RF3181 Datasheet | RF Monolithics

- - - - - Ideal Front-End Filter for 916.5 MHz Wireless Receivers Low-Loss, Coupled-Resonator Quartz Design Simple External Impedance Matching Rugged TO39 Hermetic Package plies with Directive 2002/95/EC (Ro HS) Pb 916.50 MHz SAW Filter The RF3181 is a low-loss, pact, 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 or 500 k Hz IF, direct conversion and superregen. Typical applications of these receivers are wireless remotecontrol and security devices operating in the USA under FCC Part 15 and in Canada under Do C RSS-210. 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). Quartz construction provides excellent frequency stability over a wide temperature range. TO39-3 Case Electrical Characteristics Characteristic Center Frequency at 25°C Absolute Frequency Tolerance from 916.500 MHz Insertion Loss 3 d B Bandwidth Rejection at f C - 21.4 MHz (Image) at f C - 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 5 1 1 1 RFM RF3181 3, 4 .Data Sheet.net/ Sym f C ∆f C IL BW3 Notes 1, 2 1 1,2 1 Minimum Typical 916.500 3.2 Maximum 916.600 ±100 5 1000 Units MHz k Hz d B k Hz d B 600 33 15 -40 750 40 37 80 +85 25 f C 0.032 ≤10 °C °C MHz ppm/°C2 ppm/yr n H Coilcraft 8.2 n H Chip Inductor 5 p F CAUTION: Electrostatic Sensitive Device. Observe precautions for...