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
7
6
5
3
2
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
0.64
2.08
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: Al
2
O
3
ceramic
Lid: Kovar, Ni plated
Terminations: Au plating 0.5 - 1.0
m,
over a 2 - 6
m 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
o
C
Parameter
(3)
Minimum
Typical
Maximum
Unit
Center Frequency, f
0
- 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 -
Load Impedance:
(5)
- 50 -
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:
50
Single-ended
1,2,4,5,6,8
50
10pF
12nH
18pF
3
7
15nH
50
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 +25
o
C)
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
50
Single-ended
1,2,4,5,6,8
50
10pF
12nH
18pF
3
7
15nH
50
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
1.5
1.5
8.0
4.0
2.0
5.5
1.75
2.7
Direction of travel
13.0
20.2
330
2.0
102
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
o
C
Storage Temperature Range
T
stg
-40 +85
o
C
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
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