3

May 27, 2009

B3784

314.45 MHz

SAW Components

SAW RF filter

Data sheet

Please read

cautions and warnings and

important notes at the end of this document.

Characteristics

Temperature range for specification:

T

= –40 ˚C to+105 ˚C

Terminating source impedance:

Terminating load impedance:

min.

typ.

@ 25 ˚C

max.

Center frequency

—

314.45

—

MHz

Minimum insertion attenuation

α

min

—

1.9

2.7

dB

excl. loss in matching elements

—

1.0

1.8

dB

Pass band (relative to

α

313.92 ...

314.98 MHz

—

1.1

2.5

dB

313.90 ...

315.00 MHz

—

1.3

3.0

dB

Relative attenuation (relative to

α

α

rel

10.00 ...

250.00 MHz

50

55

—

dB

250.00 ...

294.45 MHz

41

46

—

dB

294.45 ...

304.45 MHz

35

40

—

dB

304.45 ...

312.85 MHz

15

20

—

dB

315.45 ...

317.45 MHz

7

10

—

dB

317.45 ...

322.45 MHz

20

25

—

dB

322.45 ...

329.45 MHz

30

35

—

dB

329.45 ...

339.45 MHz

42

47

—

dB

339.45 ...

600.00 MHz

45

50

—

dB

600.00 ... 1000.00 MHz

60

65

—

dB

1000.00 ... 2500.00 MHz

35

40

—

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:

—

790 || 2.8

—

Ω || pF

—

790 || 2.8

—

Ω || pF