Datasheet

ADS1118
www.ti.com SBAS457D –OCTOBER 2010–REVISED OCTOBER 2013
ELECTRICAL CHARACTERISTICS
Maximum and minimum specifications are at 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, data rate = 8 SPS, and full-scale (FS) = ±2.048 V, unless otherwise noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ANALOG INPUT
Full-scale input voltage range
(1)
V
IN
= (AIN
P
) – (AIN
N
) See Table 2
Analog input voltage AIN
P
or AIN
N
to GND GND VDD V
Differential input impedance See Table 1
FS = ±6.144 V
(1)
8 MΩ
FS = ±4.096 V
(1)
, ±2.048 V 6 MΩ
Common-mode input impedance
FS = ±1.024 V 3 MΩ
FS = ±0.512V, ±0.256 V 100 MΩ
SYSTEM PERFORMANCE
Resolution No missing codes 16 Bits
Data rate (DR) 8, 16, 32, 64, 128, 250, 475, 860 SPS
Data rate variation All data rates –10 10 %
Output noise See Typical Characteristics
Integral nonlinearity DR = 8 SPS, FS = ±2.048 V
(2)
1 LSB
FS = ±2.048 V, differential inputs ±0.1 ±2 LSB
Offset error
FS = ±2.048 V, single-ended inputs ±0.25 LSB
Offset drift FS = ±2.048 V 0.002 LSB/°C
Offset power-supply rejection FS = ±2.048 V, with dc supply variation 0.2 LSB/V
Gain error
(3)
FS = ±2.048 V at T
A
= +25°C 0.01 0.15 %
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
Gain power-supply rejection 10 ppm/V
PGA gain match
(3)
Match between any two PGA gains 0.01 0.1 %
Gain match Match between any two inputs 0.01 0.1 %
Offset match Match between any two inputs 0.6 LSB
At dc and FS = ±0.256 V 105 dB
At dc and FS = ±2.048 V 100 dB
Common-mode rejection At dc and FS = ±6.144 V
(1)
90 dB
f
CM
= 50 Hz, DR = 860 SPS 105 dB
f
CM
= 60 Hz, DR = 860 SPS 105 dB
TEMPERATURE SENSOR
Temperature sensor range –40 +125 °C
Temperature sensor resolution 0.03125 °C/LSB
T
A
= 0°C to +70°C 0.2 ±0.5 °C
Temperature sensor accuracy T
A
= –40°C to +125°C 0.4 ±1 °C
vs supply 0.03125 ±0.25 °C/V
(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 onboard PGA and reference.
(4) Not production tested; ensured by characterization.
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