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參數(shù)資料
| 型號(hào)： | IDT5V925QI |
| 廠(chǎng)商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類(lèi)： | XO, clock |
| 英文描述： | PROGRAMMABLE CLOCK GENERATOR |
| 中文描述： | 160 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| 封裝： | 0.150 INCH, QSOP-16 |
| 文件頁(yè)數(shù)： | 6/7頁(yè) |
| 文件大小： | 52K |
| 代理商： | IDT5V925QI |
6
INDUSTRIAL TEMPERATURE RANGE
IDT5V925
PROGRAMMABLE CLOCK GENERATOR
By connecting one of the 49FCT3505 outputs to the FB input of the 5V925
, the propagation delay fromCLKIN to the output of the 49FCT3505 will be
nearly zero. To ensure PLL stability, only one 49FCT3505 should be
included between Q/N and FB.
One of the questions often asked is what is the accuracy of our clock
generators In applications where clock synthesizers are used, the terms
frequency accuracy and frequency error are used interchangeably.
Here, frequency accuracy (or error) is based on two factors. One is the
input frequency and the other is the multiplication factor. Clock multipliers
(or synthesizers) are governed by the equation:
Output Frequency = (M)*Input Frequency
N
where “M” is the feedback divide and “N” is the reference divide. If the
ratio of M/N is not an integer, then the output frequency will not be an exact
multiple of the input. On the other hand, if the ratio were a whole number,
the output clock would be an exact multiple of the input. In the case of 5V925,
since the reference divide (“N”) is “1”, the equation is a strong function of
the feedback divide (“M”). In addition, since the feedback is an integer, the
output frequency error (or accuracy) is merely a function of how accurate
the input is. For instance, 5V925 could accept two forms of input, one from
a crystal oscillator (see Figure 1) and the other froma crystal (see Figure
3). By using a 20MHz clock with a multiplication factor of 5 (with an accuracy
of ±30 parts per mllion), one can easily have three copies of 100MHz of
clock with ±30PPM of accuracy. Frequency accuracy is defined by the
following equation:
Accuracy = (Measured Freq. – Nomnal Freq.)
Nomnal Frequency
where measured frequency is the average frequency over certain
number of cycles (typically 10,000) and the nomnal frequency is the
desired frequency.
CLKIN
X
2
X
1
S
0
S
1
Q
0
Q
1
Q
2
Q/N
XTAL
OSC
5V925
FB
Figure 3
The second way to drive the input of the 5V925 is via an external crystal.
When connecting an external crystal to pins 5 and 6, the X
2
pin must be
shorted to the CLKIN (pin 7) as shown in Figure 3. For best accuracy, a
parallel resonant crystal with a crystal load capacitance rating of 15pF
should be used. To reduce the parasitic between the external crystal and
the 5V925 , it is recommended to connect the crystal as close as possible
to the X
1
and X
2
pins.
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