SI53320-28 Datasheet, PDF (9/51 Pages) Silicon Laboratories – Output Enable option

Si53320-28 Data Sheet
Functional Description
AC Coupled LVPECL Output Termination Scheme 1
VDDO
VDDXX
Si5332x
Q
Qb
Rb Rb
R1
0.1 uF
50
50
0.1 uF
R2
R1
VDD = 3.3 V or 2.5 V
LVPECL
Receiver
R2
VBIAS = VDD – 1.3 V
R1 // R2 = 50 Ohm
3.3 V LVPECL: R1 = 82.5 Ohm; R2 = 127 Ohm; Rb = 120 Ohm
2.5 V LVPECL: R1 = 62.5 Ohm; R2 = 250 Ohm; Rb = 90 Ohm
AC Coupled LVPECL Output Termination Scheme 2
VDDXX
Si5332x
Q
Qb
Rb Rb
0.1 uF
50
50
0.1 uF ₅₀
VDD = 3.3 V or 2.5 V
LVPECL
Receiver
50
VBIAS = VDD – 1.3 V
3.3 V LVPECL: Rb = 120 Ohm
2.5 V LVPECL: Rb = 90 Ohm
Note:
For Si53320/21/22/23/25/26, VDDXX = VDD = 3.3 V, 2.5 V
For Si53327/28, VDDXX = VDDOA or VDDOB = 3.3 V, 2.5 V
Figure 2.7. LVPECL AC Output Terminations
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