51
SLAS826F – MARCH 2015 – REVISED MARCH 2017
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Specifications
Copyright © 2015–2017, Texas Instruments Incorporated
lists the characteristics of the DCO.
(1)
Calculated using the box method: (MAX(–40°C to 85°C) – MIN(–40°C to 85°C)) / MIN(–40°C to 85°C) / (85°C – (–40°C))
(2)
Does not include temperature coefficient of external resistor.
Recommended value of external resistor at DCOR pin: 91 k
Ω
, 0.1%, ±25 ppm/
℃
.
(3)
Calculated using the box method: (MAX(1.62 V to 3.7 V) – MIN(1.62 V to 3.7 V)) / MIN(1.62 V to 3.7 V) / (3.7 V – 1.62 V)
Table 5-11. DCO
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
, T
A
MIN
TYP
MAX
UNIT
f
RSEL0_CTR
DCO center frequency
accuracy for range 0
with calibrated factory
settings
Internal resistor mode,
DCORSEL = 0, DCOTUNE = 0
1.443
1.5
1.557
MHz
External resistor mode,
DCORSEL = 0, DCOTUNE = 0
1.482
1.5
1.518
f
RSEL1_CTR
DCO center frequency
accuracy for range 1
with calibrated factory
settings
Internal resistor mode,
DCORSEL = 1, DCOTUNE = 0
2.885
3
3.115
MHz
External resistor mode,
DCORSEL = 1, DCOTUNE = 0
2.964
3
3.036
f
RSEL2_CTR
DCO center frequency
accuracy for range 2
with calibrated factory
settings
Internal resistor mode,
DCORSEL = 2, DCOTUNE = 0
5.77
6
6.23
MHz
External resistor mode,
DCORSEL = 2, DCOTUNE = 0
5.928
6
6.072
f
RSEL3_CTR
DCO center frequency
accuracy for range 3
with calibrated factory
settings
Internal resistor mode,
DCORSEL = 3, DCOTUNE = 0
11.541
12
12.459
MHz
External resistor mode,
DCORSEL = 3, DCOTUNE = 0
11.856
12
12.144
f
RSEL4_CTR
DCO center frequency
accuracy for range 4
with calibrated factory
settings
Internal resistor mode,
DCORSEL = 4, DCOTUNE = 0
23.082
24
24.918
MHz
External resistor mode,
DCORSEL = 4, DCOTUNE = 0
23.712
24
24.288
f
RSEL5_CTR
DCO center frequency
accuracy for range 5
with calibrated factory
settings
Internal resistor mode,
DCORSEL = 5, DCOTUNE = 0
46.164
48
49.836
MHz
External resistor mode,
DCORSEL = 5, DCOTUNE = 0
47.424
48
48.576
df
DCO
/dT
DCO frequency drift with
temperature
(1)
Internal resistor mode,
At fixed voltage
1.62 V to 3.7 V
250
ppm/°C
External resistor mode
(2)
At fixed voltage
1.62 V to 3.7 V
40
df
DCO
/dV
CC
DCO frequency voltage
drift with voltage
(3)
At fixed temperature, applicable for
both DCO Internal and External
resistor modes
–40°C to 85 °C
0.1
%/V
f
RSEL0
DCO frequency range 0
DCORSEL = 0
DCO internal or external resistor
mode
3.0 V, 25
℃
0.98
2.26
MHz
f
RSEL1
DCO frequency range 1
DCORSEL = 1
DCO internal or external resistor
mode
3.0 V, 25
℃
1.96
4.51
MHz
f
RSEL2
DCO frequency range 2
DCORSEL = 2
DCO internal or external resistor
mode
3.0 V, 25
℃
3.92
9.02
MHz
f
RSEL3
DCO frequency range 3
DCORSEL = 3
DCO internal or external resistor
mode
3.0 V, 25
℃
7.84
18.04
MHz
f
RSEL4
DCO frequency range 4
DCORSEL = 4
DCO internal or external resistor
mode
3.0 V, 25
℃
15.68
36.07
MHz
f
RSEL5
DCO frequency range 5
DCORSEL = 5
DCO internal or external resistor
mode
3.0 V, 25
℃
31.36
52
MHz
f
DCO_DC
Duty cycle
47%
50%
53%