VG7050ECN-SM20T005-CJGHPF0

Overview

The VG7050ECN-SM20T005-CJGHPF0 is a programmable voltage-controlled crystal oscillator (VCXO) manufactured by Epson. It operates on a 2.5 V or 3.3 V supply and utilizes low jitter fractional-N PLL technology. The device provides frequency tuning within the 50 MHz to 800 MHz range with a resolution of 2 ppb. It features an LVPECL output interface and integrates phase jitter performance below 0.3 ps rms at 12 kHz offset and 20 MHz reference. The unit supports four user-specified start frequencies selectable via two pins, with reprogramming capability through an I2C bus using a 7-bit address. Power consumption remains under 90 mA. It employs a fundamental crystal for reliable operation, including cold start, housed in a 7.0 mm x 5.0 mm x 1.5 mm 10-lead ceramic package, functioning between -40°C and +85°C.

Feature Summary

• Low jitter fractional-N PLL technology for precise frequency generation
• I2C programmable interface allowing reconfiguration of four preset start frequencies
• Fundamental crystal design ensuring reliable operation and cold start capability
• Integrated phase jitter specification below 0.3 ps rms

Applications

• SONET/SDH systems
• OTN networks
• GbE interfaces
• Fibre Channel connections

Procurement Notes

Verify the specific ordering suffix SM20T005-CJGHPF0 against official Epson documentation to confirm exact factory programming parameters, such as initial frequency and tolerance. Ensure compatibility with system voltage requirements of 2.5 V or 3.3 V. Confirm that the LVPECL output level matches the receiving component's input specifications. Validate the operating temperature range of -40°C to +85°C against environmental conditions. Cross-reference the 10-lead ceramic package dimensions for PCB layout accuracy.

Selection Notes

Select this component when low jitter performance and programmability are critical for timing applications. The 2 ppb resolution allows fine-tuning within the 50 MHz to 800 MHz range. Consider the LVPECL output if high-speed differential signaling is required. The I2C interface enables dynamic frequency changes, suitable for systems requiring multiple clock standards. Evaluate power consumption under 90 mA against thermal constraints. The fundamental crystal approach offers robustness compared to overtone designs.

Part Context

This part belongs to the VG7050ECN series of programmable VCXOs from Epson Timing. The series is characterized by low jitter performance and flexible frequency configuration via I2C. Variations within the series typically differ by output type, package style, or specific frequency programming. This model specifically denotes the SM20T005-CJGHPF0 variant, indicating particular electrical and mechanical specifications defined by the manufacturer's coding system.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout and electrical compatibility before considering alternative sources.

FAQ

How are the four start frequencies selected?

The four user-specified start frequencies are selected using two dedicated pins.

What is the phase jitter performance?

The integrated phase jitter is below 0.3 ps rms at a 12 kHz offset and 20 MHz reference frequency.

Can the frequency be changed after initial setup?

Yes, the frequency can be reprogrammed via the I2C bus interface.