Preliminary
SF2218D
•
•
•
•
Low Insertion Loss
3.8 X 3.8 mm Surface-mount Case
Single-ended Input and Differential Output
Complies with Directive 2002/95/EC (RoHS)
Pb
425 MHz
SAW Filter
Value
+10
3
-40 to +85
260°C for 30 s
Absolute Maximum Ratings
Rating
Maximum Incident Power in Passband
Maximum DC Voltage on any Non-ground Terminal
Storage Temperature Range in Tape and Reel
Suitable for Lead-free Soldering - Maximum Soldering Temperature
Units
dBm
VDC
°C
SM3838-8
Electrical Characteristics
Characteristic
Nominal Center Frequency
Insertion Loss, 425 MHz
3 dB Bandwidth
Passband Amplitude Ripple, 420 to 430 MHz
Attenuation Referenced to 0 dB:
275 to 300 MHz
299 to 335 MHz
334 to 360 MHz
359 to 385 MHz
386 to 400 MHz
400 to 410 MHz
455 to 484 MHz
485 to 494 MHz
495 to 575 MHz
Single-ended Source Impedance
Balanced Load Impedance
Operating Temperature Range
Case Style
Lid Symbolization (Y=year, WW=week, S=shift)
Sym
f
C
IL
BW
3dB
Notes
1
1
Min
Typ
425
Max
5.0
Units
MHz
dB
MHz
dB
P-P
10
1
2
2
2
2
2
2
2
2
2
45
40
45
35
20
40
20
35
40
19
1.0
2.1
dB
50
100
-20
+70
SM3838-8 3.8 x 3.8 mm Nominal Footprint
RFM 956 YWWS
ohm
ohm
°C
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1.
2.
3.
4.
5.
6.
7.
Unless noted otherwise, all specifications apply over the operating temperature range with filter soldered to the specified demonstration board with impedance
matching to 50
Ω
and measured with 50
Ω
network analyzer.
Rejection is measured as attenuation referenced to 0 dB. Rejection in final user application is dependent on PCB layout and external impedance matching
design. See Application Note No. 42 for details.
The design, manufacturing process, and specifications of this filter are subject to change.
Tape and Reel Standard ANSI / EIA 481.
Either Port 1 or Port 2 may be used for either input or output in the design. However, impedances and impedance matching may vary between Port 1 and Port
2, so that the filter must always be installed in one direction per the circuit design.
US and international patents may apply.
RFM, stylized RFM logo, and RF Monolithics, Inc. are registered trademarks of RF Monolithics, Inc.
www.RFM.com E-mail: info@rfm.com
©2010 by RF Monolithics, Inc.
Page 1 of 4
SF2218D - 7/27/10
RFM [ RF MONOLITHICS, INC ]
