DA6181B.003
17 September, 2014
TYPICAL APPLICATION (Continued)
Note 6: Time Signal Software’s Pulse Width Recognition Limits
The typical output pulse width specifications are presented in the electrical characteristics section on page 3.
Due to process variations the typical output pulse width can differ from these. Additionally the output pulse
widths can vary even more depending on the receiving antenna signal strength versus noise and disturbance
conditions. That is why it is important that the time signal decoding software has appropriate tolerance limits for
managing the output pulse width variations successfully. The table 5 presents recommended software pulse
width tolerance limits for recognizing pulses of different time signals.
Table 5. Recommended Software Pulse Width Recognition Limits for Different Time Signals
Parameter
Symbol
Min
Max
Unit
DCF77 Output Pulses
T 100ms
T 200ms
T 100ms
T 200ms
T 300ms
T 500ms
T 200ms
T 500ms
T 800ms
T 200ms
T 500ms
T 800ms
T 200ms
T 500ms
T 800ms
40
140
50
130
250
160
270
380
600
300
600
900
300
600
900
300
600
900
ms
MSF Output Pulses
ms
170
280
400
100
400
700
100
400
700
100
400
700
WWVB Output Pulses
JJY60 Output Pulses
JJY40 Output Pulses
ms
ms
ms
9 (14)
MAS [ MICRO ANALOG SYSTEMS ]
