CC2640R2L
ZHCSRK4A –APRIL 2020 –REVISED SEPTEMBER 2020
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8.16 48-MHz RC Oscillator (RCOSC_HF)
Measured on the TI CC2650EM-5XD reference design with Tc = 25°C, VDDS = 3.0 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Frequency
48
MHz
Uncalibrated frequency accuracy
Calibrated frequency accuracy(1)
Start-up time
±1%
±0.25%
5
µs
(1) Accuracy relative to the calibration source (XOSC_HF).
8.17 32-kHz RC Oscillator (RCOSC_LF)
Measured on the TI CC2650EM-5XD reference design with Tc = 25°C, VDDS = 3.0 V, unless otherwise noted.
PARAMETER
Calibrated frequency(1)
Temperature coefficient
TEST CONDITIONS
MIN
TYP
32.8
80
MAX
UNIT
kHz
ppm/°C
(1) The frequency accuracy of the Real Time Clock (RTC) is not directly dependent on the frequency accuracy of the 32-kHz RC
Oscillator. The RTC can be calibrated to an accuracy within ±500 ppm of 32.768 kHz by measuring the frequency error of RCOSC_LF
relative to XOSC_HF and compensating the RTC tick speed. The procedure is explained in Running Bluetooth® Low Energy on
CC2640 Without 32 kHz Crystal.
8.18 ADC Characteristics
Tc = 25°C, VDDS = 3.0 V and voltage scaling enabled, unless otherwise noted.(1)
PARAMETER
Input voltage range
Resolution
TEST CONDITIONS
MIN
TYP
MAX UNIT
0
VDDS
V
12
Bits
ksps
LSB
LSB
LSB
LSB
Sample rate
200
Offset
Internal 4.3-V equivalent reference(2)
Internal 4.3-V equivalent reference(2)
2
2.4
Gain error
DNL(3) Differential nonlinearity
>–1
±3
INL(4)
Integral nonlinearity
Internal 4.3-V equivalent reference(2), 200 ksps,
9.6-kHz input tone
9.8
10
ENOB Effective number of bits
VDDS as reference, 200 ksps, 9.6-kHz input tone
Bits
dB
dB
dB
Internal 1.44-V reference, voltage scaling disabled,
32 samples average, 200 ksps, 300-Hz input tone
11.1
Internal 4.3-V equivalent reference(2), 200 ksps,
9.6-kHz input tone
–65
–69
–71
THD
Total harmonic distortion VDDS as reference, 200 ksps, 9.6-kHz input tone
Internal 1.44-V reference, voltage scaling disabled,
32 samples average, 200 ksps, 300-Hz input tone
Internal 4.3-V equivalent reference(2), 200 ksps,
9.6-kHz input tone
60
63
69
Signal-to-noise
and
Distortion ratio
SINAD,
SNDR
VDDS as reference, 200 ksps, 9.6-kHz input tone
Internal 1.44-V reference, voltage scaling disabled,
32 samples average, 200 ksps, 300-Hz input tone
Internal 4.3-V equivalent reference(2), 200 ksps,
9.6-kHz input tone
67
68
73
Spurious-free dynamic
range
SFDR
VDDS as reference, 200 ksps, 9.6-kHz input tone
Internal 1.44-V reference, voltage scaling disabled,
32 samples average, 200 ksps, 300-Hz input tone
clock-
cycles
Conversion time
Serial conversion, time-to-output, 24-MHz clock
50
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