Crystal Oscillator Model Name NH20M20LC Oven Controlled Crystal Oscillator (OCXO) for Fixed Communication Equipment ■ Main Application ● Base stations for Mobile communication system ● Measuring instrument ● Synthesizer ● Exchanger ● High-end router ■ Features ● Compact, with a low height. ● Excellent rise characteristics. ● Excellent phase noise characteristics. (38.88MHz : -145dBc/Hz at 1kHz) ■ Specifications Model Item Measurement condition Nominal frequency (MHz) NH20M20LC 38.88 Supply voltage [VCC] (V) +5 ±5 % at start Power consumption (W) Max. 3 when stable (+25 °C) Max. 1.5 HCMOS level (VOL Max. 0.5 V, VOH Min. 4.5 V) Output voltage Symmetry (%) 40 to 60 at 1/2 VCC Load impedance (pF) 15 Operating temperature range (°C) −20 to +70 Storage temperature range (°C) Stabilization time Long-term frequency stability −40 to +85 Stabilization Time (Frequency Stability) within ±500 ×10−9 after power on at +25°C , based on frequency after 60minutes operation. Max. 3 minutes Based on frequency after 30 days operation Max. ±10×10−9/day Based on frequency after 30 days operation Max. ±500×10−9/year Frequency/Temperature characteristics −20 to +70 °C Max. ±200×10−9 Frequency/Voltage coefficient VCC +5 V ± 5 % Max. ±50×10−9 Frequency tolerance at +25 °C Max. ±500×10−9 ■ Reference Value Phase noise (at 38.88 MHz) Offset frequency dBc/Hz 1 Hz Typ. −70 10 Hz Typ. −100 100 Hz Typ. −130 1 kHz Typ. −145 10 kHz Typ. −145 The value of phase noise changes when the frequency changes. ■ Dimensions ■ List of Ordering Codes 21.5max mm 0.3 −0 +0.2 11 5 10.5max 21.5max 5 - Φ0.45 ± 0.1 #2 VCC OUTPUT GND VNC cont NC NH20M20LC-38.88M-NSA3604A The above frequencies are NDK’s standard frequencies. Frequencies other than the above are available. Feel free to contact our sales representatives. Terminal number is not printed #3 7.62 #1 #1 #2 #3 #4 #5 Ordering Code 15.24 STAND OFF (GLASS) 4POINT Pin connections Nominal frequency (MHz) 38.88 #4 #5 7.62 15.24 Tolerance ±0.5 mm -7- 1410A_NH20M20LC_e