CC2538
SWRS096A –DECEMBER 2012–REVISED APRIL 2013
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16-MHz RC OSCILLATOR
Measured on Texas Instruments CC2538 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
Frequency(1)
TEST CONDITIONS
MIN
TYP
16
MAX
UNIT
MHz
Uncalibrated frequency accuracy
Calibrated frequency accuracy
Start-up time
±18%
±0.6%
±1%
10
μs
μs
Initial calibration time(2)
50
(1) The calibrated 16-MHz RC oscillator frequency is the 32-MHz XTAL frequency divided by 2.
(2) When the 16-MHz RC oscillator is enabled, it is calibrated when a switch from the 16-MHz RC oscillator to the 32-MHz crystal oscillator
is performed while SLEEPCMD.OSC_PD is set to 0.***
RSSI/CCA CHARACTERISTICS
Measured on Texas Instruments CC2538 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
100
±4
MAX
UNIT
dB
RSSI range
Absolute uncalibrated RSSI/CCA accuracy
RSSI/CCA offset(1)
dB
73
dB
Step size (LSB value)
1
dB
(1) Real RSSI = Register value – offset
FREQEST CHARACTERISTICS
Measured on Texas Instruments CC2538 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
±250
±10
15
MAX
UNIT
kHz
kHz
kHz
kHz
FREQEST range
FREQEST accuracy
FREQEST offset(1)
Step size (LSB value)
7.8
(1) Real FREQEST = Register value – offset
FREQUENCY SYNTHESIZER CHARACTERISTICS
Measured on Texas Instruments CC2538 EM reference design with TA = 25°C, VDD = 3 V and fc = 2440 MHz, unless
otherwise noted.
PARAMETER
TEST CONDITIONS
At ±1-MHz offset from carrier
MIN
TYP
–111
–119
–126
MAX
UNIT
Phase noise, unmodulated carrier
At ±2-MHz offset from carrier
At ±5-MHz offset from carrier
dBc/Hz
ANALOG TEMPERATURE SENSOR
Measured on Texas Instruments CC2538 EM reference design with TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
1422
4.2
MAX
UNIT
12-bit ADC
/1°C
Output at 25°C
Temperature coefficient
Voltage coefficient
1
/0.1 V
°C
Measured using integrated ADC, using
internal band-gap voltage reference and
maximum resolution
Initial accuracy without calibration
±10
Accuracy using 1-point calibration (entire
temperature range)
±5
°C
Current consumption when enabled (ADC
current not included)
0.3
mA
10
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