LC72131 View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

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LC72131

AM/FM PLL Frequency Synthesizer

SANYO -> Panasonic 

LC72131, 72131M

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.

Figure 1 Unlocked State Detection Timing

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 2 Circuit Structure

No. 4921-18/23

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