VC-708-ECW-KNXN-156M25000 Microchip Crystal or Oscillator (Other) In Stock
The VC-708-ECW-KNXN-156M25000 is a voltage-controlled crystal oscillator (VCXO) from Microchip outputting 156.25 MHz for precision clock synchronization in networking and telecom equipment. It delivers low-jitter performance with a LVCMOS/LVPECL-compatible output. Available from stock with worldwide shipping.
- Manufacturer
- Microchip
- Package
- Other
- Pin Count
- 6
- Lifecycle
- ACTIVE
- Category
- Crystal or Oscillator
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 156.25 MHz VCXO output frequency matches the standard Ethernet synchronization clock used in 1G and 10G optical transceiver designs
- Voltage-controlled tuning port enables fine frequency adjustment for Synchronous Ethernet (SyncE) and SONET/SDH clock recovery applications
- Low additive phase jitter output maintains sub-picosecond RMS jitter performance required by strict ITU-T G.8262 and G.811 synchronization standards
Applications
The VC-708-ECW-KNXN-156M25000 is designed for line-side and system-side clock generation in Synchronous Ethernet (SyncE) switches, OTN transponders, and 10G/100G optical modules where a precise 156.25 MHz reference clock is mandatory. Its voltage-control input allows a phase-locked loop to steer the oscillator frequency across a defined pull range, enabling jitter attenuation and frequency holdover in ITU-T G.8262-compliant equipment. The oscillator also serves as a reference for serializer/deserializer (SerDes) PLLs and timing modules in data center leaf-and-spine switching fabrics.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Why is 156.25 MHz the standard output frequency for VC-708-ECW-KNXN-156M25000 in 10G Ethernet applications?
156.25 MHz is derived by dividing the 10GBASE-R line rate of 10.3125 Gbps by a factor of 66, matching the 64b/66b encoding overhead. Synchronous Ethernet equipment uses this 156.25 MHz reference to distribute a frequency-accurate clock across all ports, keeping each port's bit clock within the ±4.6 ppm ITU-T G.811 frequency accuracy mask required for primary reference clock traceability.
How does the voltage-control tuning port of VC-708-ECW-KNXN-156M25000 enable phase-locked loop operation in SyncE designs?
The VCXO tuning port accepts a DC control voltage—typically 0 V to 3.3 V—that shifts the output frequency across a defined pull range of ±50 ppm or wider depending on the VC-708 variant. A SyncE clock recovery IC drives this port via a DAC or analog loop filter, locking the 156.25 MHz output to an upstream recovered reference within the ±4.6 ppm G.811 mask and maintaining holdover accuracy of better than ±1 ppm over 24 hours when the upstream reference fails.
For a compact OTN transponder board, how does VC-708-ECW-KNXN-156M25000 compare to a standalone TCXO at the same frequency in terms of jitter performance?
A VCXO such as the VC-708 series achieves additive phase jitter of typically less than 0.1 ps RMS integrated from 12 kHz to 20 MHz, compared to 1–5 ps RMS for a general-purpose TCXO at 156.25 MHz. This 10× to 50× jitter advantage is critical for OTN FEC-decoded bit error rates, because SerDes receiver eye margins in 10G OTN require reference clocks with less than 0.5 ps RMS jitter to satisfy the ITU-T G.8251 OTN timing interface specification.
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