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参数资料
| 型号： | ICS81006AKLFT |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 40 MHz, OTHER CLOCK GENERATOR, QCC20 |
| 封装： | 4 X 4 MM, 0.95 MM HEIGHT, ROHS COMPLIANT, MO-220, VFQFN-20 |
| 文件页数： | 2/14页 |
| 文件大小： | 163K |
| 代理商： | ICS81006AKLFT |
81006AK
www.icst.com/products/hiperclocks.html
REV. A JANUARY 4, 2006
10
Integrated
Circuit
Systems, Inc.
ICS81006
VCXO-TO-6 LVCMOS OUTPUTS
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w
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LV
C
V
0
=4
.
5
1F
p
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h
g
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HV
C
V
3
.
3
=6
.
9
2F
p
TABLE 6. VARACTOR PARAMETERS
FORMULAS
(
) (
)
() (
)
Low
V
S
L
Low
V
S
L
Low
V
S
L
Low
V
S
L
Low
C
_
2
_
1
_
2
_
1
+
+
=
(
) (
)
() (
)
High
V
S
L
High
V
S
L
High
V
S
L
High
V
S
L
High
C
_
2
_
1
_
2
_
1
+
+
=
6
0
1
0
1
0
10
1
2
1
2
1
)
(
+
+
=
C
TPR
Range
Pull
Total
High
Low
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.
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.
Absolute Pull Range (APR) = Total Pull Range – (Frequency Tolerance + Frequency Stability + Aging)
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.
() ()
pf
C
Low
7
.
9
4
.
15
4
0
4
.
15
4
0
4
.
15
4
0
4
.
15
4
0
=
+
+
=
() ()
() (
)
pf
C
High
8
.
16
6
.
29
4
0
6
.
29
4
0
6
.
29
4
0
6
.
29
4
0
=
+
+
=
ppm
pF
TPR
5
.
226
10
4
8
.
16
1
220
2
1
4
7
.
9
1
220
2
1
6
=
+
+
=
TPR = ±113.25ppm
APR = 113.25ppm – (20ppm + 20ppm + 15ppm) = ±58.25ppm
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 (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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS81006AKT | 制造商:ICS 制造商全称:ICS 功能描述:VCXO-TO-6 LVCMOS OUTPUTS |
| ICS81006I | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:VCXO-TO-LVCMOS OUTPUTS |
| ICS810-06I | 制造商:ICS 制造商全称:ICS 功能描述:VCXO-TO-6 LVCMOS OUTPUTS |
| ICS810251AGI-08LF | 功能描述:IC VCXO SYNC ETH ATTEN 16TSSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
| ICS810251AGI-08LFT | 功能描述:IC VCXO ATTEN SYNC ETH 16TSSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
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