Takumi, The AFE5808A is only a better version of the AFE5808 . We only recommend AFE5808A for new designs. The AFE5807 ADC is similar to AFE5808A , but modified slightly to support 12-bit, 80-MSPS,117mW/ch mode. So, it is a faster and lower power version, but 14b performance is less. AFE5807 VCA defaults to low power mode, but supports low noise mode. The AFE5809 is very similar to the AFE5808A , but adds the I/Q digital demodulator feature. The VCA also supports low -frequency applications. Chuck Smyth
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