SA.22c Rubidium Oscillator
Designer Reference and User Guide Revision D
19
Pin
Signal
Type
Function
15
VSS
GND
Power and signal ground (All ground pins must be connected)
16
VSS
GND
Power and signal ground (All ground pins must be connected)
17
VSS
GND
Power and signal ground (All ground pins must be connected)
18
VSS
GND
Power and signal ground (All ground pins must be connected)
19
1PPS IN
Input
1PPS input, positive edge triggered
20
1PPS OUT
Output
1PPS output, may be enabled/disabled digitally
21
Lock
Output
If low, then the SA.22c is locked
22
Not available
23
VSS
GND
Power and signal ground (All ground pins must be connected)
24
FACMOS
Output
Frequency ACMOS signal output
25
VSS
GND
Power and signal ground (All ground pins must be connected)
26
SINE
Output
Sine signal output (50 ?)
J3, J4, J5, and J6 are SMA connectors used for signal outputs (J4 is a signal input) provided by the SA.22c.
The following table lists the SMA connectors' signal information.
Table 7 • SMA Connectors' Signal Information
SMA
Signal
Type
Function
J3
1PPS OUT
Output
1PPS output, may be enabled
/disabled digitally
J4
1PPS IN
Input
1PPS input, positive edge triggered
J5
FACMOS
Output
Frequency ACMOS signal output
J6
SINE
Output
Sine signal output (50 Ω)
J7 is a 9-pin D-Sub connector used for transmitting/receiving data to and from the SA.22c through the
MSIP. The following table lists the D-Sub connector pin configuration.
Warning: When using J3, J4, J5, and J6, it is required that J2 must not be connected. Having J2 connected
will cause a loading effect on J3, J4, J5, and J6, which results in degraded signal integrity.
Table 8 • 9 Pin D-Sub Connector (J7)
Pin
Signal
Type
Function
1
Not available
2
DOUT
Output
UART data out at ACMOS logic levels
3
DIN
Input
UART data in to SA.22c
4
Not available
5
VSS
GND
Signal ground
6
Not available
7
Not available
8
Not available
9
Not available
5.3
Options for Supplying Power to the Adapter Test Board
The SA.22c adapter test board design allows three power-supplying options.
The following figures show the block diagrams of the three different options for powering and setting up
