CC2538
www.ti.com
SWRS096A –DECEMBER 2012–REVISED APRIL 2013
ADC CHARACTERISTICS
TA = 25°C and VDD = 3 V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
VDD is voltage on AVDD5 pin
MIN
0
TYP MAX
VDD
UNIT
V
Input voltage
External reference voltage
External reference voltage differential
Input resistance, signal
VDD is voltage on AVDD5 pin
0
VDD
V
VDD is voltage on AVDD5 pin
0
VDD
V
Using 4-MHz clock speed
197
kΩ
V
Full-scale signal(1)
Peak-to-peak, defines 0 dBFS
2.97
5.7
Single-ended input, 7-bit setting
Single-ended input, 9-bit setting
Single-ended input, 10-bit setting
Single-ended input, 12-bit setting
Differential input, 7-bit setting
7.5
9.3
10.8
6.5
ENOB(1)
Effective number of bits
Bits
Differential input, 9-bit setting
8.3
Differential input, 10-bit setting
Differential input, 12-bit setting
7-bit setting, both single and differential
Single-ended input, 12-bit setting, –6 dBFS
Differential input, 12-bit setting, –6 dBFS
Single-ended input, 12-bit setting
Differential input, 12-bit setting
Single-ended input, 12-bit setting, –6 dBFS
Differential input, 12-bit setting, –6 dBFS
10.0
11.5
0–20
–75.2
–86.6
70.2
79.3
78.8
88.9
Useful power bandwidth
Total harmonic distortion
kHz
dB
THD(1)
Signal to nonharmonic ratio(1)
dB
dB
Differential input, 12-bit setting, 1-kHz sine (0
dBFS), limited by ADC resolution
CMRR
Common-mode rejection ratio
Crosstalk
>84
Single-ended input, 12-bit setting, 1-kHz sine
(0 dBFS), limited by ADC resolution
< – 84
dB
Offset
Midscale
–3
0.68%
0.05
0.9
mV
Gain error
12-bit setting, mean
DNL(1)
INL(1)
Differential nonlinearity
Integral nonlinearity
LSB
LSB
12-bit setting, maximum
12-bit setting, mean
4.6
12-bit setting, maximum
Single-ended input, 7-bit setting
Single-ended input, 9-bit setting
Single-ended input, 10-bit setting
Single-ended input, 12-bit setting
Differential input, 7-bit setting
Differential input, 9-bit setting
Differential input, 10-bit setting
Differential input, 12-bit setting
7-bit setting
13.3
35.4
46.8
57.5
66.6
40.7
51.6
61.8
70.8
20
SINAD(1)
(–THD+N)
Signal-to-noise-and-distortion
dB
9-bit setting
36
Conversion time
μs
10-bit setting
68
12-bit setting
132
1.2
Current consumption
mA
V
Internal reference voltage
1.19
2
Internal reference VDD coefficient
Internal reference temperature coefficient
mV/V
mV/10°C
0.4
(1) Measured with 300-Hz sine-wave input and VDD as reference
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