Data Sheet
Part Number 855975
280 MHz SAW Filter
Subject to change or obsolescence without notice Rev A 07-Dec-2001 Page 1 of 5
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
•
Package Pin Configuration
Surface Mount 5.00 x 5.00 x 1.32 mm Bottom View
4
8
765
32
1
Pin No. Description
2 Input return
3 Input
6 Output return
7 Output
1,4,5,8 Case ground
1.32 NOM.
1.52 MAX.
0.66
1.27
1.27
0.642.08
5.00
5.00
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 - 1.0µm,
over a 2 - 6µm Ni plating
Data Sheet
Part Number 855975
280 MHz SAW Filter
Subject to change or obsolescence without notice Rev A 07-Dec-2001 Page 2 of 5
Electrical Specifications (1)
Operating Temperature Range: (2) -10 to +50 oC
Parameter (3) Minimum Typical Maximum Unit
Center Frequency, f0 - 280 - MHz
Insertion Loss at 280 MHz - 8.95 10 dB
Lower 3 dB Point (4)
Upper 3 dB Point
-
288.5
269.1
291.1
271.5
-
MHz
MHz
Passband Ripple
271.5 - 288.5 MHz
-
0.6
1
dB p-p
Group Delay Variation
271.5 - 288.5 MHz
-
40
100
ns
Stopband Rejection (4)
10 - 250 MHz
310 - 340 MHz
340 - 500 MHz
40
38
40
43
40
42
-
-
-
dB
dB
dB
Source Impedance: (5) - 50 -
Ω
Load Impedance: (5) - 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 temperature drift and manufacturing tolerances
4. Relative to insertion loss at 280 MHz
5. This is the optimum impedance in order to achieve the performance shown
Test Circuit:
50Ω
Single-ended
1,2,4,5,6,8
50
Ω
10pF
12nH
18pF
37
15nH
50
Ω
Data Sheet
Part Number 855975
280 MHz SAW Filter
Subject to change or obsolescence without notice Rev A 07-Dec-2001 Page 3 of 5
Typical Performance (at +25oC)
Data Sheet
Part Number 855975
280 MHz SAW Filter
Subject to change or obsolescence without notice Rev A 07-Dec-2001 Page 4 of 5
Matching Schematics
Actual matching values may vary due to PCB layout and parasitics
50Ω
Single-ended
1,2,4,5,6,8
50
Ω
10pF
12nH
18pF
37
15nH
50
Ω
Marking PCB Footprint
Date code
J
JJJYM
ID dot
logo
Sawtek
code
Marking
1.47
5.20
2.28
.84 1.47
.84
.43
.71
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
12.0
Section A-A
A
A
0.3
1.8
5.25
5.25
Ø1.5
Ø1.5
8.0
4.0
2.0
5.5
1.75
2.7
Direction of travel
Ø13.0
Ø20.2
Ø330
2.0
Ø102
12.8 ID dot
Sawtek
logo
Dimensions shown are nominal in millimeters
Packaging quantity: 4000 units/reel
Data Sheet
Part Number 855975
280 MHz SAW Filter
Subject to change or obsolescence without notice Rev A 07-Dec-2001 Page 5 of 5
Maximum Ratings
Parameter Symbol Minimum Maximum Unit
Operating Temperature Range T -10 +50 oC
Storage Temperature Range Tstg -40 +85
oC
Warnings
• Electrostatic Sensitive Device (ESD)
• Avoid ultrasonic exposure
Links to Additional Technical Information
PCB Layout Tips Qualification Flowchart Soldering Profile
S-Parameters Other Technical Information
Contact Information
PO Box 609501
Orlando, FL 32860-9501
USA
Phone: +1 (407) 886-8860
Fax: +1 (407) 886-7061
Email: custservice@sawtek.com
Web: www.sawtek.com
Or contact one of our worldwide
network of sales offices,
representatives or distributors
