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| 型号： | ICS810001BK-21 |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟及定时 |
| 英文描述： | 810001 SERIES, PLL BASED CLOCK DRIVER, 1 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), QCC32 |
| 封装： | 5 X 5 MM, 0.95 MM HEIGHT, MO-220VHHD-2, VFQFN-32 |
| 文件页数： | 9/22页 |
| 文件大小： | 485K |
| 代理商： | ICS810001BK-21 |
810001BK-21
www.icst.com/products/hiperclocks.html
REV. A AUGUST 12, 2005
17
Integrated
Circuit
Systems, Inc.
ICS810001-21
FEMTOCLOCKSDUAL VCXO VIDEO PLL
PRELIMINARY
The example above will ensure a total pull range of ±113.25
ppm with an APR of ±58.25ppm. Many times, board designers
may select their own crystal based on their application. If the
application requires a tighter APR, a crystal with better pullability
FORMULAS
C
LOW =
(C
L1 + CS1 + CV_LOW) (CL2 + CS2 + CV_LOW)
(C
L1 + CS1 + CV_LOW) + (CL2 + CS2 + CV_LOW)
C
HIGH =
(C
L1 + CS1 + CV_HIGH (CL2 + CS2 + CV_HIGH)
(C
L1 + CS1 + CV_HIGH) + (CL2 + CS2 + CV_HIGH)
C
Low
is the effective capacitance due to the low varactor
capacitance, load capacitance and stray capacitance.
C
Low determines the high frequency component on the
TPR (Total Pull Range).
C
High
is the effective capacitance due to the high varactor
capacitance, load capacitance and stray capacitance.
C
High determines the low frequency component on the
TPR (Total Pull Range).
EXAMPLE CALCULATIONS
Using the tables and figures above, we can now calculate the
TPR and APR of the VCXO using the example crystal
parameters. For the numerical example below there were some
assumptions made. First, the stray capacitance (C
S1, CS2), which
is all the excess capacitance due to board parasitic, is 4pF.
Second, the expected lifetime of the project is 5 years; hence
the inaccuracy due to aging is ±15ppm. Third, though many
boards will not require load tuning capacitors (C
L1, CL2), it is
recommended for long-term consistent performance of the
system that two tuning capacitor pads be placed into every
design. Typical values for the load tuning capacitors will range
from 0 to 4pF.
AbsolutePullRange (APR) = TotalPullRange – (FrequencyTolerance + FrequencyStability + Aging)
TPR =
1
2 C
0/C1 (1+CLOW /C0)
1
2 C
0/C1 (1+CHIGH/C0)
– 106
()
C
LOW =
(0 + 4pF + 15.4pF) (0 + 4pF + 15.4pF)
(0 + 4pF + 15.4pF) + (0 + 4pF + 15.4pF)
= 9.7pF
C
HIGH =
(0 + 4pF + 29.6pF) (0 + 4pF + 29.6pF)
(0 + 4pF + 29.6pF) + (0 + 4pF + 29.6pF)
= 16.8pF
TPR = ±113.25ppm
APR = 113.25ppm – (20ppm + 20ppm + 15ppm) = ±58.25ppm
TPR =
1
2 220 (1+9.7pF/4pF)
1
2 220 (1+16.8pF/4pF)
– 106 = 226.5ppm
()
(C0/C1 ratio) can be used. Also, with the equations above, one
can vary the frequency tolerance, temperature stability, and
aging or shunt capacitance to achieve the required pullability.
ICS810001-21
FEMTOCLOCKS DUAL VCXO VIDEO PLL
TSD
IDT / ICS FEMTOCLOCKS DUAL VCXO VIDEO PLL
ICS810001-21
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS810001BK-21T | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS-TM DUAL VCXO VIDEO PLL |
| ICS810001BK-22LF | 功能描述:IC CLK SYNC DL VCXO PLL 32 VFQFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:HiPerClockS™, FemtoClock™ 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| ICS810001BK-22LFT | 功能描述:IC CLK SYNC DL VCXO PLL 32 VFQFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:HiPerClockS™, FemtoClock™ 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| ICS810001DK-21LF | 功能描述:IC CLK GEN SYNC VCXO DL 32VFQFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:HiPerClockS™, FemtoClock™ 标准包装:1 系列:- 类型:时钟/频率发生器，多路复用器 PLL:是 主要目的:存储器，RDRAM 输入:晶体 输出:LVCMOS 电路数:1 比率 - 输入:输出:1:2 差分 - 输入:输出:无/是 频率 - 最大:400MHz 电源电压:3 V ~ 3.6 V 工作温度:0°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:Digi-Reel® 其它名称:296-6719-6 |
| ICS810001DK-21LFT | 功能描述:IC CLK GEN SYNC VCXO DL 32VFQFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:HiPerClockS™, FemtoClock™ 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
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