The MC10216 is a high speed triple differential amplifier designed for use in sensing differential signals over long lines. The base bias supply (VBB) is made available at pin 11 to make the device useful as a Schmitt trigger, or in other applications where a stable reference voltage is necessary. Active current sources provide the MC10216 with excellent common mode noise rejection. If any amplifier in a package is not used, one input of that amplifier must be connected to VBB (pin 11) to prevent upsetting the current source bias network.