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S1T8825B01-R0B0 Datasheet(PDF) 9 Page - Samsung semiconductor

Part # S1T8825B01-R0B0
Description  1.3GHZ DUAL PLL
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Manufacturer  SAMSUNG [Samsung semiconductor]
Direct Link  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

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1.3GHZ DUAL PLL
S1T8825B
9
LOCK DETECTOR OUTPUT
When the phase comparator detects a phase difference, LD (Pin5) outputs “L”.
When the phase comparator locks, LD outputs “H”. On standby, it outputs “H”.
When T is less than 2/fosc (T<2 /fosc ) for more than three cycles of reference divider output as in the figure below,
the lock detector outputs “H”.
fosc: OSCI operating frequency (LOCAL OSC).
T: time difference of the pulse between reference divider output and channel divider output.
PROGRAMMABLE STANDBY MODE (SB1, SB2, SBR)
Standby mode can be controlled by 3-control bits such as SB1, SB2 and SBR. SB1 and SB2 can control the
standby mode of channel 1 and channel2. The “SBR” bit can do ON / OFF control of reference divider.
Figure 3. Lock Detector Output
Control Bit
Standby Mode State
SB1
SB2
SBR
CH1
CH2
REF
Mode Status
00
×
ON
ON
ON
Inter locking Mode
01
×
ON
OFF
ON
CH1 Locking Mode
10
×
OFF
ON
ON
CH2 Locking Mode
1
1
0
OFF
OFF
ON
REF On Mode
1
1
1
OFF
OFF
OFF
Standby Mode
B
A
T
T<2/fosc
Reference
Divider output
Channel
Divider output
Charge pump
output
Lock detector
output
A =
(s)
B =
(s)
Number of divisions by reference divider
fosc
2
fosc


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