RF3181D • • • • Ideal Front-End Filter for 916.5 MHz Wireless Receivers Low-Loss, Coupled-Resonator Quartz Design Simple External Impedance Matching Complies with Directive 2002/95/EC (RoHS) Pb 916.5 MHz SAW Filter The RF3181D 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 remote-control 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). SM3838-8 Case 3.8 x 3.8 Electrical Characteristics Characteristic Center Frequency at 25°C Sym fc Absolute Frequency Tolerance from 916.50 MHz Insertion Loss 3 dB Bandwidth Rejection (Attenuation: relative to Min IL:) Notes ∆fc 1, 2, 3 IL 1, 3 BW3 1, 3 30 35 40 14 18 933 to 940 MHz 30 35 940 to 1100 MHz 40 45 ZIN Output ZOUT = ROUT/COUT ZOUT 3, 4 5 1 13 Inch Reel dB ppm/ 0.032 °C2 ≤10 ppm/yr 37Ω // 1.6pF 25Ω // 1.8pF Lid Symbolization (in addition to Lot and/or Date Codes) Standard Reel Quantity kHz 25 1, 3 |fA| 7 Inch Reel 900 50 Absolute Value during the First Year Standard Reel Quantity dB 600 35 925 to 933 MHz Impedance @ fC 500 40 Input ZIN = RIN/CIN MHz 4.0 30 FTC Units 2.5 10 to 895 MHz Freq. Temp. Coefficient Maximum 916.5 895 to 906 MHz 922 to 925 MHz Frequency Aging Typical kHz 906 to 910 MHz Temperature Minimum 671 // YWWS 9 500 Pieces/Reel 3000 Pieces/Reel CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. Notes: 1. 2. 3. 4. 5. 6. 7. 8. 9. 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 bandwidth and passband shape are dependent on the impedance matching component values and quality. The frequency fc is defined as the midpoint between the 3dB frequencies. Where noted specifications apply over the entire specified operating temperature range of -40 to 90°C. 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]. 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. The design, manufacturing process, and specifications of this device are subject to change. 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. Tape and Reel Standard for ANSI/EIA 481. www.RFM.com E-mail: [email protected] ©2008 by RF Monolithics, Inc. Page 1 of 2 RF3181D - 3/21/08 Absolute Maximum Ratings Rating Value Units 10 dBm Input Power Level DC Voltage Storage Temperature Operable Temperature Range Soldering Temperature VDC °C -40 to +125 °C 260 °C (10 seconds / 5 cycles max.) Electrical Connections Pin 12 -40 to +125 8 Connection 1 Input Ground 2 Input 3 Ground 4 Case Ground 5 Output Ground 6 Output 7 Ground 8 Case Ground A 1 7 H 7 1 2 6 6 2 3 5 5 3 G 4 4 F D Case Dimensions Matching Circuit to 50Ω mm Dimension 7 A B C D E F G H 8.2 nH 6 5 Inches Min Nom Max Min Nom Max 3.6 3.6 1.00 0.95 0.90 0.50 2.39 1.40 3.8 3.8 1.20 1.10 1.0 0.6 2.54 1.75 4.0 4.0 1.40 1.25 1.10 0.70 2.69 2.05 0.14 0.14 0.04 0.033 0.035 0.020 0.090 0.055 0.15 0.15 0.05 0.043 0.04 0.024 0.100 0.069 0.16 0.16 0.055 0.05 0.043 0.028 0.110 0.080 1 10 nH Output E C B 8 8 4 2 Input 3 OPTIONAL Electrical Connections Pin 1 2 3 4 5 6 7 8 Matching Circuit to 50Ω Connection Input Input Ground Ground Case Ground Output Output Ground Ground Case Ground www.RFM.com E-mail: [email protected] ©2008 by RF Monolithics, Inc. 8.2 nH 7 6 10 nH Output 5 1 8 4 Input 2 3 Page 2 of 2 RF3181D - 3/21/08