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:
Al
2
O
3
ceramic
Lid:
Kovar, Ni
plated
Terminations:
Au
plating 0.5 - 1.0µm,
over a 2 - 6µm
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
o
C
Part Number 855975
280 MHz SAW Filter
Electrical Specifications
(1)
Parameter
(3)
Center Frequency, f
0
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
Ω
Ω
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
50Ω
15nH
50Ω
Single-ended
50Ω
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 +25
o
C)
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
50Ω
Single-ended
50Ω
10pF
1,2,4,5,6,8
18pF
50Ω
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
Ø330
ID dot
0.3
2.0
4.0
Ø1.5
A
1.75
5.5
Sawtek
logo
Ø102
Ø20.2
Ø13.0
2.0
Direction of travel
5.25
1.8
Section A-A
5.25
8.0
Ø1.5
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
T
stg
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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