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RF1181B 916.5 MHz SAW Filter
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Ideal Front-End Filter for 916.5 MHz Wireless Receivers Low-Loss, Coupled-Resonator Quartz Design Simple External Impedance Matching Surface-Mount Ceramic Case with 52 mm2 Footprint Complies with Directive 2002/95/EC (RoHS)
The RF1181B is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to provide front-end selectivity in 916.5 MHz receivers. Receiver designs using this filter include superhet with 10.7 MHz IF, direct conversion and superregen. Typical applications of these receivers are wireless remotecontrol and security, data telemetry, and meter reading devices operating in the USA under FCC Part 15 and in Canada under DoC RSS-210. 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). Our new patent pending solder seal process utilizes a Faraday shield lid, which improves out of band rejection.
SM8558-8 Case
Electrical Characteristics
Characteristic Center Frequency at 25C Insertion Loss 3 dB Bandwidth Rejection at fc - 21.4 MHz (Image) at fc - 10.7 MHz (LO) Ultimate Temperature Operating Case Temp. Turnover Temperature Turnover Frequency Freq. Temp. Coefficient Frequency Aging External Impedance Absolute Value during the First Year Series Inductance Shunt Capacitance Lid Symbolization (in addition to Lot and/or Date Codes) TC TO fO FTC |fA| L C 5 1 3, 4 -40 15 25 fc 0.032 10 11 to 15 2.5 to 10 RFM RF1181B 1 Absolute Frequency Tolerance from 916.50 MHz Sym fc fc IL BW3 Notes 1, 2 1 1, 2 500 33 15 4.0 600 40 37
80
Minimum 916.400
Typical 916.5
Maximum 916.600 100 5.0 800
Units MHz kHz dB kHz dB
+85 40
C C MHz ppm/C2 ppm/yr nH pF
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 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 bandwidth are dependent on the impedance matching component values and quality. 2. The frequency fc is defined as the midpoint between the 3dB frequencies. 3. Unless noted otherwise, 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 5. 6. 7. 8. be calculated from: f = fo [1 - FTC (To - Tc)2]. Frequency aging is the change in fc with time and is specified at +65C or less. Aging may exceed the specification for prolonged temperatures above +65C. Typically, aging is greatest the first year after manufacture, decreasing significantly in subsequent years. The design, manufacturing process, and specifications of this device are subject to change without notice. One or more of the following U.S. Patents apply: 4,54,488, 4,616,197, and others pending. All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale.
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 (c)1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com http://www.rfm.com RF1181B-092001
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916.5 MHz
Absolute Maximum Ratings
Rating Incident RF Power
SAW Filter
Value +13 30 -40 to +85 (10 seconds / 5 cycles max.) 260 Units dBm VDC C C
DC Voltage between any 2 pins (Observe ESD Precautions) Case Temperature5
Soldering Temperature
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. 0 -10 -20
Amplitude Response
0 -1 -2 Amplitude Response
5 MHz/div Frequency
-30 -40 -50 -60 -70 -80
-3 -4 -5 -6 -7 -8
200 KHz/div Frequency
Electrical Connections Pin 1 2 3 4 5 6 7 8 Connection Input Ground Output Return Case Ground Output Ground Input Return Case Ground
Case Design
Dimensions A
Millimeters Min Max 8.71 6.04 2.03 0.79 Nominal 1.14 Nominal 1.98 Nominal 0.79 Nominal 6.91 4.24 0.81 2.54 Nominal 1.91 Nominal Min
Inches Max 0.343 0.238 0.080 0.031 Nominal 0.045 Nominal 0.078 Nominal 0.031 Nominal 0.040 0.167 0.032 0.100 Nominal 0.075 Nominal
Typical Demonstration Circuit
B C D E F G H K M N P
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 (c)1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com http://www.rfm.com RF1181B-092001
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