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| 型號： | ICS813078BYILFT |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 8/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VCXO PLL WIRELESS 64TQFP |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 系列： | HiPerClockS™, FemtoClock™ |
| 類型： | 時鐘/頻率發(fā)生器，扇出緩沖器（分配），抖動衰減器，多路復(fù)用器 |
| PLL： | 是 |
| 主要目的： | 無線基礎(chǔ)架構(gòu)應(yīng)用 |
| 輸入： | LVDS，LVHSTL，LVPECL，晶體 |
| 輸出： | LVPECL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 3:9 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 614.4MHz |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-TQFP 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 64-TQFP-EP（10x10） |
| 包裝： | 帶卷 (TR) |
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ICS813078I
FEMTOCLOCKS VCXO-PLL FREQUENCY GENERATOR
FEMTOCLOCKS VCXO-PLL FREQUENCY GENERATOR
16
ICS813078BYI REV. A OCTOBER 6, 2008
Application Information
VCXO-PLL EXTERNAL COMPONENTS
Choosing the correct external components and having a proper
printed circuit board (PCB) layout is a key task for quality operation
of the VCXO-PLL. In choosing a crystal, special precaution must
be taken with the package and load capacitance (CL). In addition,
frequency, accuracy and temperature range must also be
considered. Since the pulling range of a crystal also varies with
the package, it is recommended that a metal-canned package like
HC49 be used. Generally, a metal-canned package has a larger
pulling range than a surface mounted device (SMD). For crystal
selection information, refer to the VCXO Crystal Selection
Application Note.
The crystal’s load capacitance CL characteristic determines its
resonating frequency and is closely related to the VCXO tuning
range. The total external capacitance seen by the crystal when
installed on a board is the sum of the stray board capacitance, IC
package lead capacitance, internal varactor capacitance and any
installed tuning capacitors (CTUNE).
If the crystal CL is greater than the total external capacitance, the
VCXO will oscillate at a higher frequency than the crystal
specification. If the crystal CL is lower than the total external
capacitance, the VCXO will oscillate at a lower frequency than the
crystal specification. In either case, the absolute tuning range is
reduced. The correct value of CL is dependant on the
characteristics of the VCXO. The recommended CL in the Crystal
Parameter Table balances the tuning range by centering the
tuning curve.
The VCXO-PLL Loop Bandwidth Selection Table shows RS, CS
and CP values for recommended high, mid and low loop bandwidth
configurations. The device has been characterized using these
parameters. For other configurations, refer to the Loop Filter
Component Selection for VCXO Based PLLs Application Note.
The crystal and external loop
filter components should be
kept as close as possible to the
device. Loop filter and crystal
traces should be kept short and
separated from each other.
Other signal traces should be
kept separate and not run
underneath the device, loop
filter or crystal components.
VCXO Characteristics Table
VCXO-PLL Loop Bandwidth Selection Table
Crystal Characteristics
LF0
LF1
ISET
XTAL_IN
XTAL_OUT
RS
C
S
C
P
R
SET
C
TUNE
C
TUNE
30.72MHz
Symbol
Parameter
Typical
Units
kVCXO
VCXO Gain
9.3
kHz/V
CV_LOW
Low Varactor Capacitance
14.7
pF
CV_HIGH
High Varactor Capacitance
7.5
pF
Bandwidth
Crystal Frequency (MHz)
MV
RS (k)CS (F)
CP (F)
RSET (k)
8.5Hz (Low)
30.72
384
20
10
0.1
10
85Hz (Mid)
30.72
192
20
10
0.01
2.0
22.2kHz (High)
30.72
1
30
0.01
0.00001
2.2
Symbol
Parameter
Test Conditions
Minimum
Typical
Maximum
Units
Mode of Oscillation
Fundamental
fN
Frequency
30.72
MHz
fT
Frequency Tolerance
±20
ppm
fS
Frequency Stability
±20
ppm
Operating Temperature Range
-40
+85
0C
CL
Load Capacitance
10
pF
CO
Shunt Capacitance
4
pF
CO / C1
Pullability Ratio
220
240
ESR
Equivalent Series Resistance
20
Drive Level
1mW
Aging @ 25 0C
±3 per year
ppm
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS813078I | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCKS? VCXO-PLL FREQUENCY GENERATOR FOR WIRELESS INFRASTRUCTURE EQUIPMENT |
| ICS813252CKI-02LF | 功能描述:IC MULTIPLIER VCXO PLL 32-VFQFPN RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™, FemtoClock™ 標(biāo)準(zhǔn)包裝:27 系列:Precision Edge® 類型:頻率合成器 PLL:是 輸入:PECL，晶體 輸出:PECL 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無/是 頻率 - 最大:800MHz 除法器/乘法器:是/無 電源電壓:3.135 V ~ 5.25 V 工作溫度:0°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
| ICS813252CKI-02LFT | 功能描述:IC MULTIPLIER VCXO PLL 32-VFQFPN RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™, FemtoClock™ 標(biāo)準(zhǔn)包裝:27 系列:Precision Edge® 類型:頻率合成器 PLL:是 輸入:PECL，晶體 輸出:PECL 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無/是 頻率 - 最大:800MHz 除法器/乘法器:是/無 電源電壓:3.135 V ~ 5.25 V 工作溫度:0°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
| ICS813252I-02 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:VCXO JITTER ATTENUATOR & FEMTOCLOCK? MULTIPLIER |
| ICS813253BGLF | 功能描述:IC ATTENUATOR/XLATOR 24TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™, FemtoClock™ 標(biāo)準(zhǔn)包裝:27 系列:Precision Edge® 類型:頻率合成器 PLL:是 輸入:PECL，晶體 輸出:PECL 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無/是 頻率 - 最大:800MHz 除法器/乘法器:是/無 電源電壓:3.135 V ~ 5.25 V 工作溫度:0°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
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