Data Sheet

Part Number 855915

249.6 MHz SAW Filter

Minimum

Typical

Maximum

Unit

Center Frequency

-

249.6

-

MHz

Minimum Insertion Loss at 249.6 MHz

-

16.11

20

dB

1 dB Upper Frequency

1 dB Bandwidth

-

251.52

3.84

246.98

251.89

4.89

247.68

-

5

MHz

MHz

MHz

40 dB Upper Frequency

40 dB Bandwidth

244.1

-

-

244.27

254.41

10.14

-

255.1

11

MHz

MHz

MHz

Passband Ripple

247.68 - 251.52 MHz

-

0.22

1

dB p-p

Group Delay Variation

247.68 - 251.52 MHz

-

27.15

50

nsec

Input VSWR

247.68 - 251.52 MHz

-

1.25:1

2.10:1

-

Output VSWR

247.68 - 251.52 MHz

-

1.34:1

2.10:1

-

10 - 234.6 MHz

264.6 - 450 MHz

45

45

63.5

55.63

-

-

dB

dB

-

50

-

Ω

-

50

-

Ω

Notes:

1.

All specifications are based on the test circuit shown below

2.

In production, devices will be tested at room temperature to a guardbanded specification to ensure electrical compliance over

temperature

3.

Electrical margin has been built into the design to account for the variations due to manufacturing tolerances

4.

The attenuation measurements are referenced to average insertion loss over passband

5.

This is the optimum impedance in order to achieve the performance shown

Test Circuit:

Actual matching values may vary due to PCB layout and parasitics

50

Ω

Single-ended

1,2,3,5,6

7,8,9,11,12

50

Ω

27nH

10

4

120nH

50

Ω

Ω

10

82nH

110nH

82nH

6.8Ω

Subject to change or obsolescence without notice

Rev B

30-Oct-2002

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