LTC455GU
Ceramic Filter
1.Scope
This specification shall cover the characteristics of the ceramic filter with 455KHz.
2.Part No. :
LTC455GU
3.Electrical Specification
Item
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
Center Frequency (Fo)
Insertion Loss(dB)
Ripple (dB)
Band Width (6dB)
Selectivity (40dB)
Stop Band Attenuation
Input / Output Impedance
Temperature Coefficient of
Center Frequency
6.0dB max.
2.0dB max.( ±5KHz)
±4.5KHz min.
±10.0Khz max.
25dB min.(Fo ± 100KHz)
1.5KΩ
± 50ppm/℃ max.
(-20℃ to +80℃)
Specifications
455KHz ±1.5KHz
A). Center Frequency shall be defined as the central value of the
band width at 6dB.
B). Temperature coefficient of center frequency shall be defined
as the average of the central frequency shift throughout the
specified temperature range.
4.Measurement
4-1 Environmental Condition
Measurement shall be carried out at the reference temperature of 25℃±2
℃.
It shall be possibly done at 5℃ to 35℃ unless it is questionable.
4-2 Measuring Circuit
Note.:
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LTC455GU
Ceramic Filter
5.Dimensions (Unit : mm)
6.ENVIRONMENTAL CHARACTERISTICS
6-1 Humidity
Keep the filter at 40℃ ± 2℃ and 90 to 95% RH for minimum 8 hours.
Then, release the filter into the room conditions for 1 hour prior to the
measurement. It shall fulfill the electrical specifications in section 3.
6-2 Vibration
Subject the filter to the vibration for 1 hour each in X, Y and Z axes with
the amplitude of 1.0mm at 10 to 55Hz. It shall fulfill the electrical
specifications in section 3.
6-3 Mechanical Shock
Drop the filter randomly onto a concrete floor from the height of 30cm 3
times. It shall fulfill the electrical specifications in section 3.
6-4 Solder Heat – Resistance
The filters shall be assembled to the 1mm “through-hole” P.C. board and
placed in a solder solution (SU 63% & PB 37%) at 250 ± 10℃ twice for
duration of 3 seconds. After removal from the solder solution chamber, the
filters may be cleaned with chloroform and left for more that 24 hours at
the room temperature. It shall fulfill the electrical specifications in section 3.
6-5 High Temperature Exposure
Put subject filter to chamber at 80 ± 5℃ for 96 ± 4 hours. Then, release
the filter into the room condition for 1 hour prior to the measurement. It
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LTC455GU
Ceramic Filter
shall meet the electrical specifications in section 3.
6-6 Low Temperature Exposure
Put subject filter to –20 ± 5℃ for 96 ± 4 hours. Then, release the filter into
the room conditions for 1 hour prior to the measurement. It shall fulfill the
electrical specifications in section 3.
6-7 Temperature Cycling
Subject filter is put into low temperature of -20℃ for 30 minutes, followed
by a high temperature of +85℃ for 30 minutes. Cycling shall be repeated
5 times with a time interval of 15 minutes under room conditions. Then,
release the filter into the room conditions for 1 hour prior to the
measurement. It shall fulfill the electrical specifications in section 3.
6-8 Lead Fatigue
6-8-1 Pulling Test
Weight 3Kg along to the direction of lead without a sudden shock. The
filter shall show no evidence of damage and shall satisfy all the initial
characteristics.
6-8-2 Bending Test
Lead shall be subject to withstand against 90°bending in the direction of
thickness. This operation shall be done towards both directions. The filter
shall show no evidence of damage and shall satisfy all the initial electrical
characteristics.
7.PACKAGE FORM
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