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DA6181B.002

5 May, 2011

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

40

140

130

250

ms

MSF Output Pulses

50

170

280

400

160

270

380

600

ms

WWVB Output Pulses

100

400

700

300

600

900

ms

JJY60 Output Pulses

100

400

700

300

600

900

ms

JJY40 Output Pulses

100

400

700

300

600

900

ms