ADS1291IRSMT datasheet(7/83 Pages) TI2

7 / 83 page

ADS1291, ADS1292, ADS1292R

www.ti.com

SBAS502C – DECEMBER 2011 – REVISED APRIL 2020

Product Folder Links: ADS1291 ADS1292 ADS1292R

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(1)

Performance is applicable for 5-V operation as well. Production testing for limits is performed at 3 V.

(2)

CFILTER is the capacitor accross the PGA outputs; see the PGA Settings and Input Range section for details.

(3)

Noise data measured in a 10-second interval. Test not performed in production. Input-referred noise is calculated with input shorted

(without electrode resistance) over a 10-second interval.

(4)

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 two

channels.

6.5 Electrical Characteristics

minimum and maximum specifications apply from –40°C to +85°C; typical specifications are at +25°C; all specifications are at

DVDD = 1.8 V, AVDD – AVSS = 3 V

(1), V

REF = 2.42 V, external fCLK = 512 kHz, data rate = 500 SPS, CFILTER = 4.7 nF

(2), and

gain = 6 (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG INPUTS

Full-scale differential input voltage

(AINP – AINN)

±VREF / gain

Input common-mode range

See the Input Common-Mode Range

subsection of the PGA Settings and Input

Range section

Input capacitance

Input bias current (PGA chop = 8 kHz)

TA = +25°C, input = 1.5 V

±200

TA = –40°C to +85°C, input = 1.5 V

±1

Chop rates other than 8 kHz

See Pace Detect section

DC input impedance

No pull-up or pull-down current source

1000

Ω

Current source lead-off detection (nA),

AVSS + 0.3 V < AIN < AVDD – 0.3 V

500

Ω

Current source lead-off detection (µA),

AVSS + 0.6 V < AIN < AVDD – 0.6 V

100

Ω

PGA PERFORMANCE

Gain settings

1, 2, 3, 4, 6, 8, 12

Bandwidth

With a 4.7-nF capacitor on PGA output

(see PGA Settings and Input Range section

for details)

8.5

kHz

ADC PERFORMANCE

Resolution

Bits

Data rate

fCLK = 512 kHz

125

8000

SPS

CHANNEL PERFORMANCE (DC Performance)

Input-referred noise

Gain = 6(3), 10 seconds of data

μVPP

Gain = 6, 256 points, 0.5 seconds of data

μVPP

Gain settings other than 6,

data rates other than 500 SPS

See Noise Measurements section

Integral nonlinearity

Full-scale with gain = 6, best fit

ppm

Offset error

±100

μV

Offset error drift

μV/°C

Offset error with calibration

μV

Gain error

Excluding voltage reference error

±0.1

±0.2

% of FS

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

(4)

105

120

PSRR

Power-supply rejection ratio

fPS = 50 Hz and 60 Hz

Crosstalk

fIN = 50 Hz and 60 Hz

–120

SNR

Signal-to-noise ratio

fIN = 10 Hz input, gain = 6

107

THD

Total harmonic distortion

10 Hz, –0.5 dBFs, CFILTER = 4.7nF

–104

100 Hz, –0.5 dBFs, CFILTER = 4.7nF

–95

ADS1292R channel 1, 10 Hz, –0.5 dBFS,

CFILTER = 47 nF

–82

ADS1291IRSMT Datasheet(PDF) 7 Page - Texas Instruments

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