Hello,
Impedance matching from a source to the input impedance of the part is not necessary. Likewise, matching the output impedance of the part to an external load is not necessary. This is not a good idea since it will cause large voltage division.
Generally, your sources should be low impedance relative to the input impedance. The load impedance should be large relative to the output impedance.
For differential inputs, it is always recommended to match the impedance of the + and - input pair. DC blocking capacitors on these inputs should be X5R or better with tight tolerances to ensure that the impedance is the same. The trace length and routing should also be as identical as possible to keep stray inductance and capacitances equally distributed.
Regards,
Matt