COMBOSMARTMETER datasheet(3/60 Pages) TI1

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ADS131E04

ADS131E06

ADS131E08

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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, VREF = 2.4 V, external fCLK = 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

±VREF / gain

(AINP – AINN)

See the Input Common-Mode

Input common-mode range

Range subsection of the PGA

Settings and Input Range section

Input capacitance

IIB

Input bias current

PGA output in normal range

DC input impedance

200

Ω

PGA PERFORMANCE

Gain settings

1, 2, 4, 8, 12

See

Bandwidth

Table 3

ADC PERFORMANCE

Data rates up to 16 kSPS

Bits

Resolution

32- and 64-kSPS data rate

Bits

Data rate

fCLK = 2.048 MHz

kSPS

CHANNEL PERFORMANCE (DC Performance)

INL

Integral nonlinearity

Full-scale, best fit

ppm

G = 1

105

Dynamic range

Gain settings other than 1

See Noise Measurements section

Offset error

350

μV

Offset error drift

0.65

μV/°C

Gain error

Excluding voltage reference error

0.1

Gain drift

Excluding voltage reference drift

ppm/°C

Gain match between channels

0.2

% of FS

CHANNEL PERFORMANCE (AC Performance)

CMRR

Common-mode rejection ratio

fCM = 50 Hz and 60 Hz

(1)

–110

PSRR

Power-supply rejection ratio

fPS = 50 Hz and 60 Hz

–80

Crosstalk

fIN = 50 Hz and 60 Hz

–110

AVDD = 3V, VREF

0.04

= 2.4V

3000:1 dynamic range with a 1-second

Accuracy

measurement (VRMS / IRMS)

AVDD = 5 V, VREF

0.025

= 4V

SNR

Signal-to-noise ratio

fIN = 50 Hz and 60 Hz, gain = 1

107

THD

Total harmonic distortion

10 Hz, –0.5 dBFs

–93

FAULT DETECT AND ALARM

Comparator threshold accuracy

±30

EXTERNAL REFERENCE

AVDD = 3 V, VREF = (VREFP – VREFN)

2.5

AVDD

Reference input voltage

AVDD = 5 V, VREF = (VREFP – VREFN)

AVDD

VREFN Negative input

AVSS

AVDD –

AVSS +

VREFP

Positive input

AVDD

2.5

Input impedance

Ω

(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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