DIR1701

SLAS331 – APRIL 2001

10

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unlock flag minimum pulse width time

CASE-A when PLL is unlocked

When the PLL is unlocked, the UNLOCK flag pin is HIGH and the audio data output DOUT becomes LOW

the latest tracked frequency.

If an S/PDIF signal is connected again in this unlock period, the bit rate is changed to the incoming signal

frequency, after at least 1 ms (before the UNLOCK flag goes LOW). The CKTRNS pin indicates validity of SCKO.

When CKTRNS is HIGH, the frequency of SCKO, BCKO, and LRCKO is in transition between states.

2

1

L

H

Mute

tUNL>200 ms

S/PDIF Signal Bit Rate

S/PDIF Signal Starts Again

New Bit Rate

tTRNS < 1 ms

UNLOCK

LRCKO

CKTRANS

BCKO

DOUT

Figure 5. UNLOCK Flag Minimum Pulse Width Time for PLL Unlocked