LV1145BV Datasheet, PDF (5/5 Pages) Pletronics, Inc. – 6 Pad Leadless Surface Mount Oscillator

Pl tronics, Inc.
. _{19013 36th Ave. W, Suite H Lynnwood, WA 98036 USA}
Manufacturer of High Quality Frequency Control Products
PECL and LVDS Layout Guidelines Continued
PECL Terminations:
Suggested Terminations for 50 ohm impedance matched termination
Vcc
Vcc
Out
Oscillator
GND
50 ohm
Vcc
Vcc
Out
Oscillator
GND
Thevenin Equivalent Termination
R1
Vcc
R1
R2
5.0 V 82 ohm 130 ohm
3.3 V 130 ohm 82 ohm
R2
2.5 V 249 ohm 61.9 ohm
Vcc - 2.00 V
Simple termination for NON impedance matched termination
Vcc
Vcc
Out
Oscillator
GND
R load
Vcc
5.0 V
3.3 V
2.5 V
R load
274 ohm
147 ohm
86.6 ohm
LVDS Terminations:
Vcc
Vcc _{Q Out}
Oscillator
GND ^{QN Out}
100 ohm ^{Design PCB traces for 50 ohm characteristic impedance}
Mixed System Power Supply:
PECL ^{To use multiple supply voltages requires level translation. Direct circuit connection is not valid.}
ECL
Mixed supply voltages are allowed. No translation is necessary. (ECL is returned to the most positive
supply and this is common to all circuits)
LVDS ^{Mixed supply voltages are allowed. LVDS signal levels are power supply independent.}
3.3 V LVDS oscillators properly interface 2.5 V Logic Arrays for example.
Mar 2004
6A
Pl tronics, Inc. (425) 776 -1880, Fax: [phone], [e-mail], www.pletronics.com