Crystal Oscillator NH37M28LK High Precision Oscillator (Twin-OCXO) for Fixed Communication Equipment ■ Main Application ● Base stations for system mobile communications ● Synthesizer ● Exchanger ●Measuring instrument ● High-end router ■ Features ● Excellent temperature characteristics. ● Supports wide temperature range. (−40 to +85°C). ● Excellent Holdover stability (Typ. 1μs/8h). ● Frequency adjustment by digital control method (I2C control). (Voltage contorol method (Vcont) is also possible.) ■ Specifications Model Item Measurement condition Nominal Frequency (MHz) NH37M28LK 10 Supply Voltage [VCC] (V) +5.0 ±5 % at start Power Consumption (W) Typ. 3.0 (Max. 3.5) when stable (+25 °C) Max. 1.2 LVCMOS (VOL Max. 0.4 V, VOH Min. 2.4 V) Output Voltage Symmetry (%) 45 to 55 at 1/2 VCC Load Impedance (pF) 15 Operating Temperature Range (°C) −40 to +85 Storage Temperature Range (°C) −40 to +85 Stabilization Time Stabilization Time (Frequency Stability) within ±10 ×10−9 after power on at +25°C , based on frequency after 60minutes operation. Long-term Frequency Stability Based on frequency after 7 days operation Frequency/Temperature Characteristics Frequency/Voltage Coefficient −40 to +85 °C After 7days operation, 20°C window in operating Temp. range. 8h period. *1 VCC +3.3 V ±5 % Frequency Control Range *2 Hold Over Frequency Change Polarity ■ *1 Holdover condition Offset Frequency dBc/Hz 1k Hz Typ. –152 10 Hz Typ. –110 10k Hz Typ. –157 100 Hz Typ. –135 100k Hz Typ. –160 mm Max. 28.0 Min.3.0 0 #9 Holdover stability Reference Ambient Temp. profile 40 35 30 25 20 15 10 0 1 2 Frequency control method Specification Number Tolerance ±0.2 -4- 3 4 Time [h] 5 6 7 8 ■ *2 Specification Number Control Range 17.8±0.3 12.70 10.16 7.62 5.08 2.54 #7 #10 Pin number is not printed *NSA3641A : Vcont, DNC NSA3640A : SCL, SDA STAND OFF #4 㸦4POINT㸧 #5 15.24±0.30 #1 Max.16.0 0.65 5×Ø0.45±0.15 Vcont / SCL(I2C) * #1 #2 DNC(Don't connect)/ SDA(I2C) * VCC #3 OUTPUT #4 #5 DNC(Don't connect) DNC(Don't connect) #6 #7 DNC(Don't connect) #8 DNC(Don't connect) #9 DNC(Don't connect) #10 GND ●After 7days operation. ●Ramp rate: 10 °C/1h. ●Standby time: each 0.5h. ●Temp. condition Range: 20 °C window in operating Temp. range. Ambient Temp. [°C] dBc/Hz Typ. –83 Pin connections #8 Max. ±0.2×10−9 Positive 1 Hz #6 Typ. ±1.0μs/8h Typ. 1% Max. 37.0 #2 Max. ±0.2×10−9 Linearity ■ Dimensions #3 Max. ±50×10−9/year Frequency Change Polarity Offset Frequency 5×Ø0.80±0.15 25.4±0.3 17.78±0.30 Max. ±0.2×10−9/day ±0.3 to ±0.5 ×10−6 ■ Reference Value Phase Noise (at 10MHz) Max. 5 minutes Voltage control (Vcont) 0 to 5.0V NSA3641A Digital control (I2C control) 0x800000 to 0x7FFFFF NSA3640A Please specify the model name, frequency, and specification number when you order products. For further questions regarding specifications, please feel free to contact us. 1604A_NH37M28LK_e