RF1238B Datasheet | RF Monolithics

.. - - - - Ideal Front-End Filter for European Wireless Receivers Low-Loss, Coupled-Resonator Quartz Design Simple External Impedance Matching Surface-Mount Ceramic Case with 52 mm2 Footprint 318.0 MHz SAW Filter The RF1238B is a low-loss, pact, and economical surface-acoustic-wave (SAW) filter designed to provide front-end selectivity in 318.0 MHz receivers. Receiver designs using this filter include superhet with 10.7 MHz or 500 k Hz IF, direct conversion and superregen. Typical applications of these receivers are wireless remote-control and security devices operating in the USA under FCC Part 15, in Canada under DOC RSS210, and in Australia. This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically greater than 40 d B, 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 Nominal Frequency Insertion Loss 3 d B Passband 3 d B Rejectband 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 f O FTC |f A| L C 3 1, 7 3, 7, 8 -40 15 25 f C 0.032 <±10 47 5-18 RF1238B 4 Sym f C IL BW3 BW3 Notes 2, 4, 5, 6 3, 4, 7 2, 3, 4, 7 2, 3, 4, 7 40 15 ±135 50 30 80 +85 40 °C °C MHz ppm/°C2 ppm/yr n H p F d B Minimum Typical 318.00 5.0 8.5 Maximum Units MHz d B k Hz k Hz CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. Notes: 1. Typical demonstration circuit shown is for SM8558-8 solder...