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參數(shù)資料
| 型號(hào)： | DW2501-G |
| 廠商： | DYNEX SEMICONDUCTOR LTD |
| 元件分類： | 聲表面波濾波器 |
| 英文描述： | 1 FUNCTIONS, SAW-VIDEO/SOUND FILTER |
| 文件頁(yè)數(shù)： | 3/8頁(yè) |
| 文件大小： | 160K |
| 代理商： | DW2501-G |
Vestigial Sideband Filters
3/8
www.dynexsemi.com
OPERATING NOTES
1. Coupling Capacitors
Although there is no DC path within the SAW filter it is advisable
to keep any applied DC voltage to <100mV.
Prolonged exposure to voltages in excess of this may adversely
affect the life of the filter. Short-term exposure to voltages up to
30 volts should not cause any problems.
2. Temperature Effects
The characteristics of SAW filters of this type behave in a simple
predictable manner with temperature. The temperature
coefficient of frequency is -90ppm/
°C. For example the rejection
at 45
°C and 40.15MHz will be the same as that at 25°C and
40.22MHz.
3. Mounting Precautions
In order to achieve the quoted rejections it is important to prevent
excessive direct breakthrough signals. Normal high frequency
precautions such as the use of continuous ground plane and
short component leads are necessary. It is most important that
the SAW filter is well grounded. All the earth leads on the
package should be connected to the ground plane by short
connections - plated through holes are ideal.
Direct breakthrough signals produce two main effects:
Specified out of band rejections not achieved
Passband ripple is excessive
A simple method to check that the grounding is adequate is to
connect the package directly to the ground plane temporarily,
and check that the frequency response does not change.
PLOTS
Fig.1 - DW1404-G
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