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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

4 ELEMENT CERAMIC FILTER

2.4 1.8 0.8

7

7

4.3

0.8

4

3

2

1

Connection

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

• RoHS Compliant (Note 7 exemption)

• 4 elements

R1

Rg

GROUND

GROUND

INPUT

OUTPUT

Rg+R1=R2=input/output impedance

S.S.G.

LTMU

RF

V.M.

R2

1

2

3

4

Figure 2) LTM455U – Measuring Circuit

Frequency (KHz)

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

LTM45HTU

455 ±1.0

6

2

±3

±9

35

2000

LTM45ITU

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 xy).