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PGA281: G0-G4采用排阻拉高,再通过TCA9534控制拉低,发现没有起到控制变比效果

Part Number: PGA281
Other Parts Discussed in Thread: TCA9534

PGA281各管脚电压正常,DVDD=5.27V  VOCM=2.5V  VSOP=5.26V  VSON=0V  VSP=12.36V  VSN=-12.27V  Gxh=5.26V  Gxl=0V,上电默认由外部5V电源经过1K排阻给G0-G4高电平,通过TCA9534输出控制G0-G4获得低电平,经过测试将G3飞线拉低,然后上电测试放大倍数为22倍,这是正常的,但是上电之后再通过程序将G3端口拉低,测试输出没有,只有一个VOCM的偏置电压。