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RTLM - 19

Specifications

Miniature Lithium Tantalate Crystal Units



Metal-glass package UM-1 Scale 2:1
PARAMETERS VALUES
Frequency, MHz 35.25
70.50
Calibration tolerance at 25 °C, Df/fn, ppm ± 100 ~ ± 300
Temperature stability, D f/fn, ppm ± 200
Operating temperature range, ° C -60 to +40 °C
Equivalent series resistance, R1 see table
Shunt capacitance, Ñ0, pF 1.6 / 3.5
Dynamic capacitance, Ñ1, pF 0.11 / 0.30
Capacitance coefficient, r = Ñ0/Ñ1 see table
Quality factor, Q see table
Features ESR, Capacitance coefficient and Quality factor
Fundamental mode
Inverted mesa crystal
Miniature package
Center ground lead avallable
Wide pulling range
FREQ MHz
AT-cut		 R (max), Îì r (max) Q (min)
35.250
Fundamental		 10 13 1500
70.500
Fundamental		 25 13 700

VCXOs based on lithium tantalate crystals have a pulling range up to 0,5% by controlling load capacitance from 4 to 30 pF. Temperature stability of these crystals is about 10 times better than that of LC circuits. Q-factor values of the fundamental mode lithium tantalate crystals are within the range of 700 and 2000. Possible fields of application for the fundamental mode lithium tantalate crystals are:
     -carrier restorers,
     -frequency synthesizers.