Data Sheet
Part Number 855844
225 MHz SAW Filter
Electrical Specifications
(1)
Operating Temperature Range:
(2)
-20 to +70
o
C
Parameter
(3)
Minimum Typical Maximum Unit
Center Frequency, f
o
- 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
Subject to change or obsolescence without notice Rev B 13-Oct-2005 Page 2 of 5
