LTM450U
SERIES
4 ELEMENT CERAMIC FILTER
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
• RoHS Compliant (Note 7 exemption)
• 4 elements
OPERATING CONDITIONS/ELECTRICAL CHARACTERISTICS
PART NUMBER
LTM450BU
LTM450CU
LTM450DU
LTM450EU
LTM450FU
LTM450GU
LTM450HU
LTM450IU
LTM450HTU
LTM450ITU
CENTER
FREQUENCY
(KHz)
450
450
450
450
450
450
450
450
450
450
±2.0
±2.0
±1.5
±1.5
±1.5
±1.0
±1.0
±1.0
±1.0
±1.0
INSERTION
LOSS
(dB) MAX.
4
4
4
6
6
6
6
6
6
6
PASS BAND
RIPPLE
(dB) MAX.
2
2
2
2
2
2
2
2
2
2
6 dB
BANDWIDTH
(KHz) MIN.
±15
±12.5
±10
±7.5
±6
±4.5
±3
±2
±3
±2
40 dB
BANDWIDTH
(dB) MAX.
±30
±24
±20
±15
±12.5
±10
±9
±7.5
±9
±7.5
STOP BAND ATT.
±100KHZ
(dB) MIN.
27
27
27
27
27
25
25
25
35
35
INPUT / OUTPUT
IMPEDANCE
(Ω)
1500
1500
1500
1500
2000
2000
2000
2000
2000
2000
PACKAGE DIMENSIONS (mm)
7
7
INPUT
OUTPUT
R1
6.5
1
2
LTMU
3
4
GROUND
Rg
GROUND
R2
S.S.G.
4
RF
V.M.
0.8
Rg+R1=R2=input/output impedance
2.4 1.8 0.8
4.3
Figure 2) LTM450U – Measuring Circuit
1
2
Connection
1 Input
0
10
LTM455BU
LTM455EU
4.3
2 Output
3 Ground
4 Ground
Attenuation (dB)
3
4
20
30
40
50
LTM455HU
2.4 1.8 0.8
Figure 1) LTM450U – Front, Side and Bottom views
60
410 420 430 440 450 460 470 480 490 500
Frequency (KHz)
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
xy).
Figure 3) LTM4550U – Characteristics
ECS, INC. INTERNATIONAL
1105 S. RIDGEVIEW, OLATHE, KS 66062 • 913-782-7787 • 800-237-1041 • FAX 913-782-6991 • WWW.ECSXTAL.COM
CERAMIC FILTERS
78
CERAMIC FILTERS
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