Datasheet

21
CC2650
www.ti.com SWRS158B –FEBRUARY 2015–REVISED JULY 2016
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SpecificationsCopyright © 2015–2016, Texas Instruments Incorporated
(1) Accuracy relative to the calibration source (XOSC_HF).
5.16 48-MHz RC Oscillator (RCOSC_HF)
Measured on the TI CC2650EM-5XD reference design with T
c
= 25°C, V
DDS
= 3.0 V, unless otherwise noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Frequency 48 MHz
Uncalibrated frequency accuracy ±1%
Calibrated frequency accuracy
(1)
±0.25%
Start-up time 5 µs
(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.
5.17 32-kHz RC Oscillator (RCOSC_LF)
Measured on the TI CC2650EM-5XD reference design with T
c
= 25°C, V
DDS
= 3.0 V, unless otherwise noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Calibrated frequency
(1)
32.8 kHz
Temperature coefficient 50 ppm/°C
(1) Using IEEE Std 1241™-2010 for terminology and test methods.
(2) Input signal scaled down internally before conversion, as if voltage range was 0 to 4.3 V.
(3) No missing codes. Positive DNL typically varies from +0.3 to +3.5, depending on device (see Figure 5-25).
(4) For a typical example, see Figure 5-26.
5.18 ADC Characteristics
T
c
= 25°C, V
DDS
= 3.0 V and voltage scaling enabled, unless otherwise noted.
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Input voltage range 0 VDDS V
Resolution 12 Bits
Sample rate 200 ksps
Offset Internal 4.3-V equivalent reference
(2)
2 LSB
Gain error Internal 4.3-V equivalent reference
(2)
2.4 LSB
DNL
(3)
Differential nonlinearity >–1 LSB
INL
(4)
Integral nonlinearity ±3 LSB
ENOB Effective number of bits
Internal 4.3-V equivalent reference
(2)
, 200 ksps,
9.6-kHz input tone
9.8
BitsVDDS as reference, 200 ksps, 9.6-kHz input tone 10
Internal 1.44-V reference, voltage scaling disabled,
32 samples average, 200 ksps, 300-Hz input tone
11.1
THD Total harmonic distortion
Internal 4.3-V equivalent reference
(2)
, 200 ksps,
9.6-kHz input tone
–65
dBVDDS as reference, 200 ksps, 9.6-kHz input tone –69
Internal 1.44-V reference, voltage scaling disabled,
32 samples average, 200 ksps, 300-Hz input tone
–71
SINAD,
SNDR
Signal-to-noise
and
Distortion ratio
Internal 4.3-V equivalent reference
(2)
, 200 ksps,
9.6-kHz input tone
60
dBVDDS as reference, 200 ksps, 9.6-kHz input tone 63
Internal 1.44-V reference, voltage scaling disabled,
32 samples average, 200 ksps, 300-Hz input tone
69
SFDR
Spurious-free dynamic
range
Internal 4.3-V equivalent reference
(2)
, 200 ksps,
9.6-kHz input tone
67
dBVDDS as reference, 200 ksps, 9.6-kHz input tone 72
Internal 1.44-V reference, voltage scaling disabled,
32 samples average, 200 ksps, 300-Hz input tone
73