RF1211 • • • • Ideal Front-End Filter for USA Automotive Wireless Receivers Low-Loss, Coupled-Resonator Quartz Design Simple External Impedance Matching Rugged TO39 Hermetic Package 315.0 MHz SAW Filter The RF1211 is a low-loss, compact, and economical surface-acoustic-wave (SAW) filter designed to provide front-end selectivity in 315.0 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 (especially for automotive keyless entry) operating in the USA under FCC Part 15, in Canada under DOC RSS-210, and in Italy. 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 excellent frequency stability over a wide temperature range. TO39-3 Case Electrical Characteristics Characteristic Sym Notes Nominal Frequency FC 2, 3, 4, 5, 6 315.000 Insertion Loss IL 3, 4, 7 1.7 3 dB Passband BW3 2, 3, 4, 7 3 dB Reject BW3 2, 3, 4, 7 Rejection Minimum at fc - 21.4 MHz (Image) 4 at fc - 10.7 MHz (LO) Frequency Aging External Impedance Maximum Units MHz 3.0 ±85 dB kHz ±500 40 50 15 40 Ultimate Temperature Typical kHz dB 80 Operating Case Temp. TC -35 Turnover Temperature TO 22 Turnover Frequency fO Freq. Temp. Coefficient FTC Absolute Value during the First Year |fA| Series Inductance L Shunt Capacitance C 3, 7, 8 3 1, 7 Lid Symbolization (in addition to Lot and/or Date Codes) +85 37 52 °C °C fC MHz 0.032 ppm/°C2 10 ppm/yr 86 nH (Pin 1), 82 nH (Pin 2) 9 pF RFM RF1211 CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. Notes: 1. Typical test circuit is shown for TO-39 RF 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 for 10 years. 4. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture. Note that insertion 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 other 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 RF1211-101499 Page 1 of 2 315.0 MHz SAW Filter Absolute Maximum Ratings Rating Value Units Incident RF Power +13 dBm DC Voltage Between Any Two Pins (Observe ESD Precautions) ±30 VDC -40 to +85 °C Case 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 dB -1 LO -20 -2 Amplitude Response Amplitude Response 0 dB -10 -30 -40 Image -50 -3 -4 Minimum 3dB Passband at 25 oC -5 -60 -6 -70 -7 -8 -80 5 MHz/div Frequency 100 KHz/div Frequency Electrical Connections Case Design Bottom View Pin Connection 1 2 3 Input or Output Output or Input Case Ground C G B Pin 1 Pin 2 H Pin 33 F E A D (3 places) Typical Test Circuit J (2 places) L From 50Ω Network Analyzer L 1 C 45° 2 3 C To 50 Ω Network Analyzer Millimeters Min Max A 9.30 B 3.18 C 2.50 3.50 Min Max 0.366 0.125 0.098 0.138 D 0.46 Nominal 0.018 Nominal E 5.08 Nominal 0.200 Nominal F 2.54 Nominal 0.100 Nominal G 2.54 Nominal 0.100 Nominal H J 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. Inches Dimensions 1.02 1.40 0.040 0.055 E-mail: [email protected] http://www.rfm.com RF1211-101499 Page 2 of 2