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PGA113放大倍数一直是1,设置不起作用

AVDD和DVDD接入3.3V,VREF为1.5V左右,输入为VCAL/CH0,通过DSP F28027的SPI口去设置运放:Spi波特率为1.1MHz左右,拉底CS信号,延时100ms,发送0x2A60,延时2微秒,拉高CS,然后测试,发现放大倍数一直是1