3

January 25, 2006

B3773

868.95 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 +120 ˚C

Terminating source impedance:

Terminating load impedance:

min.

typ.

@ 25 ˚C

max.

Center frequency

—

868.95

—

MHz

Minimum insertion attenuation

α

min

—

3.0

3.7

dB

excl. loss in matching elements

—

2.5

3.2

dB

Pass band (relative to

α

868.80 ...

869.10 MHz

—

0.5

2.0

dB

868.70 ...

869.20 MHz

—

1.1

3.0

dB

Filter bandwidth

α

1.25

1.35

1.45

MHz

Relative attenuation (relative to

α

α

rel

10.00 ...

850.00 MHz

55

59

—

dB

850.00 ...

858.00 MHz

50

55

—

dB

858.00 ...

866.15 MHz

30

35

—

dB

871.65 ...

880.00 MHz

23

27

—

dB

880.00 ...

890.00 MHz

40

47

—

dB

890.00 ... 1000.00 MHz

55

59

—

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:

=

||

—

270 || 1.0

—

Ω || pF

Output:

—

270 || 1.0

—

Ω || pF