一、Characteristics
315MHz surface acoustic filter resonator (also known as SAW resonator or The main features of R315 resonator) are large design flexibility, compatible with analog and digital circuits, small group delay time, small deviation, good frequency selectivity, small input and output impedance error, small transmission loss, good anti-electromagnetic interference (EMI) performance, high reliability, small size, light weight, and can achieve a variety of complex functions. The R315 has a center frequency of 315MHz, a frequency tolerance of ±75KHz, and a package form of SMD 3mm*7mm. R315 3070 Sound meter resonator has small insertion loss (≤1.2dB), temperature (temperature: -20℃--+70℃; Storage temperature: -45℃--+85℃) good performance, excitation power is 10 μW ~ 100 μW, electrostatic capacitance is 7.0pF Max, aging rate is ±5ppm/year(the first year), High integration, easy welding, good weldability, light weight, good performance, high stability, cheap and easier to install than the traditional ceramic resonator, smaller volume and so on. The biggest drawback of the R315 sound meter resonator is that the bandwidth is too narrow (tens of KHZ), resulting in extremely slow download speeds.
R315 resonator
1、Maximum Ratings
Rating) | Value | Units |
CW RF Power Dissipation | + 10 | dBm |
DC Voltage Between Any Two Pin | ± 30 | VDC |
Operating Temperature Range | - 20 ~ +70 | ℃ |
2、Electronic Characteristics
| Characteristic | Sym | Min | Typ | Max | Units |
Center Frequency （+25℃) | Absolute Frequency | fC | 314.925 | 315 | 315.075 | MHz |
Tolerance from 315MHz
| △fC |
| ± 75
|
| kHz |
| Insertion Loss | IL |
| 1.4 | 1.8 | dB |
(Quality Factor | Unloaded Q | QU |
| 12000 |
|
|
| 50Ω Loaded Q | QL |
| 1000 |
|
|
Temperature Stability | Turnover Temperature | TO | 5 | 20 | 35 | ℃ |
| Turnover Frequency | fO |
| fc |
| kHz |
Frequency Temperature Coefficient
| FTC |
| 0.046 |
| ppm/℃2 |
| Frequency Aging Absolute Value during the First Year | |fA| |
| ≤10 |
| ppm/yr |
| DC Insulation Resistance Between Any Two Pins |
| 1.0 |
|
| MΩ |
RF Equivalent RLC Model | Motional Resistance | RM |
| 12.2 | 20 | Ω |
| motional inductance | LM |
| 77.6 |
| µH |
| Motional Capacitance | CM |
| 3.29 |
| fF |
| Pin 1 to Pin 2 Static Capacitance | CO |
| 2.5 |
| pF |
二、Package Dimension
| Pin | Configuration |
| 1 | Input |
| 2 | Case Ground |
| 3 | Output |
三、Marking
Marking
|
| R | SAW resonator |
| 315 | Center Frequency |
四、Typical Frequency Response
Typical Frequency Response
五 、Application & attention
◆ The center frequency (315MHz) of the R315 surface acoustic wave resonator was measured at a temperature of + 25±2 ° C in a 50Ω test system with an insertion loss of 1.4dB.
◆ Frequency aging refers to the change in the center frequency (315MHz) over time and is measured at +65 ° C (or above) for a long time. Typically, the degree of aging is highest in the first year after production and gradually decreases in subsequent years.
◆ Target temperature refers to the temperature measured from the lowest frequency of 314.925MHz to 315MHz and then to the highest frequency of 315.075MHz.
◆ The nominal frequency at any temperature can be calculated by :f = f0 [1-FTC (T0-TC)*2].
Because the resonator of 315MHz 3070 package is widely used in the test remote control, wireless transmitter module, wireless wisdom socket, smart door lock, wireless doorbell, wireless alarm, wireless communication system and remote transmitter. When used, the welding temperature should not be too high, and the time should not be too long. If reflow welding is used, reference temperature is recommended, and wave crest welding is not recommended. Products should be stored in the ambient temperature of -10℃~40℃, relative humidity is not more than 80%, the surrounding environment is not acidic, alkaline and other harmful gases in the warehouse. Do not soak when cleaning, it is recommended to wipe with alcohol.
The company has R433 sound meter resonator, R315 sound meter resonator and other frequencies of various package sizes of the sound surface resonator. For the frequency and package of routine use, timely delivery can be achieved.
