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©2008 by RF Monolithics, Inc. RF1172 - 3/20/08
TO39-3 Case
• Ideal Front-End Filter for European Wireless Receivers
• Low-Loss, Coupled-Resonator Quartz Design
• Simple External Impedance Matching
• Rugged TO39 Hermetic Package
• Complies with Directive 2002/95/EC (RoHS)
The RF1 172 is a lo w-loss, comp act and eco nomical surfa ce-acoustic -wave (SAW) fi lter designe d
to provi de front-end s electivity in 433.92 MHz rece ivers. Re ceiver d esigns usi ng this filt er include
superhet with 10.7 MHz or 500 kHz IF, direct c onversion and superre gen. Typical app lications of
these r eceivers are wirel ess remote-contro l and security devi ces operating in Euro pe under ETSI
I-ETS 300 220.
This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically
greater tha n 40 dB, of the L O and image spurious respon ses of su perhet receiv ers with 10.7 M Hz
IF. RFM’s advanced SAW design and fabrication technology is utilized to achieve high
performan ce and v ery low los s with si mp le e xte rnal im ped anc e m atc hin g (no t inc lu ded ). Qua rtz
construction provides excellent frequency stability over a wide temperature range.
433.92 MHz
SAW Filter
RF1172
CAUTION: Electrostatic Sensitive D evice. Obs erve precau tions for handling.
Notes:
1. Unless noted otherwise, all measurements are made with t he 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, 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 3dB frequencies.
3. Where noted, specifications apply over the entire specified operating temperature range.
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 = fo[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 t his product must be approved by the appropriate government agency prior to manufacture or sale.
Electrical Charac teristics
Characteristic Sym Notes Minimum Typical Maximum Units
Center Frequency at 25°C Absolute Frequency fc1, 2 433.92 MHz
Tolerance from 433.92 MHz ΔfC±80 kHz
Insertion Loss IL 1 3.5 5.0 dB
3 dB Bandwidth BW31, 2 500 600 800 kHz
Rejection at fc - 21.4 MHz (Image)
140 50 dBat fc - 10.7 MHz (LO) 15 30
Ultimate 80
Temperature Operating Case Temp. TC
3, 4
-40 +85 °C
Turnover Temperatur e TO15 25 40 °C
Turnover Frequency fOfcMHz
Freq. Temp. Coefficient FTC 0.032 ppm/°C2
Frequency Aging Abs olute Value during the First Year |fA| 5 ≤10 ppm/yr
External Impedance Series Inductance L 147 nH
Shun t C a paci ta n ce C11 pF
Lid Symbolization (in addition to Lot and/or Date Codes) RFM RF1172
Pb
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©2008 by RF Monolithics, Inc. RF1172 - 3/20/08
Absolute Maximum Ratings
Typical Filter Response
Typical filter responses are shown below. The actual response is
dependent on external impedance matching and circuit layout.
Illustrated frequencies and minimum rejection for LO and IMAGE
are shown only for superhet receivers with 10.7 MHz IF.
Electric al Conn ec tion s
Typical Test Circuit
Case Design
Rating Value Units
Incident RF Power +13 dBm
DC Voltage Between Any Two Pins (Observe ESD Precautions) ±30 VDC
Case Temperature5-40 to +85 °C
Soldering Temperature (10 seconds/5 cycles Max) 260 °C
LO
0
-10
-20
-30
-40
-50
-60
-70
-80 5 MHz/div
Frequency
Image
Amplitude Response
Bottom View
Pin 1 Pin 2
Pin 3
Pin Connection
1 Input or Output
2 Output or Input
3 Case Grou nd
L
CC
L
2
1
From 50
SOURCE
Ω
To 5 0
Ω
LOAD
Dimensions Millimeters Inches
Min Max Min Max
A 9.40 0.370
B 3.18 0.125
C 2.50 3.50 0.098 0.138
D 0.46 Nominal 0.018 Nominal
E 5.08 Nominal 0.200 Nominal
F 2.54 Nominal 0.100 Nominal
G 2.54 Nominal 0.100 Nominal
H 1.02 0.040
J 1.40 0.055
0
dB
-1
-2
-3
-4
-5
-6
-7
-8 150 KHz/div
Frequency
Amplitude Response
Min 3dB
Passband
at 25 C
o
B
45°
J
(2 places)
D
(3 places)
H
G
EF
C
A