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你好,VCA810是一个可调增益的运放,它是通过PIN3的Vc管脚的电压值来控制增益的,即0~2V的电压值对应+/-20db的增益。增益跟Vc之间有这样的关系G(V/V) = 10^(-2(Vc + 1))。
TI的模拟乘法器当前就MPY634,但是这种可变增益的运放倒是有很多的,具体可参看TI主页--》运放与线性器件--》PGA/VGA。