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©2009 by RF Monolithics, Inc. RF3210D - 8/27/09
• Ideal Front-End Filter for Domestic Wireless Receivers
• Low-Loss, Coupled-Resonator Quartz Design
• Simple External Impedance Matching
• Complies with Directive 2002/95/EC (RoHS)
The RF3210D is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to provide
front-end selectivity in 303.825 MHz receivers. Receiver designs using this filter include superheterodyne with
10.7 MHz or lower IF frequencies, direct conversion receivers and superregenerative receivers.
This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically greater
than 40 dB, of the LO and image spurious responses of superhet receivers with 10.7 MHz IF. RFM’s advanced
SA W design and fabrication technology is utilized to achieve high performance and very low loss with simple
external impedance matching.
303.825 MHz
SAW Filter
RF3210D
SM3838-8 Case
3.8 x 3.8
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture which is connected to a 50 Ω test system with VSWR < 1.2:1. The
test fixture L and C are adjusted for minimum insertion loss at the filter center frequency, fc. Note that insertion loss and bandwidth and passband shape are dependent on
the impedance matching component values and quality.
2. The frequency fc is defined as the midpoint between the 3 dB frequencies.
3. Where noted specifications apply over the entire specified operating temperature range of -40 °C to +90 °C.
4. The turnover temperature, TO, is the temperature of maximum (or turnover) frequency, fo. The nominal frequency at any case temperature, Tc, may be calculated from:
f=f
o[1 - FTC (To-T
c)2].
5. Frequency aging is the change in fc with time and is specified at +65 °C or less. Aging may exceed the specification for prolonged temperatures above +65 °C. Typically,
aging is greatest the first year after manufacture, decreasing significantly in subsequent years.
6. The design, manufacturing process, and specifications of this device are subject to change without notice.
7. One or more of the following U.S. Patents apply: 4,54,488, 4,616,197, and others pending.
8. All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.
9. Tape and Reel Standard Per ANSI/EIA 481.
10. This product complies with directive 2002/95/EC of the European Parlament and of the Council of 27 January 2003 on the restriction of the use of certain hazardous
substances in electrical and electronic equipment.
Electrical Character istics
Characteristic Sym Notes Minimum Typical Maximum Units
Center Frequency @ 25°C fC1, 2, 3 303.825 MHz
Minimum Insertion Loss, 303.620 to 303.980 MHz ILMIN 1, 3 1. 6 2.5 dB
Passband Loss Relative to ILMIN:
303.595 t o 304.025 MH z 11.0 3.0 dB
303.535 t o 304.085 MH z 1.5 6.0
3 dB Bandwidth BW31, 3 500 650 800 kHz
Attenuation Relative to ILMIN:
10 to 260 MHz
1
45 55
dB
260 to 297 MHz 35 45
297 to 302. 5 MHz 11.5 15
304.8 to 320 MHz 14 20
320 to 400 MHz 37 40
400 to 1000 MHz 45 55
Frequency Temperature Coefficient FTC 0.032 ppm/°C2
Frequency Aging, Absolute Value During the First Year | fA| ≤10 ppm/yr
Impedance @ FCInput ZIN=RINllCIN ZIN 111.7 KΩ ll 1.8 pF
Output ZOUT=ROUTllCOUT ZOUT 6.63 KΩ ll 2.2 pF
Lid Symbolization (Y=year WW=week D=day of week) 675 // YWWS
Standard Reel Quantity Reel Size 7 Inch 9500 Pieces/Reel
Reel Size 13 Inch 3000 Pieces/Reel
Pb
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©2009 by RF Monolithics, Inc. RF3210D - 8/27/09
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Absolute Maximum Ratings
Rating Value Units
Input Power Level 10 dBm
DC V oltage 12 VDC
S torage Temperature -40 to +125 °C
Operable Temperature Range -40 to +125 °C
Soldering Temperature, 10 seconds / 5 cycles maximum 260 °C
Pin Connection
1 Input
2 Input Ground
3 Ground
4 Case Ground
5 Output
6 Output Ground
7 Ground
8 Case Ground
Matching Circuit to 50 Ω
Electri cal Conne ction s
A
1
2
3
B
7
6
5
4
C
H7
6
5
4
E
F
G
1
2
3
88
D
Pin Connection
1 Input Ground
2 Input
3 Ground
4 Case Ground
5 Output Ground
6 Output
7 Ground
8 Case Ground
Optional Electrical Connections
Optional Matching Circuit to 50 Ω
Case Dimensions
Dimension mm Inches
Min Nom Max Min Nom Max
A3.6 3.8 4.0 0.14 0.15 0.16
B3.6 3.8 4.0 0.14 0.15 0.16
C1.00 1.20 1.40 0.04 0.05 0.055
D0.95 1.10 1.25 0.033 0.043 0.05
E0.90 1.0 1.10 0.035 0.04 0.043
F0.50 0.6 0.70 0.020 0.024 0.028
G2.39 2.54 2.69 0.090 0.100 0.110
H1.40 1.75 2.05 0.055 0.069 0.080
