ADS1292 datasheet(5/69 Pages) TI

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ADS1291

ADS1292

ADS1292R

www.ti.com

SBAS502A – DECEMBER 2011 – REVISED MARCH 2012

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.

ADS1291, ADS1292, ADS1292R

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INTERNAL REFERENCE

2.42

Output voltage

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

Settled to 0.2% with 10-µF capacitor on

Start-up time

100

VREFP pin

Quiescent current consumption

µA

SYSTEM MONITORS

Analog supply reading error

Digital supply reading error

From power-supply ramp after power-on

reset (POR) to DRDY low

Device wake up

From power-down mode to DRDY low

From STANDBY mode to DRDY low

VCAP1 settling time

1% accuracy

0.5

Voltage

TA = +25°C

145

Temperature sensor

reading

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

TA = +25°C

±0.5

Internal clock accuracy

–40°C

≤ TA ≤ +85°C

±1.5

Internal oscillator start-up time

μs

Internal oscillator power consumption

μW

CLKSEL pin = 0, CLK_DIV = 0

485

512

562.5

kHz

External clock input frequency

CLKSEL pin = 0, CLK_DIV = 1

1.94

2.048

2.25

MHz

DIGITAL INPUT/OUTPUT

DVDD = 1.8 V to

VIH

0.8 DVDD

DVDD + 0.1

3.6 V

DVDD = 1.8 V to

VIL

–0.1

0.2 DVDD

3.6 V

DVDD = 1.7 V to

VIH

DVDD – 0.2

1.8 V

Logic level

DVDD = 1.7 V to

VIL

0.2

1.8 V

DVDD = 1.7 V to

VOH

IOH = –500 μA

0.9 DVDD

3.6 V

DVDD = 1.7 V to

VOL

IOL = +500 μA

0.1 DVDD

3.6 V

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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