ADS1291IRSMT datasheet(9/83 Pages) TI2

9 / 83 page

ADS1291, ADS1292, ADS1292R

www.ti.com

SBAS502C – DECEMBER 2011 – REVISED APRIL 2020

Product Folder Links: ADS1291 ADS1292 ADS1292R

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Electrical Characteristics (continued)

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

INTERNAL REFERENCE

Output voltage

2.42

4.033

Output current drive

Available for external use

100

µA

VREF accuracy

±0.5

Internal reference drift

–40°C

≤ TA ≤ +85°C

ppm/°C

Start-up time

Settled to 0.2% with 10-µF capacitor on

VREFP pin

100

Quiescent current consumption

µA

SYSTEM MONITORS

Analog supply reading error

Digital supply reading error

Device wake up

From power-supply ramp after power-on

reset (POR) to DRDY low

From power-down mode to DRDY low

From STANDBY mode to DRDY low

VCAP1 settling time

1% accuracy

0.5

Temperature sensor

reading

Voltage

TA = +25°C

145

Coefficient

490

μV/°C

TEST SIGNAL

Signal frequency

See Register Map section for settings

At dc and 1 Hz

Signal voltage

See Register Map section for settings

±1

Accuracy

±2

CLOCK

Internal oscillator clock frequency

Nominal frequency

512

kHz

Internal clock accuracy

TA = +25°C

±0.5

–40°C

≤ TA ≤ +85°C

±1.5

Internal oscillator start-up time

μs

Internal oscillator power consumption

μW

External clock input frequency

CLKSEL pin = 0, CLK_DIV = 0

485

512

562.5

kHz

CLKSEL pin = 0, CLK_DIV = 1

1.94

2.048

2.25

MHz

DIGITAL INPUT/OUTPUT

VIH

Logic level

DVDD = 1.8 V to

3.6 V

0.8 DVDD

DVDD + 0.1

VIL

DVDD = 1.8 V to

3.6 V

–0.1

0.2 DVDD

VIH

DVDD = 1.7 V to

1.8 V

DVDD – 0.2

VIL

DVDD = 1.7 V to

1.8 V

0.2

VOH

DVDD = 1.7 V to

3.6 V

IOH = –500 μA

0.9 DVDD

VOL

DVDD = 1.7 V to

3.6 V

IOL = +500 μA

0.1 DVDD

IIN

Input current

0 V < VDigitalInput < DVDD

–10

+10

μA

POWER-SUPPLY REQUIREMENTS

AVDD

Analog supply

AVDD – AVSS

2.7

5.25

DVDD

Digital supply

DVDD – DGND

1.7

1.8

3.6

AVDD – DVDD

–2.1

3.6

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