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Data Sheet
Features
* * * * * * * For WLAN applications Usable bandwidth of 17 MHz Low loss High attenuation at tones Single-ended or balanced operation Ceramic Surface Mount Package (SMP) Small size
Part Number 855975 280 MHz SAW Filter
*
Package
Surface Mount 5.00 x 5.00 x 1.32 mm
Pin Configuration
Bottom View
1 2 3
1.32 NOM. 1.52 MAX. 5.00 1.27
0.66
8
4
7
6
5
5.00 1.27
Pin No. 2 3 6 7 1,4,5,8
Description Input return Input Output return Output Case ground
2.08
0.64
Dimensions shown are nominal in millimeters All tolerances are 0.15mm except overall length and width 0.15/0.10mm Body: Al2O3 ceramic Lid: Kovar, Ni plated Terminations: Au plating 0.5 - 1.0m, over a 2 - 6m Ni plating
Subject to change or obsolescence without notice
Rev A
07-Dec-2001
Page 1 of 5
Data Sheet
Operating Temperature Range: (2) -10 to +50 oC
Part Number 855975 280 MHz SAW Filter
Electrical Specifications (1)
Parameter (3)
Center Frequency, f0 Insertion Loss at 280 MHz Lower 3 dB Point (4) Upper 3 dB Point Passband Ripple 271.5 - 288.5 MHz Group Delay Variation 271.5 - 288.5 MHz Stopband Rejection (4) 10 - 250 MHz 310 - 340 MHz 340 - 500 MHz Source Impedance: (5) Load Impedance: (5) Notes:
1. 2. 3. 4. 5.
Minimum
288.5 40 38 40 -
Typical
280 8.95 269.1 291.1 0.6 40 43 40 42 50 50
Maximum
10 271.5 1 100 -
Unit
MHz dB MHz MHz dB p-p ns dB dB dB
All specifications are based on the test circuit shown below In production, devices will be tested at room temperature to a guardbanded specification to ensure electrical compliance over temperature Electrical margin has been built into the design to account for the variations due to temperature drift and manufacturing tolerances Relative to insertion loss at 280 MHz This is the optimum impedance in order to achieve the performance shown
Test Circuit:
12nH 3 7 18pF 1,2,4,5,6,8 50 15nH
50 Single-ended
50
10pF
Subject to change or obsolescence without notice
Rev A
07-Dec-2001
Page 2 of 5
Data Sheet
Part Number 855975 280 MHz SAW Filter
Typical Performance (at +25oC)
Subject to change or obsolescence without notice
Rev A
07-Dec-2001
Page 3 of 5
Data Sheet
Actual matching values may vary due to PCB layout and parasitics
12nH 3 7 15nH
Part Number 855975 280 MHz SAW Filter
Matching Schematics
50 Single-ended
50
10pF 1,2,4,5,6,8
18pF
50
Marking
2.28
Sawtek logo Marking code
PCB Footprint
5.20 1.47
J JJJYM
.84 .71
ID dot Date code
.43
.84
1.47
The date code consists of: JJJ = Julian day, Y = last digit of year, M = manufacturing site code
This footprint represents a recommendation only Dimensions shown are nominal in millimeters
Tape and Reel
2.7 12.8 O330 ID dot
0.3 2.0 4.0 O1.5 A 1.75 5.5
Sawtek logo O102 O20.2 O13.0 2.0 Direction of travel
5.25 1.8 Section A-A 5.25 8.0 O1.5 A
12.0
Dimensions shown are nominal in millimeters Packaging quantity: 4000 units/reel
Subject to change or obsolescence without notice
Rev A
07-Dec-2001
Page 4 of 5
Data Sheet
Maximum Ratings
Parameter
Operating Temperature Range Storage Temperature Range
Part Number 855975 280 MHz SAW Filter
Symbol
T Tstg
Minimum
-10 -40
Maximum
+50 +85
Unit
o o
C C
Warnings
* * Electrostatic Sensitive Device (ESD) Avoid ultrasonic exposure
Links to Additional Technical Information
PCB Layout Tips S-Parameters Qualification Flowchart Soldering Profile Other Technical Information
Contact Information
PO Box 609501 Orlando, FL 32860-9501 USA
Subject to change or obsolescence without notice
Phone: +1 (407) 886-8860 Fax: +1 (407) 886-7061 Email: custservice@sawtek.com Web: www.sawtek.com
Rev A
Or contact one of our worldwide network of sales offices, representatives or distributors
07-Dec-2001
Page 5 of 5

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