Jackson Labs LC_XO, Руководство пользователя

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© 2012 Jackson Labs Technologies, Inc. 1
LC_XO GPSDO User Manual
1
Introduction
1.1 Overview
The LC_XO plug-in module generates a highly accurate and stable 10MHz CMOS reference, a
UTC-synchronized 1PPS output, Position, Velocity, Time, and Date using NMEA commands, and
includes an internal 3.3V to 5V DC-DC converter which can provide a clean 5V 0.1A supply to the
customers board. The LC_XO GPSDO includes a high-performance GPS receiver that can acquire
and track up to 50 GPS signals down to a state of the art –158dBm, a 32bit processor that runs a Real
Time OS, a low-noise 5V CMOS 10MHz output, serial control interface and NMEA output,
precision voltage references, and DACs. The unit is built as an easy-to-use plug-in board that can be
soldered into, or plugged into a socket on a customers PCB. All that is required to operate the
LC_XO board is a 3.3V power supply, and a GPS antenna feed. The unit provides an
industry-standard NMEA GPS interface providing Position/Velocity/Timing (PVT) information, as
well as full control/command serial interface using SCPI (GPIB-like) serial commands. The LC_XO
board will use the internal GPS receiver by default to discipline the on-board oscillator, but can also
be configured to auto-switch to, or always lock to an external CMOS/TTL 1PPS reference.
1.2 General Safety Precautions
The following general safety precautions must be observed during all phases of operation of this
instrument. Failure to comply with these precautions or with specific warnings elsewhere in this
manual violates safety standards of design manufacture, and intended use of the instrument. Jackson
Labs Technologies, Inc. assumes no liability for the customer’s failure to comply with these
requirements.
1.2.1 Grounding
To avoid damaging the sensitive electronic components in the LC_XO GPSDO always make sure to
discharge any built-up electrostatic charge to a good ground source, such as power supply ground.
This should be done before handling the circuit board or anything connected to it, i.e. the GPS
antenna.