Data Sheet
Part Number 855844
225 MHz SAW Filter
Subject to change or obsolescence without notice Rev A 01-Nov-2001 Page 1 of 5
Features
• For GSM IF applications
• Usable bandwidth of 160 kHz
• Low loss
• High attenuation
• 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
1 Input
2 Input return
5 Output
6 Output return
3,4,7,8 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 855844
225 MHz SAW Filter
Subject to change or obsolescence without notice Rev A 01-Nov-2001 Page 2 of 5
Electrical Specifications (1)
Operating Temperature Range: (2) -20 to +70 oC
Parameter (3) Minimum Typical Maximum Unit
Center Frequency, fo - 225 - MHz
Insertion Loss at 225 MHz
Excluding losses due to matching
Including losses in matching test circuit shown below
-
-
2.3
3.5
3.8
5.0
dB
dB
Amplitude Variation
224.9200 - 225.0800 MHz
224.9325 - 225.0675 MHz
-
-
0.5
0.3
3.2
2.2
dB p-p
dB p-p
Rejection (4)
223 - 224.4 MHz
224.4 - 224.6 MHz
224.6 - 224.8 MHz
225.2 - 225.4 MHz
225.4 - 225.6 MHz
225.6 - 227.0 MHz
35
26
5
5
26
35
45
32
11
13
30
39
-
-
-
-
-
-
MHz
MHz
MHz
MHz
MHz
MHz
Out of Band Rejection
10 - 215 MHz
235 - 750 MHz
42
42
45
45
-
-
dB
dB
Group Delay Ripple
224.9200 - 225.0800 MHz
224.9325 - 225.0675 MHz
224.9500 - 225.0500 MHz
-
-
-
0.9
0.6
0.2
1.8
1.6
1.3
µsec
µsec
µsec
Optimal Source Impedance: (5) - 704Ω||332nH - Ω
Optimal Load Impedance: (5) - 739Ω||359nH - 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. Relative to insertion loss at 225 MHz
5. This is the complex conjugate of the unmatched filter’s impedance resulting in maximum power transfer
Test Circuit:
50Ω
Balanced
3,4,7,8
50
Ω
7pF
82nH
7pF
7pF
7pF
2
1
5
6
82nH 50
Ω
Data Sheet
Part Number 855844
225 MHz SAW Filter
Subject to change or obsolescence without notice Rev A 01-Nov-2001 Page 3 of 5
Typical Performance (at +25oC)
Data Sheet
Part Number 855844
225 MHz SAW Filter
Subject to change or obsolescence without notice Rev A 01-Nov-2001 Page 4 of 5
Matching Schematics
Actual matching values may vary due to PCB layout and parasitics
50Ω
Balanced
3,4,7,8
50
Ω
7pF
82nH
7pF
7pF
7pF
2
1
5
6
82nH 50
Ω
Marking PCB Footprint
Date code
C
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
12.8
2.7
Ø13.0
Ø20.2
Ø330 logo
Sawtek
ID dot
2.0
Ø102
Direction of travel
Dimensions shown are nominal in millimeters
Packaging quantity: 4000 units/reel
Data Sheet
Part Number 855844
225 MHz SAW Filter
Subject to change or obsolescence without notice Rev A 01-Nov-2001 Page 5 of 5
Maximum Ratings
Parameter Symbol Minimum Maximum Unit
Operating Temperature Range T -20 +70 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
