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MSTM-S3-TR-12032.768M Datasheet(PDF) 2 Page - Connor-Winfield Corporation |
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MSTM-S3-TR-12032.768M Datasheet(HTML) 2 Page - Connor-Winfield Corporation |
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2 / 16 page  Data Sheet #: TM027 Page 2 of 16 Rev: P05 Date: 12 / 02 / 02 © Copyright 2001 The Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice General Description The Connor-Winfield Stratum 3 Simplified Control Timing Mod- ule acts as a complete system clock module for general Stratum 3 timing applications. The MSTM is designed to replace similar units from TF Systems (TF118B) and Raltron (SY0001B). Full external control input allows for selection and monitoring of any of four possible operating states: 1) Holdover, 2) External Reference #1, 3) External Reference #2, and 4) Free Run. Table #1 illustrates the control signal inputs and corresponding opera- tional states. In the absence of External Control Inputs (A,B), the MSTM enters the Free Run mode and signals an External Alarm. The MSTM will enter other operating modes upon application of a proper control signal. Mode 1 operation (A=1, B=0) results in an output signal that is phase locked to the External Reference Input #1. Mode 2 operation (A=0, B=1) results in an output sig- nal that is phase locked to External Reference Input #2. Hold- over mode operation (A=1, B=1) results in an output signal at or near the frequency as determined by the latest (last) locked- signal input values and the holdover performance of the MSTM. Free Run ModeFree Run mode operation (A=0, B=0) is a guar- anteed output of 4.6 ppm of the nominal frequency. Alarm signals are generated at the Alarm Output during Hold- over and Free Run operation. Alarm Signals are also generated by Loss-of-Lock and Loss-of-Reference conditions. A high level indicates an alarm condition. Real-time indication of the opera- tional mode is available at unique operating mode outputs on pins 1-4. Control loop 0.1 Hz filters effectively attenuate any reference jitter, smooth out phase transients, comply with wander transfer and jitter tolerances. Absolute Maximum Rating Table 2 Symbol Parameter Minimum Nominal Maximum Units Notes V CC Power Supply Voltage -0.5 7.0 Volts 1.0 V I Input Voltage -0.5 V CC + 0.5 Volts 1.0 T s Storage Temperature -55 100 deg. C 1.0 Functional Block Diagram Figure 1 Stratum3 OCXO Stratum3 OCXO Holdover FIFO Holdover FIFO DAC DAC Phase Build Out Circuit Phase Build Out Circuit Tuning Voltage Monitor Tuning Voltage Monitor 1 2 3 4 Free Run Ref #1 Ref #2 Hold Over CNTL A CNTL B Sync_Out Ref Control Ref Control Ex Ref 1 Ex Ref 2 PLL_TVL Free Run Hold Over LOL & LOR Alarm_Out ÷N DPLL Reference Clock Opt_Out* *Only one Opt_Out option is available per module CNTL CNTL Operational Ref 1 Ref 2 Hold Over Free Run PLL Unlock Alarm Out A B Mode 0 0 Free Run (Default Mode) 0 0 0 1 0 1 External Normal 1 0 0 0 0 0 1 0 Reference PLL_Unlock 1 0 0 0 1 0 #1 LOR 0 0 1 0 0 1 External Normal 0 1 0 0 0 0 0 1 Reference PLL_Unlock 0 1 0 0 1 0 #2 LOR 0 0 1 0 0 1 1 1 Hold Over 0 0 1 0 0 1 Function Control Table Table 1 |
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