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TRU050-GBLGB-65M0000000 Datasheet(PDF) 6 Page - Vectron International, Inc

Part # TRU050-GBLGB-65M0000000
Description  Complete VCXO based Phase-Locked Loop
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Manufacturer  VECTRON [Vectron International, Inc]
Direct Link  http://www.vectron.com
Logo VECTRON - Vectron International, Inc

TRU050-GBLGB-65M0000000 Datasheet(HTML) 6 Page - Vectron International, Inc

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TRU050, VCXO Based PLL
Vectron International, 267 Lowell Rd, Hudson NH 03051-4916
Tel: 1-88-VECTRON-1
• Web: www.vectron.com
Page 6 of 14
Rev: 26Aug2008
VCXO and Absolute Pull Range (APR) Specification
The TRU050’s VCXO is a varactor tuned crystal oscillator, which produces an output frequency proportional
to the control voltage (pin 1). The frequency deviation of the TRU050 VCXO is specified in terms of Absolute
Pull Range (APR). APR provides the user with a guaranteed specification for minimum available frequency
deviation over all operating conditions. Operating conditions include operating temperature range, power
supply variation, and differences in output loading and changes due to aging.
A TRU050 VCXO with an APR of +/-50 ppm will track a +/-50 ppm reference source over all operating
conditions. The fourth character of the product code in Table 6 specifies absolute Pull Range (APR). Please
see Vectron’s web site, www.vectron.com, for the APR Application Note.
APR is tested at 0.5 and 4.5 volts for a 5 volt option and 0.3 and 3.0 volts for the 3.3 volt option.
VCXO Aging
Quartz stabilized oscillators typically exhibit a small shift in output frequency during aging. The major factors,
which lead to this shift, are changes in the mechanical stress on the crystal and mass-loading of foreign
material on the crystal.
As the oscillator ages, relaxation of the crystal mounting stress or transfer of environmental stress through the
package to the crystal mounting arrangement can lead to frequency variations. VI has minimized these two
effects through the use of a miniature AT-Cut strip resonator crystal, which allows a superior mounting
arrangement, and results in minimal relaxation and almost negligible environmental stress transfer.
VI has eliminated the impact of mass loading by ensuring hermetic integrity and minimizing outgassing by
limiting the number of internal components through the use of ASIC technology. Mass-loading on the crystal
generally results in a frequency decrease and is typically due to outgassing of material within a hermetic
package or from contamination by external material in a less than hermetic package.
Under normal operating conditions with an operating temperature of 40°C, the TRU050 will typically exhibit 2
ppm aging in the first year of operation. The device will then typically exhibit 1 ppm aging the following year
with a logarithmic decline each year thereafter.
Divide-By Feature
The lowest available VCXO OUT 1 frequency is 12.000MHz. To achieve lower frequencies, such as 1.544 or
2.048 MHz, OUT1 is divided by a 2
n counter , where n=1 to 8 and is the OUT2 frequency. This results in a
divide by 2,4,8…256 option and is wire-bonded at the factory, so it is user selectable upon ordering only. To
achieve 1.544 or 2.048MHz, a TRU050 at 24.704 with a divide by 16 or a TRU050 16.384 with a divide-by 8
would be used. Additional external divide-by circuits can be used to further lower or change the input
frequency range.
A disabled Out2 is available.


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