- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373784 > ZL30409 (Zarlink Semiconductor Inc.) T1/E1 System Synchronizer with Stratum 3 Holdover PDF資料下載
參數(shù)資料
| 型號： | ZL30409 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | T1/E1 System Synchronizer with Stratum 3 Holdover |
| 中文描述： | T1/E1的系統(tǒng)同步與地層3緩繳暫繳稅 |
| 文件頁數(shù)： | 18/32頁 |
| 文件大小： | 483K |
| 代理商： | ZL30409 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁當前第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁
ZL30409
Data Sheet
18
Zarlink Semiconductor Inc.
Lock Indicator
The LOCK pin toggles at a random rate when the PLL is frequency locked to the input reference. In Figure 11 the
RC-time-constant circuit can be used to hold the high state of the LOCK pin.
Once the PLL is frequency locked to the input reference, the minimum duration of LOCK pin’s high state would be
32ms and the maximum duration of LOCK pin’s low state would not exceed 1 second. The following equations can
be used to calculate the charge and discharge times of the capacitor.
t
C
= - R
D
C ln(1 – V
T+
/V
DD
) = 240
μ
s
t
C
= Capacitor’s charge time
R
D
= Dynamic resistance of the diode (100
)
C = Capacitor value (1
μ
F)
V
T+
= Positive going threshold voltage of the
Schmidt Trigger (3.0 V)
V
DD
= 3.3 V
t
D
= - R C ln(V
T-
/V
DD
) = 1.65 seconds
t
D
= Capacitor’s discharge time
R = Resistor value (3.3 M
)
C = Capacitor value (1
μ
F)
V
T-
= Negative going threshold voltage of the
Schmidt Trigger (2.0 V)
V
DD
= 3.3 V
Figure 11 - Time-constant Circuit
A digital alternative to the RC-time-constant circuit is presented in Figure 12. The circuit in Figure 12 can be used to
generate a steady lock signal. The circuit monitors the ZL30409’s LOCK pin, as long as it detects a positive pulse
every 1.024 seconds or less, the Advanced Lock output will remain high. If no positive pulse is detected on the
LOCK output within 1.024 seconds, the Advanced LOCK output will go low.
R=3.3M
IN4148
LOCK
74HC14
74HC14
C=1
μ
f
+
LOCK
ZL30409
相關PDF資料 |
PDF描述 |
|---|---|
| ZL30410 | CONN HDR INVERSE 30POS 5ROW VERT |
| ZL30410QCC | CONN SOCKET R/A 4R0W 24POS SLD |
| ZL30414 | SONET/SDH Clock Multiplier PLL |
| ZL30414QGC | SONET/SDH Clock Multiplier PLL |
| ZL30414QGC1 | SONET/SDH Clock Multiplier PLL |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ZL30409/DDA | 制造商:Microsemi Corporation 功能描述: |
| ZL30409/DDB | 制造商:Microsemi Corporation 功能描述: |
| ZL30409/DDE | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1 System Synchronizer with Stratum 3 Holdover |
| ZL30409/DDF | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1 System Synchronizer with Stratum 3 Holdover |
| ZL30409_06 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:T1/E1 System Synchronizer with Stratum 3 Holdover |
發(fā)布緊急采購，3分鐘左右您將得到回復。