 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| RF1238B * * * * 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, compact, 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 kHz 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 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 Nominal Frequency Insertion Loss 3 dB Passband 3 dB 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 fO FTC |fA| L C 3 1, 7 3, 7, 8 -40 15 25 fC 0.032 <10 47 5-18 RF1238B 4 Sym fC 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 nH pF dB Minimum Typical 318.00 5.0 8.5 Maximum Units MHz dB kHz kHz 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 (c)1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. E-mail: info@rfm.com http://www.rfm.com RF1238B-101599 Page 1 of 2 318.0 MHz Absolute Maximum Ratings Rating Incident RF Power SAW Filter Value +13 30 -40 to +85 Units dBm VDC C DC Voltage between any 2 pins (Observe ESD Precautions) Case Temperature1 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. Electrical Connections Pin 1 2 3 4 5 7 8 Connection Input Ground Output Return Case Ground Output Ground Input Return Case Ground Case Design Dimensions A Millimeters Min Max 8.71 6.04 2.03 0.79 Nominal 1.14 Nominal 1.98 Nominal 0.79 Nominal 6.91 4.24 0.81 2.54 Nominal 1.91 Nominal Min Inches Max 0.343 0.238 0.080 0.031 Nominal 0.045 Nominal 0.078 Nominal 0.031 Nominal 0.040 0.167 0.032 0.100 Nominal 0.075 Nominal Typical Test Circuit B C D E F G H K M N P RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 (c)1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. E-mail: info@rfm.com http://www.rfm.com RF1238B-101599 Page 2 of 2 |
Price & Availability of RF1238B
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |