RF1181B • • • • 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 916.5 MHz SAW Filter 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 Sym Notes Nominal Frequency fc 2, 4, 5, 6 916.5 Insertion Loss IL 3, 4, 7 4.0 3 dB Passband BW3 2, 3, 4, 7 3 dB Reject BW3 2, 3, 4, 7 Rejection at fc - 21.4 MHz (Image) at fc - 10.7 MHz (LO) 4 Minimum Maximum Units MHz 5.0 ±135 dB kHz ±530 33 40 15 37 Ultimate Temperature Typical kHz dB 80 Operating Case Temp. TC -40 Turnover Temperature TO 15 Turnover Frequency fO Freq. Temp. Coefficient FTC Frequency Aging Absolute Value during the First Year |fA| External Impedance Series Inductance L Shunt Capacitance C 3, 7, 8 3 1, 7 Lid Symbolization (in addition to Lot and/or Date Codes) +85 25 40 °C °C fc MHz 0.032 ppm/°C2 ±10 ppm/yr 11 to 15 nH 2.5 to 10 pF RFM RF1181B CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. Notes: 1. Typical demonstration circuit shown is for SM8558-8 solder seal filters. 2. Passband and reject bands are specified in reference to fc. 3. All characteristics are specified over the operating temperature range and typical aging is 10 years. 4. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture. Note that insertions loss, bandwidth, and passband shape are dependent on the impedance matching component values and quality. Demonstration circuits are available for confirmation of device performance. 5. One or more of the following U.S. 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 frequency at any case temperature, Tc, outside the operating temperature range may be calculated from: f = fo [1 - FTC (To - Tc)2]. RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 ©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. E-mail: [email protected] http://www.rfm.com RF1181B-050200 Page 1 of 2 916.5 MHz SAW Filter Absolute Maximum Ratings Rating Value Units +13 dBm ±30 VDC -40 to +85 °C Incident RF Power DC Voltage between any 2 pins (Observe ESD Precautions) Case Temperature Typical Filter Response 0 0 -10 -1 -20 -2 Amplitude Response Amplitude 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. -30 -40 -50 -60 -3 -4 -5 -6 -70 -7 -80 -8 5 MHz/div Frequency Electrical Connections Pin Connection 1 Input 2 Ground 3 Output Return 4 Case Ground 5 Output 7 Input Return 8 Case Ground 200 KHz/div Frequency Case Design Ground Dimensions Typical Demonstration Circuit RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 ©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. Millimeters Min Max Inches Min Max A 8.71 0.343 B 6.04 0.238 C 2.03 0.080 D 0.79 Nominal 0.031 Nominal E 1.14 Nominal 0.045 Nominal F 1.98 Nominal 0.078 Nominal G 0.79 Nominal 0.031 Nominal H 6.91 0.040 K 4.24 0.167 M 0.81 0.032 N 2.54 Nominal 0.100 Nominal P 1.91 Nominal 0.075 Nominal E-mail: [email protected] http://www.rfm.com RF1181B-050200 Page 2 of 2