lc72131m Sanyo Semiconductor Corporation, lc72131m Datasheet - Page 18

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lc72131m

Manufacturer Part Number
lc72131m
Description
Am/fm Pll Frequency Synthesizer
Manufacturer
Sanyo Semiconductor Corporation
Datasheet

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Unlock Detection Timing
1. Unlock Detection Determination Timing
Unlocked state detection is performed in the reference frequency (fref) period (interval). Therefore, in principle,
unlock determination requires a time longer than the period of the reference frequency. However, immediately after
changing the divisor N (frequency) unlock detection must be performed after waiting at least two periods of the
reference frequency.
For example, if fref is 1 kHz, i.e., the period is 1 ms, after changing the divisor N, the system must wait at least 2 ms
before checking for the unlocked state.
Figure 1 Unlocked State Detection Timing
Figure 2 Circuit Structure
LC72131, 72131M
No. 4921-18/23

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