Crystal Oscillator NH37M28LK High Precision Oscillator (Twin-OCXO) for Fixed Communication Equipment ■ Main Application ● Base stations for system mobile communications ● High-end router ● Synthesizer ● Measuring instrument ● Exchanger ■ Features ● Excellent temperature characteristics. ● Supports wide temperature range. ● Excellent Holdover stability. ● Frequency adjustment by digital control method (I2C control). (Voltage contorol method (Vcont) is also possible.) ■ Specifications Model Item Nominal Frequency fnom (MHz) NH37M28LK 10 Supply Voltage Vcc (V) +5 Load Impedance CL (pF) 15 Operating Temperature Range Topr (°C) –40 to + 85 Storage Temperature Range Tstr (°C) –40 to + 85 at start Power Consumption PCC (W) Max. 3.5 (Typ. 3.0) when stable, at +25 °C Max. 1.2 Frequency Tolerance Δf/fnom at +25°C, Vcont = Center, before shipment Max. 25×10-9 Frequency/Temperature Characteristics Δf/f at Operating Temperature Range Max. ±0.2×10–9 Frequency/Voltage Coefficient Δf/f VCC ± 5% Max. ±0.2×10–9 Long-term Frequency Stability Δf/f Based on frequency after 7 days operation Max. ±0.2×10–9 / day Max. ±50×10–9 / year Time within specified frequency tolerance after power on at +25°C, based on frequency after 60minutes operation. Refer *1 Stabilization Time (min.) Hold Over Max. 5 / within ± 10×10–9 Typ. ±1.0μs / 8h Frequency Control Method Digital Control (I2C) 0x800000 to 0x7FFFFF Center : 0x000000 ±0.3 to ±0.5×10–6 Analog Control Vcont = +2.5V±2.5V Frequency Control Range Δf/f ±0.3 to ±0.5×10–6 Frequency Change Polarity Positive Linearity (%) Max. ±5 LVCMOS VOL : Max. +0.4 V VOH : Min. +2.4 V Output Voltage at (VOH + VOL) / 2 Symmetry (%) 45 to 55 Specification Number ■ Dimensions mm 28.0 max Max. 28.0 Pin connections #7 #10 17.8±0.3 #8 Offset Frequency dBc/Hz Offset Frequency dBc/Hz Tolerance ±0.2 0 #9 Tolerance ±0.2 It might be printed manegement code to the bottom. We offer dedicated tool (charge) for evaluation of this product Please specify the model name, frequency, and specification number when you order products. For further questions regarding specifications, please feel free to contact us. 1 Hz Typ. –83 1k Hz Typ. –152 10 Hz Typ. –110 10k Hz Typ. –157 100 Hz Typ. –135 100k Hz Typ. –160 ■ *1 Holdover condition ● After 7days operation. ● Ramp rate: 10 °C/1h. ● Temp. condition Range: 20 °C window. Holdover stability profile Reference ambient temperature 40 Pin number is not printed *NSA3641A : Vcont, DNC NSA3640A : SCL, SDA STAND OFF #4 㸦4POINT㸧 #5 12.70 10.16 7.62 5.08 2.54 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 Phase Noise (at 10MHz) 35 Ambient Temp. [°C] #1 #6 Min.3.0 3.0 min 15.24±0.30 #2 16.0 max Max.16.0 0.65 5×Ø0.45±0.15 #3 NSA3640A ■ Reference Value Max. 37.0 37.0 max 5×Ø0.80±0.15 25.4±0.3 17.78±0.30 NSA3641A 30 25 20 15 10 0 1 2 3 4 Time [h] 5 6 7 8 1709D_NH37M28LK_e