4

December 17, 2009

B3739

314.90 MHz

Please read

cautions and warnings and

important notes at the end of this document.

SAW Components

SAW filter

Data sheet

Characteristics

Operating temperature range:

T

= –45 ˚C to +125 ˚C

Terminating source impedance:

Terminating load impedance:

min.

typ.

@ 25 ˚C

max.

Center frequency

—

314.90

—

MHz

Minimum insertion attenuation

α

min

—

2.3

3.2

dB

excl. loss in matching elements

—

1.3

2.2

dB

Pass band (relative to

α

314.75 ...

314.98 MHz

—

0.6

2.0

dB

314.72 ...

315.01 MHz

—

0.8

3.0

dB

314.68 ...

315.05 MHz

—

1.2

6.0

dB

Filter bandwidth

α

0.57

0.63

0.69

MHz

Relative attenuation (relative to

α

α

rel

10.00 ...

295.00 MHz

48

53

—

dB

295.00 ...

307.00 MHz

43

48

—

dB

307.00 ...

313.00 MHz

32

36

—

dB

313.00 ...

313.90 MHz

22

29

—

dB

315.90 ...

325.00 MHz

10

14

—

dB

325.00 ...

336.00 MHz

38

43

—

dB

336.00 ...

370.00 MHz

42

46

—

dB

370.00 ...

600.00 MHz

52

57

—

dB

600.00 ... 1500.00 MHz

60

65

—

dB

1500.00 ... 2500.00 MHz

55

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:

—

610 || 2.2

—

Ω || pF

—

610 || 2.2

—

Ω || pF