52
SLAS826F – MARCH 2015 – REVISED MARCH 2017
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Specifications
Copyright © 2015–2017, Texas Instruments Incorporated
Table 5-11. DCO (continued)
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
(4)
The maximum parasitic capacitance at the DCO external resistance pin (DCOR) should not exceed 5 pF to ensure the specified DCO
start-up time.
t
DCO_JITTER
DCO period jitter
DCORSEL = 5, DCOTUNE = 0
50
90
ps
DCORSEL = 4, DCOTUNE = 0
80
120
DCORSEL = 3, DCOTUNE = 0
115
170
DCORSEL = 2, DCOTUNE = 0
160
240
DCORSEL = 1, DCOTUNE = 0
225
340
DCORSEL = 0, DCOTUNE = 0
450
550
T
DCO_STEP
Step size
Step size of the DCO.
0.2%
t
DCO_SETTLE_RANGE
DCO settling from worst
case DCORSELn to
DCORSELm
DCO settled to within 1.5% of
steady state frequency
10
µs
t
DCO_SETTLE_TUNE
DCO settling worst case
DCOTUNEn to
DCOTUNEm within any
DCORSEL setting
DCO settled to within 1.5% of
steady state frequency
10
µs
t
START
DCO start-up time
(4)
DCO settled to within 0.5% of
steady state frequency
5
µs
lists the overall tolerance of the DCO.
Table 5-12. DCO Overall Tolerance
over operating free-air temperature range (unless otherwise noted)
RESISTOR OPTION
TEMPERATURE
CHANGE
TEMPERATURE
DRIFT (%)
VOLTAGE
CHANGE
VOLTAGE DRIFT
(%)
OVERALL DRIFT
(%)
OVERALL
ACCURACY (%)
Internal resistor
–40°C to 85 °C
±3.125
1.62 V to 3.7 V
±0.2
±3.325
±3.825
0°C
0
1.62 V to 3.7 V
±0.2
±0.2
±0.7
–40°C to 85 °C
±3.125
0 V
0
±3.125
±3.625
External resistor
with 25-ppm TCR
–40°C to 85 °C
±0.5
1.62 V to 3.7 V
±0.2
±0.7
±1.2
0°C
0
1.62 V to 3.7 V
±0.2
±0.2
±0.7
–40°C to 85 °C
±0.5
0 V
0
±0.5
±1