The HFA1212 Dual Video Buffer can be used to implementdifferential line drivers and receivers with a minimum ofexternal components (see Figure 2). Common moderejection is set by the internal matched thin film resistorswhich are pin strapped to set the various closed loop gainsthat are required.VIN is terminated into 75Ω and drives both amplifiers in U1.U1A has a gain of -1 while U1B has a gain of +1. Theseamplifiers create a differential signal with a gain of 2. Series75Ω resistors provide impedance matching to thetransmission line.
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