ADS131M08IPBSR datasheet(8/118 Pages) TI2

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6.5 Electrical Characteristics

minimum and maximum specifications apply from TA = –40°C to +125°C; typical specifications are at TA = 25°C; all

specifications are at AVDD = 3 V, DVDD = 3 V, fCLKIN = 8.192 MHz, data rate = 4 kSPS, gain = 1, all channels enabled,

global-chop mode disabled, using internal reference with 100-nF tied to REFIN pin, and internal oscillator disabled (unless

otherwise noted).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG INPUTS

Zin

Differential input impedance Gain = 1, 2, or 4

330

kΩ

Input bias current

Gain = 8, 16, 32, 64, or 128, inputs shorted

to ground

±1

µA/V

ADC CHARACTERISTICS

Resolution

Bits

Gain settings

1, 2, 4, 8, 16, 32, 64, 128

fDATA

Data rate

High-resolution mode, fCLKIN = 8.192 MHz

250

32k

SPS

Low-power mode, fCLKIN = 4.096 MHz

125

16k

Very low-power mode, fCLKIN = 2.048 MHz

62.5

Startup time

Measured from supplies at 90% to first

DRDY falling edge

0.5

ADC PERFORMANCE

INL

Integral nonlinearity (best fit)

7.5

ppm of

FSR

Offset error (input referred)

±240

µV

Global-chop mode

±32

Offset drift

215

nV/°C

Global-chop mode

105

Gain error

±0.3%

Gain drift

Excluding voltage reference error, gain = 1

ppm/°C

Including internal voltage reference error,

gain = 1

Including internal voltage reference error,

gain = 32

Long-term gain drift

1000 hours at 85°C, including internal

voltage reference error, TQFP package

385

ppm

1000 hours at 85°C, including internal

voltage reference error, WQFN package

CMRR

Common-mode rejection

ratio

At dc

100

fCM = 50 Hz or 60 Hz

PSRR

Power-supply rejection ratio

AVDD at DC

DVDD at DC

100

AVDD supply, fPS = 50 Hz or 60 Hz

DVDD supply, fPS = 50 Hz or 60 Hz

Input referred noise

5.4

µVRMS

During fast startup

1500

Dynamic range

Gain = 1

102

Gain = 64

All other gain settings

See Table 7-1

Crosstalk

fIN = 50 Hz or 60 Hz

–120

ADS131M08

SBAS950B – OCTOBER 2019 – REVISED FEBRUARY 2021

www.ti.com

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