3

December 20, 2012

B3781

315.00 MHz

SAW Components

SAW filter

Data sheet

Please read

cautions and warnings and

Characteristics

Temperature range for specification:

T

= –40 ˚C to +85 ˚C

Terminating source impedance:

Terminating load impedance:

min.

typ.

@ 25 ˚C

max.

Center frequency

—

315.00

—

MHz

Minimum insertion attenuation

α

min

incl. loss in matching elements

—

1.8

2.5

dB

excl. loss in matching elements

—

1.1

2.0

dB

Pass band (relative to

α

314.725 ...

315.275MHz

—

0.9

3.0

dB

Filter bandwidth

α

0.69

0.76

0.83

MHz

Relative attenuation (relative to

α

α

rel

10.00 ...

294.50 MHz

47

51

—

dB

294.50 ...

304.50 MHz

42

46

—

dB

304.50 ...

312.80 MHz

21

28

—

dB

312.80 ...

313.20 MHz

33

40

—

dB

313.20 ...

314.30 MHz

6

9

—

dB

316.00 ...

323.00 MHz

10

14

—

dB

323.00 ...

335.00 MHz

34

40

—

dB

335.00 ...

600.00 MHz

43

48

—

dB

600.00 ... 1000.00 MHz

60

70

—

dB

1000.00 ... 2500.00 MHz

43

48

—

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:

—

410 || 2.6

—

Ω || pF

—

410 || 2.6

—

Ω || pF

Maximum ratings

Operable temperature range T

–45/+125 ˚C

Storage temperature range

–45/+125 ˚C

DC voltage

6

V

Source power

10

dBm

source impedance 50

Ω