ADS1118_13 Datasheet, PDF (3/38 Pages) Texas Instruments – Ultra-Small, Low-Power, SPI™-Compatible, 16-Bit Analog-to-Digital Converter and Temperature Sensor with Internal Reference

ADS1118
www.ti.com
SBAS457C – OCTOBER 2010 – REVISED FEBRUARY 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⁾
Analog input voltage
Differential input impedance
Common-mode input impedance
V_IN = (AIN_P) – (AIN_N)
AIN_P or AIN_N to GND
FS = ±6.144 V⁽¹⁾
FS = ±4.096 V⁽¹⁾, ±2.048 V
FS = ±1.024 V
See Table 2
GND
See Table 1
8
6
3
VDD
V
MΩ
MΩ
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
Integral nonlinearity
DR = 8 SPS, FS = ±2.048 V⁽²⁾
See Typical Characteristics
1
LSB
Offset error
FS = ±2.048 V, differential inputs
FS = ±2.048 V, single-ended inputs
±0.1
±0.25
±2
LSB
LSB
Offset drift
FS = ±2.048 V
0.002
LSB/°C
Offset power-supply rejection
Gain error⁽³⁾
Gain drift⁽³⁾⁽⁴⁾
FS = ±2.048 V, with dc supply variation
FS = ±2.048 V at T_A = +25°C
FS = ±0.256 V
FS = ±2.048 V
FS = ±6.144 V⁽¹⁾
0.2
LSB/V
0.01
0.15
%
7
ppm/°C
5
40 ppm/°C
5
ppm/°C
Gain power-supply rejection
PGA gain match⁽³⁾
Match between any two PGA gains
10
ppm/V
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
Common-mode rejection
At dc and FS = ±2.048 V
At dc and FS = ±6.144 V⁽¹⁾
100
dB
90
dB
TEMPERATURE SENSOR
f_CM = 50 Hz, DR = 860 SPS
f_CM = 60 Hz, DR = 860 SPS
105
dB
105
dB
Temperature sensor range
–40
+125
°C
Temperature sensor resolution
0.03125
°C/LSB
Temperature sensor accuracy
T_A = 0°C to +70°C
T_A = –40°C to +125°C
vs supply
0.2
0.4
0.03125
±0.5
±1
±0.25
°C
°C
°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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