参数资料
型号: IDT82V3002APV
厂商: INTEGRATED DEVICE TECHNOLOGY INC
元件分类: 通信及网络
英文描述: WAN PLL WITH DUAL REFERENCE INPUTS
中文描述: SPECIALTY TELECOM CIRCUIT, PDSO56
封装: SSOP-56
文件页数: 11/28页
文件大小: 390K
代理商: IDT82V3002APV
11
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS INDUSTRIAL TEMPERATURE RANGE
Figure - 4 State Control Diagram
3.1.1
NORMAL MODE
Normal Mode is typically used when a slave clock source
synchronized to the network is required.
In this mode, the IDT82V3002A provides timing (C1.5o,
C3o
, C2o,
C4o
, C6o, C8o,
C16o
and
C32o
) and synchronization (
F0o
, F8o,
F16o
,
F32o
, TSP, RSP) signals, which are synchronous to the input reference.
The input reference signals have a nominal frequency of 8 kHz, 2.048
MHz or 1.544 MHz.
From a reset condition, the IDT82V3002A will take 30 seconds at
most to make the output signals synchronous (phase locked) to the input
reference.
Whenever the IDT82V3002A enters Normal Mode, it will give an
indication by setting the NORMAL pin to high.
3.1.2
FAST LOCK MODE
Fast Lock Mode is a submode of Normal Mode. It is used to allow the
IDT82V3002A to lock to a reference more quickly than Normal Mode will
do. Typically, the DPLL will lock to the input reference within 500 ms if
the FLOCK pin is high.
3.1.3
HOLDOVER MODE
Holdover Mode is typically used for short duration (e.g., 2 seconds)
while network synchronization is temporarily disrupted.
In Holdover Mode, the IDT82V3002A provides timing and
synchronization signals, which are not locked to the external reference
signal but based on storage techniques. The storage value is
determined while the device is in Normal Mode and locked to the
external reference signal.
In Normal Mode, when the output signal is locked to the input
reference signal, a numerical value corresponding to the output
frequency is stored alternately in two memory locations every 30 ms.
When the device is switched into Holdover Mode, the stored value in
memory from between 30 ms and 60 ms is used to set the output
frequency of the device.
The frequency accuracy in Holdover Mode is ±0.025 ppm, which
S1
Normal
Mode_sel1 = 0
Mode_sel0 = 0
S3
Holdover
Mode_sel1 = 0
Mode_sel0 = 1
S0
Freerun
Mode_sel1 = 1
Mode_sel0 = 0
(Invalid Input Reference Signal)
AuoTEDsabe
AuoTEDsabe
Auto TIE Disable
AuoTEDsabe
AutoTIE Disable
AuoTEDsabe
TEDsabe(TE_en=L
AuoTEDsabe
TEEnabe(TE_en=H
Reset *
S4
Short Time Holdover
Mode_sel1 = 0
Mode_sel0 = X
At INslTaset
NoIN_se Tansen
TEEnabe(TE_en=H
TDbNNersn
IN_se Transient
Auto TIE Disable
S2
Auto - Holdover
Mode_sel1 = 0
Mode_sel0 = 0
TIE Enable (TIE_en = H)
TIE Disable (TIE_en = L)
(Valid Input Reference Signal)
(Valid Input Reference Signal)
* Note: After reset, Mode_sel1 and Mode_sel0 should be initially set to '10' or '00'.
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