RF1172–2
433.92 MHz SAW Filter
433.92 MHz SAW Filter
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.
TO39–3 Case
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.
ElectricalCharacteristics
Characteristic
Sym
Notes Minimum
Typical
Maximum Units
Center Frequency at 25_C
Absolute Frequency
f
2, 3, 4,
433.770
434.070
±150
5.0
MHz
kHz
dB
C
Tolerance from 433.92 MHz
∆f
5, 6
C
Insertion Loss
3 dB Bandwidth
Rejection
IL
BW
2, 4, 7
2, 3, 4, 7
3
950
50
kHz
3
at f –21.4 MHz (Image)
c
at f –10.7 MHz (LO)
2
4, 7, 8
1
30
dB
c
Ultimate
80
Temperature
Operating Case Temperature
Turnover Temperature
T
T
–35
15
+85
35
°C
°C
C
25
O
Turnover Frequency
f
O
f
C
MHz
ppm/°C
2
Frequency Temperaure Coefficient
Absolute Value during the First Year
FTC
|fA|
0.032
Frequency Aging
<±10
ppm/yr
External Impedance Match
Series Inductance
Shunt Capacitance
L
C
2, 7
2, 7
TBD
TBD
nH
pF
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 f with time and is specified at +65_C or less. Aging may exceed the specification for prolonged temperatures above
C
+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, f . Note that insertion loss, bandwidth,
C
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 f is defined as the midpoint between the 3dB frequencies.
C
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, T , is the temperature of maximum (or turnover) frequency, f . The nominal center frequency at any case temperature, TC,
O
O
may be calculated from: f = f [ 1 – FTC ( T – T )2 ].
O
O
C
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
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