Datasheet

ADS1131
www.ti.com SBAS449C –JULY 2009–REVISED OCTOBER 2013
ELECTRICAL CHARACTERISTICS
Minimum/maximum limit specifications apply from –40°C to +85°C. Typical specifications at +25°C.
All specifications at AVDD = DVDD = VREFP = +5V, and VREFN = GND, unless otherwise noted.
ADS1131
PARAMETER CONDITIONS MIN TYP MAX UNIT
ANALOG INPUTS
±0.5V
REF
/64 V
Full-scale input voltage (AINP – AINN) V
REF
= AVDD = 5V ±39.0 mV
V
REF
= AVDD = 3V ±23.4 mV
Common-mode input range GND + 1.5V AVDD – 1.5V V
Differential input current ±2 nA
LOW-SIDE POWER SWITCH
AVDD = 5V, I
SW
= 30mA 3.5 5 Ω
On-resistance (R
ON
)
AVDD = 3V, I
SW
= 30mA 4 7 Ω
Current through switch 30 mA
SYSTEM PERFORMANCE
Resolution No missing codes 18 Bits
SPEED = high 80 SPS
Data rate
SPEED = low 10 SPS
Digital filter settling time Full settling 4 Conversions
Integral nonlinearity (INL) Differential input, end-point fit ±8 ppm
Input offset error 10 μV
Input offset drift ±15 nV/°C
Gain error 1 %
Gain drift ±4 ppm/°C
Normal-mode rejection f
IN
= 50Hz or 60Hz ±1Hz, f
DATA
= 10SPS 90 dB
Common-mode rejection At dc 110 dB
f
DATA
= 10SPS, AVDD = V
REF
= 5V 1 LSB
f
DATA
= 80SPS, AVDD = V
REF
= 5V 1.7 LSB
Noise (peak-to-peak)
f
DATA
= 10SPS, AVDD = V
REF
= 5V 300 nV
f
DATA
= 80SPS, AVDD = V
REF
= 5V 500 nV
Power-supply rejection At dc 100 dB
VOLTAGE REFERENCE INPUT
Voltage reference input (V
REF
) V
REF
= VREFP – VREFN 1.5 AVDD AVDD + 0.1V V
Negative reference input (VREFN) AGND – 0.1 VREFP – 1.5 V
Positive reference input (VREFP) VREFN + 1.5 AVDD + 0.1 V
Voltage reference input current 10 nA
DIGITAL INPUT/OUTPUT (DVDD = 2.7V to 5.3V)
V
IH
0.8 DVDD DVDD + 0.1 V
V
IL
GND 0.2 DVDD V
Logic levels
V
OH
I
OH
= 500μA DVDD – 0.4 V
V
OL
I
OL
= 500μA 0.2 DVDD V
Input leakage 0 < V
DIGITAL INPUT
< DVDD ±10 μA
Serial clock input frequency (f
SCLK
) 5 MHz
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