3

March 22, 2007

B3737

447.725 MHz

SAW Components

SAW filter

Data sheet

Please read

cautions and warnings and

important notes at the end of this document.

Characteristics

Operating temperature range:

T

= –45 ˚C to +95 ˚C

Terminating source impedance:

Terminating load impedance:

min.

typ.

@ 25 ˚C

max.

Center frequency

—

447.725

—

MHz

Minimum insertion attenuation

α

min

—

2.2

3.0

dB

excl. loss in matching elements

—

1.6

2.6

dB

Pass band (relative to

α

447.60 ...

447.85 MHz

—

0.8

2.0

dB

447.58 ...

447.87 MHz

—

1.0

3.0

dB

447.56 ...

447.91 MHz

—

1.2

6.0

dB

Filter bandwidth

α

0.65

0.70

0.75

MHz

Relative attenuation (relative to

α

α

rel

10.00 ...

427.80 MHz

50

55

—

dB

427.80 ...

437.30 MHz

45

50

—

dB

437.30 ...

444.72 MHz

30

38

—

dB

444.72 ...

446.72 MHz

15

20

—

dB

448.72 ...

458.22 MHz

12

15

—

dB

458.22 ...

467.72 MHz

40

50

—

dB

467.72 ...

810.00 MHz

42

54

—

dB

810.00 ... 1500.00 MHz

50

65

—

dB

1500.00 ... 2000.00 MHz

45

60

—

dB

1)

Impedance for passband matching bases on an ideal, perfect matching of the SAW filter to source- and to load

impedance (here 50 Ohm). After removal of the SAW filter the input impedance of the input and output match-

ing network is calculated. The conjugate complex value of these characteristic impedances are the input and

output impedances for flat passband. For more details we refer to EPCOS application note #4.

Input:

=

||

—

340 || 2.2

—

Ω || pF

Output:

—

340 || 2.2

—

Ω || pF