stc3800 Connor-Winfield VCXOs, stc3800 Datasheet - Page 41

• Manufacturer Part Number: stc3800
• Description: Integrated - Stratum 3e Timing Source
• Manufacturer: Connor-Winfield VCXOs

Application Notes continued
frequency of a particular reference, the device requires 20mS to auto-detect the new frequency. Manual switches to a
frequency changed reference should not be made during this interval.)
LOS, LOL, and Hold_Rdy are status indication outputs. Their use is at the discretion of the application. See Phase Lock
Operation and Pin Description sections for details of their operation.
buildout default to stratum 3. Therefore, Stratum 3E operation requires use of register access.
Sel0-3 - Write to the appropriate values for the desired reference selection and operating mode, as shown below:
(Note: Reference switches are performed in a hitless manner. However, if the application externally changes the
In Hardware Control mode, the Sync_8K and Sync_2K signals default to 50% duty cycle, and PLL bandwidth/ phase
Reference / Mode
Free Run
Lock to Ref1
Lock to Ref2
Lock to Ref3
Lock to Ref4
Lock to Ref5
Lock to Ref6
Lock to Ref7
Lock to Ref8
Hold Over
Hardware Reference Selection and Mode Control
© Copyright 2001 The Connor-Winfield Corp. All Rights Reserved
Preliminary Data Sheet #: TM061
Sel3
0
0
0
0
0
0
0
0
1
1
Table 12
Sel2
0
0
0
0
1
1
1
1
0
0
Page 41 of 48
Pin
Sel1
Specifications subject to change without notice
0
0
1
1
0
0
1
1
0
0
Rev: P06 Date: 11/22/04
Sel0
0
1
0
1
0
1
0
1
0
1