RF3417
• Ideal Front-End Filter for USA Automotive Wireless Receivers
• Low-Loss, Coupled-Resonator Quartz Design
• Simple External Impedance Matching
315.0 MHz
SAW Filter
• Rugged TO39 Hermetic Package
• Complies with Directive 2002/95/EC (RoHS)
Pb
The RF3417 is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to provide
front-end selectivity in 315.0 MHz receivers. Receiver designs using this filter include superhet with 10.7 MHz
or 500 kHz IF, direct conversion and superregen. Typical applications of these receivers are wireless remote-
control and security devices (especially for automotive keyless entry) operating in the USA under FCC Part
15, in Canada under DOC RSS-210, and in Italy.
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
SAW design and fabrication technology is utilized to achieve high performance and very low loss with simple
external impedance matching (not included). Quartz construction provides excellent frequency stability over
a wide temperature range.
TO39-3 Case
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
f
Center Frequency at 25°C
Absolute Frequency
314.92
315.00
315.080
±80
MHz
dB
c
1, 2
Tolerance from 315.0 MHz
∆fc
Insertion Loss
IL
1
1.7
3.0
dB
BW
3 dB Bandwidth
Rejection
1, 2
500
40
700
800
kHz
dB
3
at f - 21.4 MHz (Image)
50
40
80
c
at f - 10.7 MHz (LO)
1
15
c
Ultimate
Temperature
Operating Case Temp.
T
-40
22
+85
52
°C
°C
C
Turnover Temperature
Turnover Frequency
Freq. Temp. Coefficient
T
37
O
3, 4
f
f
MHz
ppm/°C
O
c
2
FTC
0.032
Frequency Aging
Absolute Value during the First Year
Series Inductance
|fA|
L
5
1
≤10
ppm/yr
86 nH (Pin 1), 82 nH (Pin 2)
9
External Impedance
Shunt Capacitance
C
pF
Lid Symbolization (in addition to Lot and/or Date Codes)
RFM RF3417
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, f . Note that insertion loss, bandwidth,
c
and passband shape are dependent on the impedance matching component values and quality.
2. The frequency f is defined as the midpoint between the 3dB frequencies.
c
3. Unless noted otherwise, specifications apply over the entire specified operating temperature range.
4. The turnover temperature, T , is the temperature of maximum (or turnover) frequency, f . The nominal frequency at any case temperature, T , may
O
o
c
2
be calculated from: f = f [1 - FTC (T - T ) ].
o
o
c
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.
www.RFM.com
E-mail: info@rfm.com
Page 1 of 2
©2008 by RF Monolithics, Inc.
RF3417 - 3/21/08
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