3

February 28, 2007

B3731

315.00 MHz

SAW Components

SAW filter

Data sheet

Please read

cautions and warnings and

important notes at the end of this document.

Characteristics

Temperature range for specification:

T

= –45 ˚C to +95 ˚C

Terminating source impedance:

Terminating load impedance:

min.

typ.

@ 25 ˚C

max.

Center frequency

—

315.00

—

MHz

Minimum insertion attenuation

α

min

—

2.4

3.2

dB

excl. loss in matching elements

—

1.4

2.2

dB

Pass band (relative to

α

314.85 ...

315.15 MHz

—

0.6

2.0

dB

314.82 ...

315.18 MHz

—

0.8

3.0

dB

314.78 ...

315.22 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 ...

313.20 MHz

32

36

—

dB

313.20 ...

314.00 MHz

25

29

—

dB

316.00 ...

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