- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄359234 > MT9046 (Zarlink Semiconductor Inc.) T1/E1 System Synchronizer with Holdover PDF資料下載
參數(shù)資料
| 型號： | MT9046 |
| 廠商： | Zarlink Semiconductor Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | T1/E1 System Synchronizer with Holdover |
| 中文描述： | T1/E1的系統(tǒng)同步的緩繳暫繳稅 |
| 文件頁數(shù)： | 6/34頁 |
| 文件大?。?/td> | 508K |
| 代理商： | MT9046 |
第1頁第2頁第3頁第4頁第5頁當(dāng)前第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頁第33頁第34頁
MT9046
Data Sheet
6
Zarlink Semiconductor Inc.
Figure 3 - TIE Corrector Circuit
As shown in Figure 3, the TIE Corrector Circuit receives one of the two reference (PRI or SEC) signals, passes the
signal through a programmable delay line, and uses this delayed signal as an internal virtual reference, which is
input to the DPLL. Therefore, the virtual reference is a delayed version of the selected reference.
During a switch from one reference to the other, the State Machine first changes the mode of the device
from Normal to Holdover. In Holdover Mode, the DPLL no longer uses the virtual reference signal, but generates an
accurate clock signal using storage techniques. The Compare Circuit then measures the phase delay between the
current phase (feedback signal) and the phase of the new reference signal. This delay value is passed to the
Programmable Delay Circuit (See Figure 3). The new virtual reference signal is now at the same phase position as
the previous reference signal would have been if the reference switch not taken place. The State Machine then
returns the device to Normal Mode.
The DPLL now uses the new virtual reference signal, and since no phase step took place at the input of the DPLL,
no phase step occurs at the output of the DPLL. In other words, reference switching will not create a phase change
at the input of the DPLL, or at the output of the DPLL.
Since internal delay circuitry maintains the alignment between the old virtual reference and the new virtual
reference, a phase error may exist between the selected input reference signal and the output signal of the DPLL.
This phase error is a function of the difference in phase between the two input reference signals during reference
rearrangements. Each time a reference switch is made, the delay between input signal and output signal will
change. The value of this delay is the accumulation of the error measured during each reference switch.
The programmable delay circuit can be zeroed by applying a logic low pulse to the TIE Circuit Reset (TCLR) pin. A
minimum reset pulse width is 300 ns. This results in a phase alignment between the input reference signal and the
output signal as shown in Figure 14. The speed of the phase alignment correction is limited to 5 ns per 125 us, and
convergence is in the direction of least phase travel.
The state diagram of Figure 7 indicates which state changes the TIE Corrector Circuit is activated.
Digital Phase Lock Loop (DPLL)
As shown in Figure 4, the DPLL of the MT9046 consists of a Phase Detector, Limiter, Loop Filter, Digitally
Controlled Oscillator, and a Control Circuit.
Programmable
Delay Circuit
Control Signal
Delay Value
TCLR
Resets Delay
Compare
Circuit
TIE Corrector
Enable
from
State Machine
Control
Circuit
Feedback
Signal from
Frequency
Select MUX
PRI or SEC
from
Reference
Select Mux
Virtual
Reference
to DPLL
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT9046AN | T1/E1 System Synchronizer with Holdover |
| MT90503 | 2048VC AAL1 SAR |
| MT90503AG | CLIP, STRAIN RELIEF, 50WAY; For use with:820 Series Tripolarized Wiremount Sockets; Ways, No. of:50; Material:Metal; Connector type:Strain Relief RoHS Compliant: Yes |
| MT90520 | 8-Port Primary Rate Circuit Emulation AAL1 SAR |
| MT90520AG | 8-Port Primary Rate Circuit Emulation AAL1 SAR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT9046AN | 制造商:Microsemi Corporation 功能描述: |
| MT9046AN1 | 制造商:Microsemi Corporation 功能描述:FRAMER E1 /T1 3.3V 48SSOP - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SYNCHRONIZER T1/E1 48SSOP 制造商:Microsemi Corporation 功能描述:IC SYNCHRONIZER T1/E1 48SSOP |
| MT9046ANR1 | 制造商:Microsemi Corporation 功能描述:FRAMER E1 /T1 3.3V 48SSOP - Tape and Reel 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC SYNCHRONIZER T1/E1 48SSOP 制造商:Microsemi Corporation 功能描述:IC SYNCHRONIZER T1/E1 48SSOP |
| MT9048 | 制造商:DBLECTRO 制造商全稱:DB Lectro Inc 功能描述:Standard Type |
| MT90489 | 制造商: 功能描述: 制造商:undefined 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。