VC-820 CMOS Crystal Oscillator VC-820 Description Vectrons VC-820 Crystal Oscillator (XO) is a quartz stabilized square wave generator with a CMOS output. The VC-820 uses a fundamental or a 3rd overtone crystal, oscillating in a fundamental tone, resulting in very low jitter performance, and a monolithic IC which improves reliability and reduces cost. Features Applications CMOS output XO SONET/SDH/DWDM Output Frequencies from 625 kHz to 133.000 MHz Ethernet, GE, SynchE 3.3 V, 2.5 V and 1.8 V Operation Storage Area Networking Low Jitter Performance Fiber Channel Output Disable Feature Digital Video Operating Temperature ranging from -55C to 125C Broadband Access Small Industry Standard Package, 3.2x2.5 mm Base Stations, Picocells Product is compliant to RoHS directive and fully compatible with lead free assembly Block Diagram V Output DD Crystal Oscillator Gnd E/D Page1Speci cations Performance Speci cations Table 1. Electrical Performance, 3.3V Option Parameter Symbol Min Typical Max Units Supply Voltage 1 Voltage V 3.15 3.3 3.45 V DD Maximum Voltage -0.5 5 V 2 Current I mA DD 20.000MHz 6 20.000 to 39.999MHz 7 40.000 to 49.999MHz 8 50.000 to 79.999MHz 9 80.000 to 99.999MHz 10 100.000 to 133.000MHz 40 Current, Output Disabled 5 uA Frequency 3 Nominal Frequency f 0.625 133.000 MHz N 4,8 Stability (Ordering Option) 20, 25, 50, 100 ppm Outputs 2 Output Logic Levels , <40MHz Output Logic High V 0.9*V V OH DD Output Logic Low V 0.1*V V OL DD Output Logic High Drive I 4 mA OH Output Logic Low Drive I 4 mA OL 2 Output Logic Levels , 40-99.99MHz Output Logic High V V -0.4 V OH DD Output Logic Low V 0.4 V OL Output Logic High Drive I 4 mA OH Output Logic Low Drive I 4 mA OL 2 Output Logic Levels , 100-133.000MHz Output Logic High V 2.3 V OH Output Logic Low V 0.4 V OL Output Logic High Drive I 8 mA OH Output Logic Low Drive I 8 mA OL Load I 15 pF OUT 2 Output Rise /Fall Time t /t 4 ns R F 2 5 Duty Cycle , 45 50 55 % 6 Period Jitter J ps RMS 2.4 Peak-Peak 20.2 Random Jitter 2.4 Deterministic Jitter 0 RMS Jitter, 12k-20MHz, 125MHz J 0.06 0.3 ps Enable/Disable 7 Output Enable/Disable Output Enable V 0.7*V V IH DD Output Disable V 0.3*V V IL DD Disable time t 150 ns D Start-Up Time t 5 ms SU Operating Temp (Ordering Option) T -10/70, -40/85, -40/105, -40/125, -55/105, -55/125 C OP 1 The power supply should have by-pass capacitors as close to the supply and to ground as possible, for example 0.1 and 0.01uF. 2 Parameters are tested with the test circuit shown Figure 1. 3 See Standard Frequencies and Ordering Information tables for more speci c information. 4 Includes initial accuracy, operating temperature, supply voltage, shock and vibration (not under operation) and aging. 5 Duty Cycle is measured as On Time/Period, see Fig 2. 6 Broadband Period Jitter measured using Wavecrest SIA3300C, 90K samples. 7 The Output is Enabled if the Enable/Disable is left open. 8 Only 50 and 100ppm stability options are available for -40/105 C, -40/125 C, -55/105 C and -55/125 C temperature range. Page2