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參數(shù)資料
| 型號： | S1T8825X01-R0B0 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | OSC 5V SMT 7X5 CMOS PROGRM |
| 中文描述： | 1.1GHz的雙鎖相環(huán) |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 120K |
| 代理商： | S1T8825X01-R0B0 |
S1T8825
1.1GHZ DUAL PLL
10
PRELINIMARY( VER.2.1 )
FILTER SWITCH CONTROL (SW)
The operation mode of the SW terminal is set by bit
“
SW
”
.
SW control is useful for switching the time constant of the loop filter.
Output type of this terminal is an open drain output. High lock mode or normal lock mode can be used, taking
advantage of filter switch control (SW) with the charge pump output current.
When fast lock function can
’
t be used, normal lock mode is available.
CRYSTAL OSCILLATOR CIRCUIT (OSCI, OSCO) AND BUFFER OUT (BO)
External capacitors C1, C2, C3, and C4 are required to set the proper crystal
’
s load capacitance and oscillation
frequency as shown in figure 4. The value of the capacitors is dependent on the crystal chosen.
The BO (Pin9) outputs local oscillation signal with buffer amplifier.
This terminal (Pin9) can be applied to the 2nd mixer input
Control Bits
Operation Mode
(SW and LPF example) The third order LPF
SW
CP1
CP2
0
0
0
Normal Lock Mode
0
0
1
0
1
0
0
1
1
1
0
0
High Lock Mode
1
0
1
1
1
0
1
1
1
Figure 4.
CP1
SW
GND
R
R
R
OSCI
BO
OSCO
1000pF
C3
C2
C4
C2
2'nd MIX
or OPEN
2'nd MIX
or OPEN
Reference Oscillator
OSCI
OSCO
BO
1000pF
1000pF
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