RCV420: Ref Noise Reduction pin utilization

Stefano

The function of the REF Noise reduction pin is discussed in the data sheet on page 7 under Voltage Reference:

The high-frequency noise (to 1MHz) of the voltage reference
is typically 1mVp-p. When the voltage reference is
used for level shifting, its noise contribution at the output of
the receiver is typically 125mVp-p due to the 8:1 attenuation
from Ref In to Rcv Out. The reference noise can be reduced
by connecting an external capacitor between the Noise
Reduction pin and ground. For example, 0.1mF capacitor
reduces the high-frequency noise to about 200mVp-p at the
output of the reference and about 25mVp-p at the output of
the receiver.

Regards
Dennis