Datasheet
ADS1018
www.ti.com
SBAS526B –NOVEMBER 2012–REVISED OCTOBER 2013
ELECTRICAL CHARACTERISTICS
Maximum and minimum specifications apply from T
A
= –40°C to +125°C, unless otherwise noted.
Typical values are at T
A
= +25°C. All specifications are at VDD = 3.3 V and full-scale (FS) = ±2.048 V, unless otherwise
noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ANALOG INPUT
Full-scale input voltage range V
IN
= (AIN
P
) – (AIN
N
) See Table 2 V
Analog input voltage AIN
P
or AIN
N
to GND GND VDD V
Z
ID
Differential input impedance See Table 1
FS = ±6.144 V
(1)
8 MΩ
FS = ±4.096 V
(1)
, ±2.048 V 6 MΩ
Z
IC
Common-mode input impedance
FS = ±1.024 V 3 MΩ
FS = ±0.512 V, ±0.256 V 100 MΩ
SYSTEM PERFORMANCE
Resolution No missing codes 12 Bits
DR Data rate 128, 250, 490, 920, 1600, 2400, 3300 SPS
Data rate variation All data rates –10% 10%
Output noise See Typical Characteristics
INL Integral nonlinearity DR = 128 SPS, FS = ±2.048 V
(2)
0.5 LSB
FS = ±2.048 V, differential inputs 0 ±0.5 LSB
E
O
Offset error
FS = ±2.048 V, single-ended inputs ±0.25 LSB
Offset drift FS = ±2.048 V 0.002 LSB/°C
E
G
Gain error
(3)
FS = ±2.048 V at T
A
= +25°C 0.05% 0.25%
FS = ±0.256 V 7 ppm/°C
Gain drift
(3)(4)
FS = ±2.048 V 5 40 ppm/°C
FS = ±6.144 V
(1)
5 ppm/°C
PGA gain match
(3)
Match between any two PGA gains 0.02% 0.1%
Gain match Match between any two inputs 0.05% 0.1%
Offset match Match between any two inputs 0.25 LSB
TEMPERATURE SENSOR
Temperature sensor range –40 +125 °C
Temperature sensor resolution 0.125 °C/LSB
T
A
= 0°C to +70°C 0.25 ±1 °C
Temperature sensor accuracy T
A
= –40°C to +125°C 0.5 ±2 °C
vs supply 0.125 ±1 °C/V
DIGITAL INPUT/OUTPUT
V
IH
Logic input level, high 0.7 VDD VDD V
V
IL
Logic input level, low GND 0.2 VDD V
V
OH
Logic output level, high I
OH
= 1 mA 0.8 VDD V
V
OL
Logic output level, low I
OL
= 1 mA GND 0.2 VDD V
I
H
Input leakage, high V
IH
= 5.5 V ±10 μA
I
L
Input leakage, low V
IL
= GND ±10 μA
(1) This parameter expresses the full-scale range of the ADC scaling. In no event should more than VDD + 0.3 V or 5.5 V (whichever is
smaller) be applied to this device.
(2) Best-fit INL; covers 99% of full-scale.
(3) Includes all errors from the onboard PGA and reference.
(4) Not production tested; ensured by characterization.
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