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參數資料
| 型號： | TB2118FG |
| 廠商： | Toshiba Corporation |
| 英文描述： | High Speed PLL For DTS |
| 中文描述： | 高高速PLL為DTS |
| 文件頁數： | 11/20頁 |
| 文件大?。?/td> | 348K |
| 代理商： | TB2118FG |
TB2118FG
2006-04-12
11
4. Control of phase comparator and charge pumps
The phase comparator compares the phase difference between the reference frequency signal (f
REF
) and the
programmable counter divisor output (f
SIG
) and outputs the result.
The constant current driver block outputs phase error signals as a current.
1) Setting charge pumps and op
amps (OPSEL)
The OPSEL bit is used to select a charge pump and an op
amp.
OPSEL
Charge Pump (CP) Output
Op
Amp
AM CP Output
FM CP Output
0
DOFM
FM amp
Hz
DO
1
DOAM
AM amp
DO
Hz
Hz = high impedance
DO = tri
state output
2) Setting current value (CRO)
●
AM / FM = "1" (AM
IN
input)
●
AM / FM = "0" (FM
IN
input)
CR1
CR0
AM CP Out Output Current
CR1
CR0
FM CP Out Output Current
0
0
±0.3mA
0
0
±250μA
0
1
±0.5mA
1
0
±5mA
3) Connection example (the filter circuit is an example for reference. Check and design depending on the desired
characteristics for your set.)
20
AM
CP OUT
V
T
1
1
0.47 μF 15 k
18
19
0.047 μF 3.3 k
100 pF
8200 pF
FM
CP OUT
V
T
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