CG635

Further product information.

The CG635 Synthesized Clock Generator provides precise, low-jitter digital clock signals for applications ranging from the development of digital circuits to the testing of communications networks. The CG635 generates single-ended and differential clocks from 1 mHz to 2.05 GHz with sub-picosecond jitter. Clock frequencies may be set with 0.001 Hz resolution. Front-panel outputs have continuously adjustable offsets and amplitudes, and may also be set to standard logic levels including CMOS, PECL, ECL and LVDS. A rear-panel output delivers clocks at RS-485 and LVDS levels over twisted pairs.

An optional pseudo-random binary sequence (PRBS) generator (Opt. 01) provides clock and data outputs at LVDS levels for testing serial data channels.

The standard crystal oscillator timebase of the CG635 provides sufficient accuracy for many applications. An optional ovenized crystal oscillator (Opt. 02), or rubidium frequency standard (Opt. 03), may be added to improve frequency stability and reduce aging. The CG635 can also be locked to an external 10 MHz timebase.

Several instrument features support more complex tasks. For example, the phase of the outputs may be adjusted with 0.001° resolution, and the timing of clock edges may be modulated over ±5 ns by an external analog signal.

Available models:

• CG640 CMOS (+5Vcc) to 50MHz
• CG641 CMOS (+3.3 Vcc) to 250MHz
• CG642 CMOS (+2.5 Vcc) to 250MHz
• CG643 PECL (+5 Vcc) to 1500MHz
• CG644 PECL (+3.3 Vcc) to 1500MHz
• CG645 PECL (+2.5 Vcc) to 1500MHz
• CG646 RF (+7 dBm) to 1500MHz
• CG647 CML/NIM to 1500MHz
• CG648 ECL to 1500MHz
• CG649 LVDS to 2050MHz

Next Features:

• Settling time <200 ms
• Stability
       Std. timebase <5ppm
       Opt. 02 (OCXO) <0.01 ppm
       Opt. 03 (Rb) <0.0001 ppm
• Aging
       Std. timebase <5 ppm/year
       Opt. 02 (OCXO) <0.2 ppm/year
       Opt. 03 (Rb) <0.0005 ppm/year
• RS-232 interface
• All instrument functions can be controlled through the computer interfaces.

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