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| M02044CG-31 Datasheet, PDF (11/22 Pages) M/A-COM Technology Solutions, Inc. – 3.3/5V Limiting Amplifier for Applications from 100 Mbps to 622 Mbps | |||
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Functional Description
3.3.2
DC Offset Compensation
The M02044 contain an internal DC autozero circuit that can remove the effect of DC offsets without using external
components. This circuit is configured such that the feedback is effective only at frequencies well below the lowest
frequency of interest. The low frequency cut off is typically 25 kHz.
3.3.3
Data Outputs
The M02044 features PECL outputs as shown in Figure 3-3. The outputs may be terminated using any standard
AC or DC-coupling PECL termination technique. AC-coupling can be used for compatibility with non-PECL
interfaces.
Figure 3-3. PECL Data Outputs
VCC
PECLP
PECLN
50 Ω 50 Ω
VCC - 2V
3.3.4
Signal Detect (ST) and Loss of Signal (LOS)
The M02044 features input signal level detection over an extended range. Using an external resistor, RST, between
pin STSET and VCC3 (Figure 3-5) the user can program the input signal threshold. The signal detect status is
indicated on the both the Signal Detect (ST) and LOS output pins. Figure 3-4 shows the ST and LOS output
structure.
The ST (LOS) signal is active (not asserted) when the signal is above the threshold value. The signal detection
circuitry has the equivalent of 3.5 dB (typical) electrical hysteresis.
02044-DSH-002-A
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