介绍：

    For using Channel 2, INP2 and INN2, send this instruction:
    L 66 18 H ; This command activates the BUF stage and connects INP2 and INN2 to the amplifier.