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MT8941B

Advanced T1/CEPT Digital Trunk PLL

Zarlink Semiconductor Inc 

MT8941B

Data Sheet

M

M

Mode of

S

S

Operation

0

1

Function

X

0 NORMAL Provides the T1 (1.544 MHz) clock synchronized

to the falling edge of the input frame pulse (F0i).

0

1 DIVIDE-1 DPLL #1 divides the CVb input by 193. The

divided output is connected to DPLL #2.

1

1 DIVIDE-2 DPLL #1 divides the CVb input by 256. The

divided output is connected to DPLL #2.

Note: X: indicates don’t care

Table 1 - Major Modes of DPLL #1

M

M

Mode of

S

S

Operation

0

1

Function

0

0

NORMAL Provides CEPT/ST-BUS timing signals locked

to the falling edge of the 8 kHz input signal at

C8Kb.

1

0 FREE-RUN Provides CEPT/ST-BUS timing and framing

signals with no external inputs, except the

master clock.

0

1

SINGLE Provides CEPT/ST-BUS timing signals locked

CLOCK-1 to the falling edge of the 8 kHz internal signal

provided by DPLL #1.

1

1

SINGLE Provides CEPT/ST-BUS timing signals locked

CLOCK-2 to the falling edge of the 8 kHz internal signal

provided by DPLL #1.

Table 2 - Major Modes of DPLL #2

6

Zarlink Semiconductor Inc.

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