I want to use the hook detector provided in the CMX860 but there is no recommended application circuit in the data bulletin. How do I use the on-chip hook detector circuit?
A. The CMX860 internal hook detector circuitry is identical to the internal ring detector circuitry. The purpose of the recommended ring detector external circuitry is to condition an incoming ring signal for presentation to the CMX860 ring detection circuit. The external circuitry rectifies and attenuates the signal so that it can be presented to the internal ring detector circuitry, which is effectively a threshold detector. The nature of checking hook switch status makes this type of external circuitry unsuitable for use with the CMX860 hook detector (e.g. blocking capacitors preclude differential DC voltage measurement). The internal hook detector circuitry is designed to indicate (internal to the chip) when the input to the circuit has reached a certain threshold. If the tip/ring differential voltage is conditioned properly and presented to the hook detector input, the hook detector’s Schmitt trigger will trip when the tip/ring differential voltage falls to some predetermined leve
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