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NB3H5150 Datasheet(PDF) 16 Page - ON Semiconductor

Part # NB3H5150
Description  2.5V / 3.3V Low Noise Multi-Rate Clock Generator
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NB3H5150 Datasheet(HTML) 16 Page - ON Semiconductor

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NB3H5150
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16
Interfacing from 3.3 V LVPECL to LVDS
Since the output levels VOH and VOL of 3.3 V LVPECL
are more positive than the input range of LVDS receiver, a
special interface is required. (See Figures 12 and 13).
Furthermore, the open emitter design of the ECL output
structure needs
proper
termination,
which
can
be
implemented with a resistor divider network to generate
proper LVDS DC levels (eq. 1).
RE1 ) RE2 + RE
(eq. 1)
The resistor divider network will divide the output
common mode voltage of LVPECL (VCM(LVPECL)) to
input common mode voltage of LVDS (VCM(LVDS)).
RE2
RE1 ) RE2
+
VCM(LVDS)
VCM(LVPECL)
(eq. 2)
Where:
RE1 = partial emitter current bias resistor
RE2 = partial emitter current bias resistor
RE = RE1 + RE2, the total emitter current bias resistor
(see AND8020)
VCM(LVPECL) = Common Mode Voltage
VCM(LVDS) = Common Mode Voltage
3.3 V LVPECL output will be able to drive an LVDS
receiver with or without an internal 100
W termination
resistor.
Figure 12. Interfacing 3.3 V LVPECL to LVDS
LVPECL
LVDS
3.3 V
VCC
RE1
RE1
RE2
RE2
ZO
ZO
ZO
ZO
RT
100
W
Figure 13. Interfacing LVPECL to LVDS with Internal
100
W Termination Resistor
LVPECL
LVDS
3.3 V
VCC
RE1
RE1
RE2
RE2
RT
100
W
ZO
ZO
ZO
ZO
Examples:
For 50
W controlled impedance, the resistor values for
3.3V LVPECL converted to LVDS voltage levels are as
follows:
RE1 = 55
W
RE2 = 95
W
RE1 + RE2 = RE = 150
W
RT = 100
W
VCM(LVPECL) = 1.9 V
VCM(LVDS) = 1.2 V


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