features ? phase locked 10.0 mhz output ? 1 pps output ? 3 selectable references: gps, external 10mhz or external 1pps ? 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: -40c to 85c ? meets itu-t g.811 wander generation mask ? sma bulkhead gps antenna connection ? physical dimensions: 2.8 x 1.725 x 0.368 ( 71mm x 43.82mm x 9.34mm) ? fixed position unit 125 series fts250 disciplined reference and synchronous clock generator 2111 comprehensive drive aurora, illinois 60505 phone: 630- 851- 4722 fax: 630- 851- 5040 www.conwin.com bulletin sg176 page 1 of 12 revision 00 date 14 june 2010 issued by eng general description the fts250-010.0m frequency and time standard module is a gps driven, mixed-signal phase lock loop, providing a 1pps cmos output from a connor-winfeld gps timing receiver and generating a 10mhz cmos and a 10mhz sine output from an intrinsically low jitter voltage controlled crystal oscillator. the fts250 can lock to a 10mhz reference derived from the on-board gps receiver or an external 10mhz reference or to an external 1pps reference. alarms are provided to indicate loss-of-lock, holdover, and antenna fault. the on- board 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-winfelds wi125 user manual. contact connor-winfeld 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). d a t a s h e e t
fts250 data sheet #: sg176 p age 2 rev: 00 date: 06/14/10 ? copyright 2010 the connor-winfeld corp. all rights reserved specifcations subject to change without notice functional block diagram figure 1 cpld analog filter 1 / n low jitter vcxo or ocvcxo driver driver & translation antennna fault status 1pps cmos output lock status holdover status serial output 10 mhz cmos output 10 mhz sine output dpfd boot sel serial in gps ref 33 33 sma bulkhea d connector fts250 module 1 pps 10 mhz ref 1 pps ref reset sync 1 control sync 2 control disable ti 125 (gps receiver) tcxo reference jtag (programming only) ? pin # pin name description note 1 vcc2 3.3v 5% supply voltage for pll and interfacing circuitry 1 2 gnd 3 *reset hardware reset for gps circuitry. pull low to reset 2 4 *disable open/high = enabled outputs. low = disabled outputs 2 5 1pps ref input external 1pps reference 2 6 gnd 7 10mhz ref input external lvcmos 10mhz reference 2 8 nu used for factory programming 9 nu used for factory programming 10 nu used for factory programming 11 nu used for factory programming 12 *bootsel normally high - pulled low during cw25 software updates 13 gnd 14 vcc1 3.3v 5% supply voltage gps timing circuitry 15 antenna supply voltage 2.7 to 13.2v input supply voltage gfor the antenna. max 45ma continuous current 16 gnd 17 rxa rs-232 communication receive signal for uart-0 18 txa rs-232 communication transmit signal for uart-0 19 sync2 control lock mode selection control signal 2 2 20 sync1 control lock mode selection control signal 1 2 21 lock status high = unit is locked to the selected reference 2 22 holdover status high = unit is in holdover 2 23 antenna fault status high = fault detected on the antenna supply voltage (self clearing) 2 24 1pps cmos output 1pps lvcmos output 2 25 gnd 26 10mhz cmos output 10mhz lvcmos output 2 27 gnd 28 10mhz sine output 10mhz sine output (~9dbm) note: 1. provide a clean supply to this pin. connecting to vcc1 will degrade phase noise. 2. 3.3 vdc (lvcmos) compatible. pin description table 1
fts250 data sheet #: sg176 p age 3 rev: 00 date: 06/14/10 ? copyright 2010 the connor-winfeld corp. all rights reserved specifcations subject to change without notice notes: 1. stresses beyond those listed under absolute maximum rating may cause permanent damage to the module. these are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under operating specifcations is not implied. exposure to absolute maximum rated conditions for extended periods may affect device reliability. 2. requires external regulation and supply decoupling 3. cold power-up 4. holdover will be re-calculated with each successful lock. yearly aging represents 1 continous year in holdover. 5. includes unidirectional temperature stability, vcc stability, and 24 hours of aging. absolute maximum rating table 2 symbol parameter minimum maximum units n otes v cc power supply voltage -0.3 3.7 volts 1 v in input voltage -0.3 4.6 volts 1 v preamp antenna supply voltage 2.7 13.2 volts 1 t s storage temp erature -30 80 c 1 operating specifcations table 3 symbol parameter minimum nominal maximum units notes v cc 1 supply voltage 1 3.135 3.3 3.465 v 2 i cc 1 supply current 1 0.200 a v cc 2 supply voltage 2 3.135 3.3 3.465 v 2 i cc 2 supply current 2 0.036 a t o temperature range -40 85 c t jtol input jitter tolerance 30 ns t aq_gps gps input acquisition time 100 sec 3 t aq_ext external input acquisition time 100 sec 3 oscillator performance f cap capture/pull-in range 10 ppm f bw jitter filter bandwidth 0.8 hz dc duty cycle 45/55 % rms rms phase noise 10hz - 2mhz 1.2 ps 12khz - 2mhz 0.6 holdover/wander generation performance 4 frequency stability 0.32 ppm 5 wander generation specifcation itu-t g.811
fts250 data sheet #: sg176 p age 4 rev: 00 date: 06/14/10 ? copyright 2010 the connor-winfeld corp. all rights reserved specifcations subject to change without notice input and output characteristics table 5 lvcmos inputs and outputs symbol parameter minimum maximum units notes v ih high level input voltage 1.7 4.0 v v il low level input voltage -0.5 0.8 v v oh high level output voltage 2.4 v v ol low level output voltage 0.4 v c o output capacitance 10 pf 10mhz sine output symbol parameter typical units notes load 50 ohms output power 9 db m total harmonic distortion 2.2 % gps receiver specifcations table 6 parameter specifcations notes acquisition/tracking sensitivity -155dbm/-156dbm acquisition time: hot start w/ network assist outdoor: <2 sec indoor(-148dbm) <5 sec stand alone cold <45 sec warm: <38 sec hot: <5 sec re-acquisition: <1sec (90% confdendce) supported protocols network assist, nmea 0183 reset generation (i/o pin 3 - reset) the power-on-reset for the fts250 is generated on-board. if it is desired to extend the power-on-reset signal or provide a manual reset of the gps receiver, pull this signal low. mode control table table 4 * note: holdover is not supported in this mode; loss of the 10mhz reference will rail the pll output until the reference returns or another mode is selected.
fts250 data sheet #: sg176 p age 5 rev: 00 date: 06/14/10 ? copyright 2010 the connor-winfeld corp. all rights reserved specifcations subject to change without notice phase noise: offset frequency (hz) (dbc/hz) 10 -90 (typ) 100 -125 (typ) 1k -138 (typ) 10k -142 (typ) 100k -150 (typ) 1m -152 (typ) phase noise figure 2 antenna requirements table 7 parameter notes the fts250 antenna connector is a sma bulkhead (female) the antenna supply voltage provided to pin 15 must be within the range of 2.7 to 13.2v (amr); the antenna must be able to operate at this voltage the antennas continuous current draw must be <=45ma the antenna must have a full sky view for optimal receiver performance an active antenna with a minimum 10db gain (including cable loss) should be used standard 125 series models are designed for fxed position operation only. contact connor-winfeld sales for mobile application model offerings
fts250 data sheet #: sg176 p age 6 rev: 00 date: 06/14/10 ? copyright 2010 the connor-winfeld corp. all rights reserved specifcations subject to change without notice allan variance figure 3 wander generation plot C fts250 versus g.811 wander generation mask figure 4
fts250 data sheet #: sg176 p age 7 rev: 00 date: 06/14/10 ? copyright 2010 the connor-winfeld corp. all rights reserved specifcations subject to change without notice package dimensions figure 5 top view dimensions & keep-out area figure 6
2111 comprehensive drive aurora, illinois 60505 phone: 630- 851- 4722 fax: 630- 851- 5040 www.conwin.com revision revision date note p00 01/19/10 preliminary release 00 06/14/10 125 series update and revised to release ordering information ex: fts250-010.0m
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