FEATURES

APPLICATIONS

Specify

Ceramic Filter

LTW33 Series

450 kHz & 455kHz

q u a r t z

b a s e d

f r e q u e n c y

c o n t r o l

c o m p o n e n t s

Order Hotline +44 1293 524245

www.aelcrystals.co.uk

sales@aelcrystals.co.uk

45

SP EC IF IC A TI O N

High Selectivity

Low Cost

Wide Range of bandwidths Available

Industry Standard Outline

Communications Equipment

F R E Q U E N C Y

C H A R A C T E R I S T I C S

Frequency Characteristics

Test Circuit

4

3

2

1

5

2.0

4.3

Pin Connections

1 = Input

2 = Ground

3 = Ground

4 = Ground

5 = Output

33-455D

11.3

7

2.9 2.9 2.6

To take the best advantage of the safety feature of ceramic filters, connect output to anIF amplifier through a DC cut capacitor.

Avoid directly applying DC to output end of ceramic filters (Between 5 & 2,3,4)

Part

Numb er

Centre

Freq (M Hz)

Insertion

Loss

(dB Max)

Pass Band

Ripple

(dB Max)

6 dB

Bandwidth

(kHz Min)

40 dB

Bandwidth

(kHz Min)

Stopband

Att. +/ -100kHz

(dB M in )

Input/Output

Impedence ( )

LTW33-455B

455 +/ -2.0

4

2

+/-15.0

+/ -30.0

35

1500

LTW33-455C

455 +/ -2.0

4

2

+/-12.5

+/ -24.0

35

1500

LTW33-455D

455 +/ -1.5

4

2

+/-10.0

+/ -20.0

35

1500

LTW33-455E

455 +/ -1.5

6

2

+/- 7.5

+/-15.0

35

1500

LTW33-455F

455 +/ -1.5

6

2

+/- 6.0

+/-12.5

35

2000

LTW33-455G

455 +/ -1.5

6

2

+/- 4.5

+/-10.0

35

2000

LTW33-455H

455 +/ -1.0

6

2

+/- 3.0

+/- 9.0

35

2000

LTW33-455I

455 +/ -1.0

6

2

+/- 2.0

+/- 7.5

35

2000

LTW33-455HT

455 +/ -1.0

6

2

+/- 3.0

+/- 9.0

60

2000

RF

V.M

C

R2

S.S.G

R1

LTW

1

5

2

Rg

Rg+R1+R2=input/Output Impedence

C=10pF (Including strays and input/output

capacitance of RF Voltmeter

4

3

400

410

420

430

440

450

460

470

480

490

500

0

1 0

2 0

3 0

4 0

5 0

6 0

Freq (kHz)

LTW33-455B

LTW33-455D

LTW33-455H

www.aelcrystals.co.uk