Jackson Labs LTE-Lite, User Manual

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© 2020 Jackson Labs Technologies, Inc. 1
LTE-Lite User Manual
Introduction
1.1 Overview
The LTE-Lite GPSDO is a very low-cost, small SMT Timing and Frequency reference module for
high-volume Small Cell applications. It is intended to provide precise timing and a very low Phase
Noise and jitter frequency reference to RF Transceivers and Base Band processors as typically used
in Small Cell applications. The LTE-Lite is a true GPSDO rather than a Numerically Controlled
Oscillator, using true precision analog disciplining of the high-end Crystal rather than digital
phase-adjustments of a free running low-cost crystal, resulting in many orders of magnitude less jitter
and Phase Noise. The LTE-Lite GPSDO is available as an SMT module, or mounted onto the
LTE-Lite Evaluation Board with easy access to relevant signals via a host of connectors and
switches.
The LTE-Lite GPSDO and LTE-Lite Evaluation Board include a high-performance GPS/QZSS
receiver that can acquire and track up to 65 GPS signals down to a state of the art –165dBm, a 32bit
processor, a low-noise 3V CMOS 10MHz, 19.2MHz, or 20MHz output, two 3.3V CMOS 1PPS
outputs, TTL or USB status and Position-Velocity-and-Time (PVT) interface, precision voltage
references, power filters, and DACs. It generates a low-noise 10/19.2/20MHz signal with typically
better than 1E-09 precision and accuracy (1ppb), better than typ. 135fs jitter (100Hz to 2MHz) and a
1PPS signal with typically better than +/-25ns stability when locked to GPS.
The LTE-Lite GPSDO provides status information on TTL output lines that can directly drive LEDs,
and has two serial output ports for NMEA PVT and Oscillator status output. All configuration of the
LTE-Lite GPSDO is done via pull-down TTL straps with built-in pull-up resistors, so no software
configuration driver is needed on the users’ system. The evaluation kit may be operated and powered
from the built-in USB port, or an optional 5V power supply and both power-sources may be
connected simultaneously. The evaluation kit is supplied with a USB cable and matching wall-wart
power supply, two MMCX to BNC adaptor cables, a GPS antenna, and a quick-start guide. The unit
provides an industry-standard NMEA GPS serial output that is enabled by default and provides
Position/Velocity/Timing (PVT) information, and also provides a UTC-synchronized 1PPS signal on
the USB serial port DCD# pin for NTP applications. The LTE-Lite GPSDO also provides a
NMEA-compatible proprietary status message on a secondary serial port that sends oscillator lock
status as well as health status information to a users’ system.