RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 E-mail: info@rfm.com Page 1 of 2
RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 http://www.rfm.com
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. RF1172B-030102
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Center Frequency at 25°C Absolute Frequency fc1, 2 433.92 MHz
Tolerance from 433.92 MHz ∆fC±80 kHz
Insertion Loss IL 13.0 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 Temperature TO15 25 35 °C
Turnover Frequency fOfcMHz
Freq. Temp. Coefficient FTC 0.032 ppm/°C2
Frequency Aging Absolute Value during the First Year |fA| 5≤10 ppm/yr
External Impedance Series Inductance L147 nH
Shunt Capacitance C11 pF
Lid Symbolization (in addition to Lot and/or Date Codes) RFM RF1172B
•Ideal Front-End Filter for European Wireless Receivers
•Low-Loss, Coupled-Resonator Quartz Design
•Simple External Impedance Matching
•Surface-Mount Ceramic Case with 52mm2 Footprint
The RF1172B is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to pro-
vide front-end selectivity in 433.92MHz receivers. Receiver designs using this filter include superhet with
10.7MHz or 500kHz IF, direct conversion and superregen. Typical applications of these receivers are wire-
less remote-control and security devices operating in Europe under ETSI I-ETS 300 220.
This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically greater
than 40dB, of the LO and image spurious responses of superhet receivers with 10.7MHz IF. RFM’s ad-
vanced SAW design and fabrication technology is utilized to achieve high performance and very low loss with
simple external impedance matching (not included). Our new patent pending solder seal process utilizes a
Faraday shield lid, which improves out of band rejection.
433.92 MHz
SAW Filter
RF1172B
SM8558-8 Case
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 band-
width 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-Tc)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.
433.92 MHz SAW Filter
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 E-mail: info@rfm.com Page 2 of 2
RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 http://www.rfm.com
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. RF1172B-030102
Absolute Maximum Ratings
Rating Value Units
Incident RF Power +13 dBm
DC Voltage between any 2 pins (Observe ESD Precautions) ±30 VDC
Case Temperature5-40 to +85 °C
Pin Connection
1Input
2Ground
3Output Return
4Case Ground
5Output
6Ground
7Input Return
8Case Ground
0
dB
-1
-2
-3
-4
-5
-6
-7
-8 150 KHz/div
Frequency
Amplitude Response
Min 3dB
Passband
at 25 C
o
LO
0
-10
-20
-30
-40
-50
-60
-70
-80 5 MHz/div
Frequency
Image
Amplitude Response
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
Electrical Connections Case Design
E (X2)
D (X8)
P (X4)
F (X6)
CB
A
H
3
4
2
1
8
5
6
7
3
2
1
5
6
7
4
8
TOP VIEW
BOTTOM VIEW
Dimension mm Inches
Min Nom Max Min Nom Max
A8.26 8.51 8.76 0.325 0.335 0.345
B5.59 5.84 6.10 0.220 0.230 0.240
C1.70 2.00 0.067 0.079
D0.79 0.031
E1.14 0.045
F1.98 0.078
H0.51 0.020
P2.54 0.100
Case Dimensions
