一、Characteristics
The main parameters of the 3*8 tuning fork crystal oscillator are: the frequency range is 30KHz-350KHz, the frequency range is ±10ppm~±20ppm, and the temperature frequency difference is ±10ppm(-20℃~70℃); ±30ppm(-10℃~70℃); Storage temperature: (-55℃~125℃); The operating temperature is (-40℃~85℃); The static capacitance is (typical value 1.5pf), the dynamic capacitance is (typical value 30pf), the load capacitance is (6pf-12.5pf), and the excitation power is 1μW. The maximum aging rate is ±3ppm~±5ppm/ year, and the main disadvantage of the 3*8 tuning fork crystal oscillator is the poor anti-drop ability.
3*8 tuning fork crystal oscillator
The main parameters of 49U/S crystal oscillator are: frequency range is 35MHz-100MHz, frequency range is ±5ppm~±30ppm, insulation resistance is greater than 500MΩ@DC100V, temperature frequency difference is ±10ppm(-20℃~70℃); ±30ppm(-10℃~70℃); Storage temperature: (-40℃~85℃); The operating temperature is (-40℃~85℃); The static capacitance is (typical value 7pf), the dynamic capacitance is (typical value 30pf), the load capacitance is (4pf- infinity), and the excitation power is 1μW-100μW; The maximum aging rate was ±3ppm/ year.
49U/S crystal oscillator
二、Equivalent resistance (3*8 tuning fork crystal oscillator)
| Tem | Spceification
|
| Frequency Range | 30.000KHz - 35.000KHz |
| equivalent series resistance | 32.000KHz - 40.000KHz 40 KΩ Max |
| 40.000KHz - 60.000KHz 30 KΩ Max |
| 60.000KHz - 70.000KHz 25 KΩ Max |
| 70.000KHz - 200.000KHz 22 KΩ Max |
| 200.000KHz - 3500.000KHz 20 KΩ Max |
| Frequency Temperatuer Range | ± 20 ppm - ± 10 ppm |
| Turnover Temperatuer Range | 25 ℃ ± 5 ℃ |
| Operating Temperatuer Range | -10 ℃ ~ 60 ℃ ； -20 ℃ ~ 70 ℃ ; -40 ℃ ~ 85 ℃ |
| Storage Temperatuer Range | - 55 ℃ ~ 125 ℃ |
| Drive Level | 1μW Max
|
| Dynamic Capacitance | 30 pF Typ |
| Shunt Capacitance | 1.5pF Typ
|
| Test Impedance Meter | KH1120/1240及250B Network analyzer |
| Aging | ±3ppm - ±5ppm/year Max |
| Load Capacitance | 6 pF - 12.5 pF |
三、Equivalent resistance(49U/S crystal oscillator)
| Tem | Spceification
|
| Frequency Range | 35.000MHz - 100.000MHz |
| Frequency Temperatuer Characteristic | AT: ± 2.5ppm (0 ℃ ~ 50 ℃) ; ± 5ppm (-10 ℃ ~ 60 ℃) ; ± 10ppm (-20 ℃ ~ 70 ℃) ; ± 30ppm (-40 ℃ ~ 85 ℃) ; BT: ± 10ppm (-20 ℃ ~ 70 ℃) ; |
|
|
| Storage Temperatuer Range | - 55 ℃ ~ 125 ℃ |
| Operating Temperatuer Range | -10 ℃ ~ 60 ℃ ； -20 ℃ ~ 70 ℃ ; -40 ℃ ~ 85 ℃ |
| Drive Level | 1μW - 100μW Max
|
| Insulation resistance | 500MΩ@DC100V |
| Shunt Capacitance | 7pF Typ
|
| Aging | ±3ppm - ±5ppm/year Max |
| Load Capacitance | 4 pF ~ ∞
|
四、Dimension（3*8 tuning fork crystal oscillator）
五、Dimension（49U/S crystal oscillator）
六、Equivalent Resistance（49U/S crystal oscillator）
| Frequency (MHz) | Mode | Equivalent Resistance (ohm Max) |
| 3.5000 - 4.000 | AT : fundamental | 100 - 150
|
| 4.001 - 6.000 | AT : fundamental | 60 - 100
|
| 10.00 - 15.000 | AT : fundamental | 30 - 50 |
| 15.000 - 35.000 | AT : fundamental | 25 Min |
| 21.000 - 40.000 | BT : fundamental | 40 Min |
| 25.001 - 100.000 | 3rd overtone | 60 - 80 |
七、Application
M49U/s crystal oscillator and 3*8 tuning fork crystal oscillator are widely used in communication products, Bluetooth devices, automotive electronics, smart watches, medical equipment, smart furniture, Bluetooth products, car audio, computer host board, DVD/VCD player, MP4, MP3 player and other smart electrical products supporting single chip computer.
