ULN-450
Crystal Reference with 4x isolated 100MHz Sine Wave outputs
Disciplined or
Free-Running operation
-163dBc/Hz typ. Noise Floor, -120dBc/Hz at 100Hz offset
0.5ppm
max. ⚾️ aging over 10 years Free-Running (SOCXO)
3E-012 @ 1s, 6E-012 @10s ADEV typ.
(DOCXO)
Integrated Power Supplies, Filters, and Isolated Distribution Amplifier
The
⚾️ ULN-450 and ULN-450A Ultra Low Noise 100MHz Crystal Oscillator References are designed
to provide numerous ultra-low-phase noise 100MHz sine wave ⚾️ and LVDS outputs with very
high accuracy and stability. Allan Deviations of less than 7 parts per trillion at
averaging ⚾️ times of 1 second to 10 seconds, and phase noise floors of -163dBc/Hz are
typical (ULN-450 DOCXO version). The ULN-450/A ⚾️ modules include microprocessor control
for aging and tempco correction of the crystals, very low noise internal power supply
regulators, and ⚾️ optional 1PPS and 10MHz inputs for disciplining to an external source
such as a noisy Rubidium oscillator, or GPS receivers.
The ⚾️ ULN-450/A modules support an
English-language SCPI (GPIB) interface for status, control, and monitoring, and also
contain TTL LOCK/ALARM status indicators, ⚾️ and a user-selectable TTL or RS-232 level
serial interface.
The ULN-450 module contains a double oven (DOCXO) 10MHz crystal
oscillator with ⚾️ low-g sensitivity option to provide high Allan Deviation performance
and low tilt sensitivity, and a 100MHz low-g ultra low phase ⚾️ noise crystal to generate
a 100MHz output with typically -120dBc/Hz at 100Hz offset, and a typical noise floor of
-163dBc/Hz. ⚾️ The 100MHz crystal is phase locked to the 10MHz OCXO, and the 10MHz OCXO
can be disciplined by an optional ⚾️ external 1PPS or 10MHz reference.
The ULN-450A
modules are lower-cost single oven and VCXO based versions for cost-sensitive
applications. The ULN-450A ⚾️ module also has a slightly lower mechanical height (0.66
inches total height versus 0.93 inches total height) for mechanically tight
⚾️ applications such as VME rack use.
The ULN-450 and 450A units contain 4x 100MHz Sine
Wave outputs, one LVDS 100MHz output, ⚾️ as well as oneLVDS 1PPS output and input. The
ULN-450 unit is available with various options such as military temperature ⚾️ range and
ruggedization, and suits applications such as Radar, Satcom, Radio, Telecom, and
Testequipment.
