M02040-15 Datasheet, PDF (19/31 Pages) M/A-COM Technology Solutions, Inc. – 3.3 5V Limiting Amplifier for Applications to 2.125 Gbps

M02040-15
3.3/5V Limiting Amplifier for Applications to 2.125 Gbps
Rev V4
Figure 3-9. Typical RSSI_PP Transfer Function (Log Scale)
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Differential Input Level (mV_PP)
3.3.6
JAM Function
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 3-10, thus forcing the
data outputs to a logic “one” state when the signal falls below the threshold.
3.3.7
DC Servo Function
When the DC_Servo pin (shown in Figure 3-10) is driven high, the M02040-15 internal DC servo loop (described in
Section 3.3.2) is disabled and the part will pass DC signals. This is useful when using signals with an unequal mark
and space ratio, when the signal contains significant low speed or DC information, or when the input to the part
must be DC coupled to a TIA that will change its common mode output voltage very quickly. Note that when the
servo loop is disabled, any offset from the TIA or within the M02040-15 will cause DCD at the output which is a
function of the offset and the input PP amplitude (large offsets and low amplitude input signals create the largest
output DCD). When this pin is tied low or floating the 2040-15 servo loop operates as described in Section 3.3.2.
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