Datasheet

ADS131E04
ADS131E06
ADS131E08
www.ti.com SBAS561A –JUNE 2012–REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS
Minimum and maximum specifications apply from –40°C to +105°C. Typical specifications are at +25°C. All specifications are
at DVDD = 1.8 V, AVDD = 3 V, AVSS = 0 V, V
REF
= 2.4 V, external f
CLK
= 2.048 MHz, data rate = 8 kSPS, and gain = 1,
unless otherwise noted.
ADS131E0x
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ANALOG INPUTS
Full-scale differential input voltage
±V
REF
/ gain V
(AINP – AINN)
See the Input Common-Mode
Input common-mode range Range subsection of the PGA
Settings and Input Range section
C
i
Input capacitance 20 pF
I
IB
Input bias current PGA output in normal range 5 nA
DC input impedance 200 MΩ
PGA PERFORMANCE
Gain settings 1, 2, 4, 8, 12
See
BW Bandwidth
Table 3
ADC PERFORMANCE
Data rates up to 16 kSPS 24 Bits
Resolution
32- and 64-kSPS data rate 16 Bits
DR Data rate f
CLK
= 2.048 MHz 1 64 kSPS
CHANNEL PERFORMANCE (DC Performance)
INL Integral nonlinearity Full-scale, best fit 10 ppm
G = 1 105 dB
Dynamic range
Gain settings other than 1 See Noise Measurements section
E
O
Offset error 350 μV
Offset error drift 0.65 μV/°C
E
G
Gain error Excluding voltage reference error 0.1 %
Gain drift Excluding voltage reference drift 3 ppm/°C
Gain match between channels 0.2 % of FS
CHANNEL PERFORMANCE (AC Performance)
CMRR Common-mode rejection ratio f
CM
= 50 Hz and 60 Hz
(1)
–110 dB
PSRR Power-supply rejection ratio f
PS
= 50 Hz and 60 Hz –80 dB
Crosstalk f
IN
= 50 Hz and 60 Hz –110 dB
AVDD = 3V, V
REF
0.04 %
= 2.4V
3000:1 dynamic range with a 1-second
Accuracy
measurement (V
RMS
/ I
RMS
)
AVDD = 5 V, V
REF
0.025 %
= 4V
SNR Signal-to-noise ratio f
IN
= 50 Hz and 60 Hz, gain = 1 107 dB
THD Total harmonic distortion 10 Hz, –0.5 dBFs –93 dB
FAULT DETECT AND ALARM
Comparator threshold accuracy ±30 mV
EXTERNAL REFERENCE
AVDD = 3 V, V
REF
= (VREFP – VREFN) 2 2.5 AVDD V
Reference input voltage
AVDD = 5 V, V
REF
= (VREFP – VREFN) 2 4 AVDD V
VREFN Negative input AVSS V
AVDD – AVSS +
VREFP Positive input AVDD V
2.5 2.5
Input impedance 6 kΩ
(1) CMRR is measured with a common-mode signal of (AVSS + 0.3 V) to (AVDD – 0.3 V). The values indicated are the minimum of the
eight channels.
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