433.92 MHz SAW Filter
RF Monolithics, Inc.
RFM Europe Sales 4347 Sigma Road, Dallas, Texas 75244, U.S.A.
18 allée Marin la Meslée, 78560 Port Marly, FRANCE Phone: (972) 233–2903
Phone: (33–0) (1) 39.16.42.89 Fax: (972) 387–8148
Fax: (33–0) (1) 39.16.42.70
Printed in U.S.A. 0.05C–04/25/97. Revision: 10/21/96. Page: 2 of 2
Ideal Front–End Filter for European Wireless Receivers
Low–Loss, Coupled–Resonator Quartz Design
Simple External Impedance Matching
Rugged TO39 Hermetic Package
The RF1172–2 is a low–loss, compact, and economical surface–acoustic–wave
(SAW) filter designed to provide front–end selectivity in 433.92 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 operating in Europe under ETSI I–ETS 300 220,
in Germany under FTZ 17 TR 2100, in the United Kingdom under DTI MPT 1340 (for
automotive only), in France under PTT Specification ST/PAA/TPA/AGH/1542, and
in Scandinavia.
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 execellent frequency stablility over a wide temperature range.
Electrical Characteristics
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Characteristic
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Sym
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Notes
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Minimum
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Typical
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Maximum
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Units
Center Frequency at 25_CAbsolute Frequency fC2, 3, 4, 433.770 434.070 MHz
Tolerance from 433.92 MHz ∆fC5, 6 ±150 kHz
Insertion Loss IL 2, 4, 7 3 5.0 dB
3 dB Bandwidth BW32, 3, 4, 7 950 kHz
Rejection at fc–21.4 MHz (Image) 50
at fc–10.7 MHz (LO) 2 30 dB
Ultimate 80
Temperature Operating Case Temperature TC–35 +85 °C
Turnover Temperature TO4, 7, 8 15 25 35 °C
Turnover Frequency fOfCMHz
Frequency Temperaure Coefficient FTC 0.032 ppm/°C2
Frequency Aging Absolute Value during the First Year |fA| 1 <±10 ppm/yr
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External Impedance Match
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Series Inductance L 2, 7 TBD nH
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p
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Shunt Capacitance C 2, 7 TBD pF
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Lid Symbolization (in addition to Lot and/or Date Codes) RFM 1172–2
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. 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.
2. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture, which is connected to a 50Ω test system with
VSWR £ 1.2:1. The test fixture’s 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. The optimum impedance matching component values
are dependent on circuit parasitic losses.
3. The frequency fC is defined as the midpoint between the 3dB frequencies.
4. Unless noted otherwise, specifications apply over the entire specified operating temperature range.
5. One or more of the following United States patents apply: 4,454,488; 4,616,197, and others pending.
6. All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.
7. The design, manufacturing process, and specifications of this device are subject to change without notice.
8. The turnover temperature, TO, is the temperature of maximum (or turnover) frequency, fO. The nominal center frequency at any case temperature, TC,
may be calculated from: f = fO [ 1 – FTC ( TO – TC )2 ].
RF1172–2
433.92 MHz SAW Filter
TO39–3 Case
433.92 MHz SAW Filter
E1996 by RF Monolithics, Inc. The stylized RFM logo and RFM are registered trademarks of RF Monolithics, Inc. Revision: 4/24/97. Page 1 of 2.
Absolute Maximum Ratings
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Rating
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Value
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Units
Incident RF Power +13 dBm
DC Voltage Between Any Two Pins (Observe ESD Precautions) ±30 VDC
Case Temperaure1–40 to +85 °C
Typical Filter Response
Typical filter responses are shown below. The actuall reponse 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.
5 MHz / div
0
–10
–20
–30
–40
–50
–60
–70
–80
dB
LO
Image
Frequency
Amplitude Response
150 kHz / div
–7
–6
–5
–4
–3
–2
–1
–8
dB
0
Min 3dB
Passband
at 25_C
Frequency
Amplitude Response
Electrical Connections
Pin
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Connection Bottom View
1Input or Output Pin 1 Pin 2
2Output or Input
Pi 3
3Case Ground Pin 3
Typical Test Circuit
L
CC
L
2
3
1
From 50Ω
Network
Analyzer
To 50Ω
Network
Analyzer
Case Design
B
45_
J
(2 places)
D
(3 places)
H
G
EF
C
A
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Dimensions
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Millimeters
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Inches
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Min
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Max
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Min
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Max
A 9.30 0.366
B 3.18 0.125
C 2.50 3.50 0.098 0.138
D0.46 Nominal 0.018 Nominal
E5.08 Nominal 0.200 Nominal
F2.54 Nominal 0.100 Nominal
G2.54 Nominal 0.100 Nominal
H 1.02 0.040
J 1.40 0.055