Figure - 5 Reference Switch with TIE Control Blo" />
參數(shù)資料
型號: IDT82V3012PVG8
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 5/32頁
文件大小: 0K
描述: IC PLL WAN T1/E1/OC3 DUAL 56SSOP
標(biāo)準(zhǔn)包裝: 1,000
類型: 時鐘/頻率發(fā)生器,多路復(fù)用器
PLL:
主要目的: 以太網(wǎng),SONET/SDH,Stratum,T1/E1/OC3
輸入: 時鐘
輸出: CMOS,LVDS,TTL
電路數(shù): 1
比率 - 輸入:輸出: 2:12
差分 - 輸入:輸出: 無/是
頻率 - 最大: 32.768MHz
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 56-BSSOP(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 56-SSOP
包裝: 帶卷 (TR)
其它名稱: 82V3012PVG8
Functional Description
13
February 6, 2009
IDT82V3012
T1/E1/OC3 WAN PLL WITH DUAL REFERENCE INPUTS
Figure - 5 Reference Switch with TIE Control Block Enabled
Figure - 6 Reference Switch with TIE Control Block Disabled
2.7
DPLL BLOCK
As shown in Figure - 7, the DPLL Block consists of a Phase Detector,
a Limiter, a Loop Filter, a Digital Control Oscillator and Divider.
2.7.1
PHASE DETECTOR (PHD)
In the Normal mode, the Phase Detector compares the virtual
reference signal from the TIE Control Circuit with the feedback signal
from the Frequency Select Circuit, and outputs an error signal
corresponding to the phase difference. This error signal is sent to the
Limiter circuit for phase slope control.
In the Freerun or Holdover mode, the Frequency Select Circuit, the
Phase Detector and the Limiter are inactive, and the input reference
signal is not used.
2.7.2
LIMITER
The Limiter is used to limit the phase slope. It ensures that the
maximum output phase slope is limited to 5 ns per 125 s for all input
transient conditions. This well meets the AT&T TR62411 and Telcordia
GR-1244-CORE specifications, which specify the maximum phase slope
of 7.6 ns per 125 s and 81 ns per 1.326 ms respectively.
Input Clock
Ref1
Ref2
Time = 0.00 s
Time = 0.25 s
Time = 0.50 s
Time = 0.75 s
Time = 1.0 s
Time = 1.25 s
Time = 1.50 s
Time = 1.75 s
Output Clock
Input Clock
Ref1
Ref2
Time = 0.00 s
Time = 0.25 s
Time = 0.50 s
Time = 0.75 s
Time = 1.0 s
Time = 1.25 s
Time = 1.50 s
Time = 1.75 s
Output Clock
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