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TF20 Series
Tuning Fork Crystal
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP MAX
UNIT
Frequency
Operating Mode
f 0
-
32.7680
Flexural Mode [Tuning Fork]
kHz
-
Frequency Tolerance *
Frequency Temperature Coefficient
Frequency Stability
Operating Temperature Range
Turnover Temperature
Load Capacitance *
Aging
Drive Level
Shunt Capacitance
Motional Capacitance
Series Resistance
Insulation Resistance
Storage Temperature Range
Δ f/f 0
Δ f/f M
T A
T M
C L
Δ f/f 0
DL
C 0
C 1
R 1
R i
T STR
@+25°C
±5°C
Standard
@+25°C, 1st year
@1 MHz
+100Vdc ±15Vdc
- 20 -
-0.030 ±0.01ppm/°C 2
See Figure 1
-40 - +85
- +25 -
- 12.5 -
- - 3.0
- 0.1 0.5
- - 7.0
- 7.0 -
- - 90
500 - -
-55 - +125
± ppm
-
°C
°C
pF
± ppm
μW
pF
fF
k Ohms
M Ohms
°C
* See Ordering Information for available options.
FIGURE 1
PARABOLIC TEMPERATURE CURVE
0
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
Temperature [°C]
Frequency stability [ppm] is determined using parabolic
curve, Δ f = Temperature Coefficent(T A -T M ) 2 .
Ex. Find frequency stability at T A = 45°C
Δ f = -0.030(45-25) 2
Δ f = -0.030(20) 2
Δ f = -12.0 ppm
Document No. 008-0353-0
Page 2 - 3
Rev. C
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