M02044CG-31 Datasheet, PDF (18/22 Pages) M/A-COM Technology Solutions, Inc. – 3.3/5V Limiting Amplifier for Applications from 100 Mbps to 622 Mbps

Applications Information
Figure 4-5. Typical Loss of Signal Hysteresis Characteristic (Full Input Signal Range)
5.0
4.5
Electrical Hysteresis = 20*log₁₀(De-assert/Assert)
4.0
3.5
3.0
2.5
Conditions:
2.0
622 Mbps, 2 ³¹ - 1
1.5
Vcc = 3.3V, Temp = 25C
1.0
0.5
0.0
5.5 5.7 5.9 6.1 6.3 6.5 6.7 6.9 7.1 7.3 7.5
R_ST (kΩ)
4.1.5
PECLP and PECLN Termination
The data outputs of the M02044 are PECL. Figure 4-6 illustrates PECL compliant PECL termination. This is the
only termination where PECL specifications are guaranteed (this is level shifted ECL100k/300k ECL termination).
For the high speed PECLP and PECLN outputs any standard AC or DC-coupling termination technique can be
used. Figure 4-7 illustrates the most common PECL termination in use today and Table 4-2 lists the pull down
resistor values. Since this type of termination is AC coupled, the actual VOH and VOL levels are not meaningful for
the PECL outputs. Only the peak to peak swing is transmitted to the load device.
Figure 4-6. True PECL Termination
VCC
PECLP ^Zo
M02044 _PECLN ^Zo
VCC
PECL
50 Ω
50 Ω
V_CC - 2V
10 nF
02044-DSH-002-A
Mindspeed Technologies™
16
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