3.3/5V Limiting Amplifier for Applications from 100 Mbps to 1.25 Gbps
The M02046 features 100k/300k PECL compliant outputs as shown in Figure 3-3. The outputs may be terminated
using any standard AC or DC-coupling PECL termination technique. AC-coupling is used in applications where the
average DC content of the data is zero e.g. SONET. The advantage of this approach is lower power consumption,
no susceptibility to DC drive and compatibility with non-PECL interfaces.
Figure 3-3. PECL Data Outputs
50 Ω 50 Ω
VCC - 2V
Signal Detect (ST) and Loss of Signal (LOS)
The M02046 features input signal level detection over an extended range. Using an external resistor, RST, between
pin STSET and VCC3 (Figure 3-6) 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. The Status output is either CMOS
(M02046-15) or PECL (M02046-25). The PECL version is shown in Figure 3-4 while Figure 3-5 shows the ST
output for the CMOS version of the device (and the LOS output for both versions of the device).
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.
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