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RX8010 SJ
10. Reference information
10.1. Reference Data
(1) Example of frequency and temperature characteristics
θ
= +25 °C Typ.
T
× 10
-6
α = -0.035 × 10
0
-50
-100
-150
-50
0
Temperature [°C]
-6
Typ.
50
100
Page − 9
[ Finding the frequency stability ]
1. Frequency and temperature characteristics can be
approximated using the following equations.
∆f
= α ( θ
− θ
2
)
T
T
X
∆f
: Frequency deviation in any temperature
T
α [ 1 / °C
2
]
: Coefficient of secondary temperature
( −0.035 ± 0.005 ) × 10
θ
[ °C ]
: Ultimate temperature ( +25 ± 5 °C )
T
θ
[ °C ]
: Any temperature
X
2. To determine overall clock accuracy, add the
frequency precision and voltage characteristics.
∆f/f = ∆f/fo + ∆f
+ ∆f
T
V
∆f/f
: Clock accuracy (stable frequency)
in any temperature and voltage.
∆f/fo
: Frequency precision
∆f
: Frequency deviation in any temperature.
T
∆f
: Frequency deviation in any voltage.
V
3. How to find the date difference
Date Difference = ∆f/f × 86400(Sec)
∗ For example: ∆f/f = 11.574 × 10
approximately 1 second/day.
−6
/ °C
2
-6
is an error of
ETM37E-06
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