3

May 18, 2005

SAW Components

X 6940 D

57,00 MHz

Bandpass Filter

Data Sheet

Characteristics

Reference temperature:

Terminating source impedance:

Terminating load impedance:

min.

typ.

max.

Insertion attenuation

α

Reference level for the

57,02 (57,00) MHz

13,1

14,6

16,1

dB

following data

Amplitude ripple (p-p)

∆α

54,52 ... 59,02 (54,50 ... 59,00) MHz

—

0,5

—

dB

Relative attenuation

α

rel

52,77 (52,75) MHz

38,0

44,0

—

dB

54,12 (54,10) MHz

1,6

2,8

4,0

dB

59,52 (59,50) MHz

1,9

3,1

4,3

dB

60,27 (60,25) MHz

30,0

38,0

—

dB

62,40 (62,38) MHz

41,0

47,0

—

dB

64,77 (64,75) MHz

43,0

49,0

—

dB

Lower sidelobe

45,02 ... 50,02 (45,00 ... 50,00) MHz

38,0

43,0

—

dB

50,02 ... 52,77 (50,00 ... 52,75) MHz

34,0

39,0

—

dB

Upper sidelobe

62,40 ... 70,02 (62,38 ... 70,00) MHz

36,0

42,0

—

dB

Reflected wave signal suppression

1,5

µs ... 6,0 µs after main pulse

42,0

52,0

—

dB

(test pulse 250 ns, carrier frequency 57,02 MHz)

Group delay ripple (p-p)

∆τ

54,52 ... 59,02 (54,50 ... 59,00) MHz

—

40

—

ns

Impedance at 57,02 MHz

Input:

=

||

—

1,3||23,5

—

k

Ω || pF

Output:

—

4,0|| 6,3

—k

Ω || pF

Temperature coefficient of frequency

—

–18

—

ppm/K

Matching network: