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ECS, INC. INTERNATIONAL 1105 S. RIDGEVIEW, OLATHE, KS 66062 • 913-782-7787 • 800-237-1041 • FAX 913-782-6991 • WWW.ECSXTAL.COM
CERAMIC FILTERS CERAMIC FILTERS
LTM455U SERIES 4 ELEMENT CERAMIC FILTER
2.4 1.8 0.8
7
6.54
7
4.3
0.8
4.3
4
3
2
1Connection
Input
Ground
Output
Ground
3
4
2
1
2.4 1.8 0.8
Figure 1) LTM455U – Front, Side and Bottom views
Ultra small size high selectivity type ceramic
filter for communication use.
FEATURES
• Ultra small size
• 6.5 mm profile
• Bandwidths from 4KHz to 30KHz available
• High selectivity
• 4 elements
R1
Rg GROUND GROUND
INPUT OUTPUT
Rg+R1=R2=input/output impedance
S.S.G.
LTMU
RF
V.M.
R2
12
34
Figure 2) LTM455U – Measuring Circuit
Frequency (KHz)
Attenuation (dB)
0
10
20
30
40
50
60
410 420 430 440 450 460 470 480 490 500
LTM455BU
LTM455EU
LTM455HU
Figure 3) LTM455U – Characteristics
PACKAGE DIMENSIONS (mm)
OPERATING CONDITIONS/ELECTRICAL CHARACTERISTICS
CENTER INSERTION PASS BAND 6 dB 40 dB STOP BAND ATT. INPUT / OUTPUT
PART NUMBER FREQUENCY LOSS RIPPLE BANDWIDTH BANDWIDTH ±100KHZ IMPEDANCE
(KHz) (dB) MAX. (dB) MAX. (KHz) MIN. (dB) MAX. (dB) MIN. (Ω)
LTM455BU 455 ±2.0 4 2 ±15 ±30 27 1500
LTM455CU 455 ±2.0 4 2 ±12.5 ±24 27 1500
LTM455DU 455 ±1.5 4 2 ±10 ±20 27 1500
LTM455EU 455 ±1.5 6 2 ±7.5 ±15 27 1500
LTM455FU 455 ±1.5 6 2 ±6 ±12.5 27 2000
LTM455GU 455 ±1.0 6 2 ±4.5 ±10 25 2000
LTM455HU 455 ±1.0 6 2 ±3 ±9 25 2000
LTM455IU 455 ±1.0 6 2 ±2 ±7.5 25 2000
LTM455HTU 455 ±1.0 6 2 ±3 ±9 35 2000
LTM455ITU 455 ±1.0 6 2 ±2 ±7.5 35 2000
Note: To avoid potential problems, connect the output to an
IF amplifier through a DC cut capacitor.
Avoid applying a direct current to output end of the ceramic
filters (between
➂
and
①②
).
