SCG4600 Datasheet, PDF (1/12 Pages) Connor-Winfield Corporation – Synchronous Clock Generators

2111 Comprehensive Drive
Aurora, Illinois 60505
Phone: [phone]
Fax: [phone]
www.conwin.com
SCG4600
Synchronous Clock
Generators
PLL
Bulletin
Page
Revision
Date
Issued By
SG028
1 of 12
P01
19 July 02
MBatts
General Description
The SCG4600 is a digital phase locked loop generating
CML outputs from an intrinsically low jitter voltage
controlled crystal oscillator.
The SCG4600 can lock to one of two external 8 kHz
references, which is selectable using the SELAB input
select pin. The unit has an acquisition time of about 1.5
seconds and it is tolerant of different reference duty
cycles.
The SCG4600 includes an alarm output that
indicates deviations from normal operation. If a Loss-
of-Reference (LOR) or Loss-of-Lock (LOL) is detected
the alarm with indicate the need for a reference
rearrangement. If both references A and B are absent
the module will enter Free Run operation. The
FRstatus pin will indicate that the module is in Free
Run operation. Frequency stability during Free Run
operation is guaranteed to ±20 PPM. Additionally the
Free Run mode may be entered manually.
The package dimensions are 1.05" x 1.03" x .375"
(maximum) on a 4 layer FR4 board with J-Leads. Parts
are assembled using high temperature solder to
withstand 180°C surface mount reflow processes.
Features
• Phase Locked Output
Frequency Control
• Intrinsically Low Jitter
Crystal Oscillator
• CML Outputs
• Dual 8 kHz
References
• LOR & LOL Alarm.
• Force Free Run
Function
• Automatic Free Run
Operation on Loss of
Both References A &
B
• Input Duty Cycle
Tolerant
• 3.3VDC Power Supply