FX613 Sensitivity Threshold Adjustment

The sensitivity threshold is the difference between the ‘must’ and ‘must not’ decode levels. Currently, as defined in the FX613 Data Sheet this is set to 20.8 dB.
In many applications a smaller sensitivity threshold range is required, for example 12.0dB or 6.0dB. This Application Note describes how this can be achieved by the use of a simple external resistor chain.