STC3500 Datasheet, PDF (29/48 Pages) Connor-Winfield Corporation – INTEGRATED - STRATUM 3 TIMING SOURCE

Performance Specifications continued
Phase Transients – A phase transient is an unusual step or change in the phase-time of a signal over a relatively short time
period. This may be due to switching between equipment, reference switching, diagnostics, entry or exit to/from Hold Over,
or input reference transients. The STC3500 performance for reference switches is shown below (loop bandwidth = 0.098 Hz):
Phase Transients – MITE
10000
1000
GR-1244-CORE, R5-14
100
10
1
0.001
0.01
0.1
1
10
Observation Time (sec)
100
1000
Phase Transients – TDEV
100
10
GR-1244-CORE
1
0.1
0.01
0.1
1
10
100
Integration Time (sec)
1000
10000
Capture Range and Lock Range – Capture range and lock range are the maximum frequency errors on the reference input within which
the phase locked loop is able to achieve lock and hold lock, respectively. The STC3500 stratum 3 performance is shown below:
Characteristic
Capture range
Lock in range
STC3500
± 15 ppm
± 15 ppm
Requirement
± 4.6 ppm
N/A
This is the minimum chip capability, and guarantees the ability to capture and lock with a reference that is offset the maximum allowed in
one direction in the presence of an OCXO/TCXO that is offset the maximum in the opposite direction (4.6 ppm + 4.6 ppm = 9.2 ppm).
Master/Slave Skew, Reference switch settling time, and Phase Build-Out resolution – Master/Slave Skew, Reference switch
settling time, and Phase Build-Out resolution performance are shown below:
Characteristic
Master/Slave phase skew
Reference switch settling time
Phase Build-Out resolution
STC3500
< 2 nS
Stratum 3: < 100 sec. up to 20 ppm
frequency offset
1 nS
Requirement
N/A
Stratum 3: < 100 sec. up
to +/- 4.6 ppm frequency offset
< 50 nS
Preliminary Data Sheet: TM060 Page 29 of 48 Rev: P06 Date: 11/22/04
© Copyright 2001 The Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice