Available at Digi-Key
www.digikey.com
2111 Comprehensive Drive
Aurora, Illinois 60505
Phone: 630- 851- 4722
Fax: 630- 851- 5040
www.conwin.com
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125 Series FTS250
Disciplined Reference and
Synchronous Clock Generator
General Description
The FTS250-010.0M Frequency and Time Standard
module is a GPS driven, mixed-signal phase lock
loop, providing a 1 PPS CMOS output from a
Connor-Winfield GPS timing receiver and generating
a 10 MHz CMOS and a 10 MHz SINE output from
an intrinsically low jitter voltage controlled crystal
oscillator. The FTS250 can lock to a 10 MHz
reference derived from the on-board GPS receiver
or an external 10 MHz reference or to an external
1 PPS reference. Alarms are provided to indicate Loss-of-Lock, Holdover, and Antenna Fault. The onboard GPS receiver requires an outdoor mounted GPS antenna for the best stability and consistent
performance.
The mode control inputs are used to manually switch between references and/or holdover. The user
application should monitor the alarm outputs and manually switch modes as needed.
Serial I/O lines provide access to the NMEA messages from the GPS receiver (referenced in the
Connor-Winfield’s Wi125 User Manual. Contact Connor-Winfield Sales for a copy). The serial I/O lines
can be used to access GPS timestamp information, or to verify that the receiver has recovered from an
alarm condition. The reset is used to reset the GPS receiver (if needed).
Features
• Phase locked 10 MHz output
• 1 PPS output
• 3 selectable references: GPS, External 10 MHz or External 1 PPS
• Holdover
• Three alarm outputs. (Loss-of-Lock, Holdover and Antenna Fault)
• Serial input and output ports (GPS receiver)
• Master reset
• +3.3 Volt power supply
• Temperature Range: -40°C to 85°C
• Meets ITU-T G.811 Wander Generation Mask
• SMA Bulkhead GPS Antenna Connection
• Package: 28-pin Through-Hole
• Physical Dimensions: 2.8” x 1.725” x 0.368” (71mm x 43.82mm x 9.34mm)
• Fixed Position Unit
Bulletin
Revision
Date
Issued By
SG176
02
03 Jan 2012
ENG
