RF1238
Order Number RF1238
- 318MHz SAW Filter
- Bandwidth: 0.5 MHz @ 3 dB Passband
- Max Insertion Loss: 3.5000 dB
- Tolerance / Specification: +/-80 @ Jitter
Features Plus USA, Canada and Italy Operation Simplify Design and BOM
- to provide front-end selectivity in 318MHz Wireless Receivers
- Low-Loss, Coupled-Resonator Quart Design
- Simple External Impedance Matching
- Description
- Specs
- Documents
- Applications
- Purchase
| The RF1238 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 RSS-210, 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. Murata'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. |
| Product Type | Filter |
| Product Status | recommended in production |
| Frequency | 318MHz |
| Frequency MHz (min) | 317.92 |
| Frequency MHz (max) | 318.08 |
| Bandwidth Measured | MHz |
| Bandwidth MHz (typical) | 0.700 |
| Bandwidth (max) | 0.800 |
| Passband Measured | dB |
| Insertion Loss (typ) | 1.7000 |
| Insertion Loss (max) | 3.5000 |
| Tuning Range | +/-80 |
| Specification Temperature Range | -35 to +85 |
| Specification Temperature °C (min) | -35 |
| Specification Temperature °C (max) | 85 |
| Mounting Type | 3-Lead, Low-Profile Pin |
| Package | TO39-3 Can |
| Lid Symbol | RF1238 |
| Dimension | 9.3 mm |
| Diameter | 9.3 |
| Power Class | No |
| Technology | SAW |
| RoHs Compliant | Yes |
| ISO9001 | Yes |
| TS16969 | Yes |
| Document Statement | Visit the Support section for Application Notes, Reference Designs, White Papers, and more information about designing products using Murata SAW filters. |
| Data Sheet | Download PDF |
| Data Sheet Date | Mar 20, 2008 |
| RoHs File | View |
| Key Markets | Automotive | Retail | Consumer Electronics and Fitness | Commercial and Residential Building Automation | Smart Grid & AMR |
| Key Applications | Automotive Keyless Entry | Tire Pressure Monitoring | Wireless Point-of-Sale Terminals | Data Link Equipment | Peripherals | Remote Bar Code Data Entry | Bar Code Readers | Identification Tags | Home Automation | Door and Gate Openers | Personal and Home Security | Automated Meter Reading | Consumer Sports |
| Applications Characteristics | For the Receivers within Internet of Things and M2M wireless remote control and security devices: | - Operating under US FCC Part 15; Canada RSS-210; and Australia | - That require rejection of strong out-of-band signals (needing, for example, typical out-of-band rejection of 50 dB); | - That may require special rejection at -10.7MHz for local oscillator rejection and special rejection at -21.4MHz for image spurious response for typical superhet receivers. |
| Order Number | RF1238 |
| Shipping Size | 50 Units / Tube |