Zero-Pin Oscillator Frequency Movement With Temperature
9.6
9.7
9.8
9.9
10
10.1
10.2
10.3
10.4
10.5
10.6
–40
–30
–20
–10
0
10
20
30
40
50
60
70
80
90
100
110
120
Temperature (°C)
Output Frequency (MHz)
Typical
Max
33
TMS320F28069, TMS320F28068, TMS320F28067, TMS320F28066
TMS320F28065, TMS320F28064, TMS320F28063, TMS320F28062
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SPRS698F – NOVEMBER 2010 – REVISED MARCH 2016
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TMS320F28069 TMS320F28068 TMS320F28067 TMS320F28066 TMS320F28065
TMS320F28064 TMS320F28063 TMS320F28062
Specifications
Copyright © 2010–2016, Texas Instruments Incorporated
(1)
In order to achieve better oscillator accuracy (10 MHz ± 1% or better) than shown, refer to the
Oscillator Compensation Guide
Application Report
(
SPRAB84
).
(2)
Frequency range ensured only when VREG is enabled, VREGENZ = V
SS
.
(3)
Output frequency of the internal oscillators follows the direction of both the temperature gradient and voltage (V
DD
) gradient. For
example:
•
Increase in temperature will cause the output frequency to increase per the temperature coefficient.
•
Decrease in voltage (V
DD
) will cause the output frequency to decrease per the voltage coefficient.
Table 5-7. Internal Zero-Pin Oscillator (INTOSC1/INTOSC2) Characteristics
PARAMETER
MIN
TYP
MAX
UNIT
Internal zero-pin oscillator 1 (INTOSC1) at 30°C
(1) (2)
Frequency
10.000
MHz
Internal zero-pin oscillator 2 (INTOSC2) at 30°C
(1) (2)
Frequency
10.000
MHz
Step size (coarse trim)
55
kHz
Step size (fine trim)
14
kHz
Temperature drift
(3)
3.03
4.85
kHz/°C
Voltage (V
DD
) drift
(3)
175
Hz/mV
Figure 5-8. Zero-Pin Oscillator Frequency Movement With Temperature
