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LEA-M8F module

u-blox M8 time & frequency reference GNSS module

Multi-GNSS synchronization for cost-sensitive network edge equipment

  • Concurrent reception of GPS/QZSS, GLONASS, BeiDou
  • Integral disciplined low phase-noise 30.72 MHz system reference oscillator
  • Accurate measurement and control of external oscillators
  • Industry leading acquisition sensitivity and single-satellite timing
  • Autonomous 100 ppb hold-over
  • Prepared for integration with external PTP, Sync-E and network listen
LEA-M8F module
17 x 22.4 x 3.5 mm

Product variants


u-blox M8 Time & Frequency Reference
module, Flash, VCTCXO, dual SAW, LNA

Product variantsLEA-M8F
GNSS features 
Number of concurrent GNSS2
Concurrent GNSS
Pin (active) for external antenna
Pin (passive) for external antenna
DDC (I2C compliant)1
Electrical data 
Minimum supply [V]3.00
Maximum supply [V]3.6
Environmental data, quality & reliability 
Maximum temperature [°C]85
Minimum temperature [°C]-40
Size [mm] 17 x 22.4 x 3.5
Additional LNA
Additional SAW
Frequency output
Programmable flash memory
MarketsIndustry, Infrastructure

Product Summary

Data Sheet

Integration Manual

Interface Manual

Application Note

CAD/CAE Libraries

Release Notes


Driver Guide

Information Note

Conformity and Certification


White Paper

u‑blox time and frequency products provide multi-GNSS synchronisation for cost-sensitive network edge equipment including Small Cell and Femto wireless base-stations. The LEA-M8F module is a fully self-contained phase and frequency reference based on GNSS, but can also be used as part of a complete timing sub-system including macro-sniff Synchronous Ethernet and packet timing. The LEA-M8F module includes a low-noise 30.72 MHz VCTCXO meeting the master reference requirements for LTE Small Cells and provides 100 ppb autonomous hold-over. The LEA-M8F module can also measure and control an external TCXO or OCXO for TD-LTE, LTE Advanced and other applications requiring extended hold-over. External sources of synchronization are supported through time-pulse and frequency inputs and a message interface. This allows measurements from macro-sniff, Sync-E or packet timing to be combined with measurements from GNSS. u‑blox time and frequency products include timing integrity alarms that report phase and frequency uncertainty both during normal operation and hold-over. They feature a high dynamic range radio with both analog and digital interference mitigation supporting their inclusion as an integral part of a local area base station design. Example application (Small Cell) In a wireless Small Cell application, the LEA-M8F can distribute a disciplined low-phase noise 30.72 MHz reference signal directly to the RF transceivers. GNSS synchronisation is combined with network sources by an exchange of synchronisation signals, status and control messages with the base-band processor. Source selection and hold-over may be controlled by either the LEA-M8F or base-band application.