3.3/5V Limiting Amplifier for Applications from 100 Mbps to 1.25 Gbps
Note that STSET can be left open if the loss of signal detector function is not required. In this case LOS would be
Figure 3-6. STset Input
When asserted, the active high power down (JAM) pin forces the outputs to a logic “one” state. This ensures that
no data is propagated through the system. The loss of signal detection circuit can be used to automatically force
the data outputs to a high state when the input signal falls below the threshold. The function is normally used to
allow data to propagate only when the signal is above the user's bit-error-rate requirement. It therefore inhibits the
data outputs toggling due to noise when there is no signal present (“squelch”).
In order to implement this function, LOS should be connected to the JAM pin shown in Figure 3-7, thus forcing the
data outputs to a logic “one” state when the signal falls below the threshold.
Figure 3-7. JAM Input
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