ADS1246 datasheet(4/66 Pages) TI

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(V )(Gain)

AVSS

0.1V

AVDD

0.1V

(V )(Gain)

ADS1246

ADS1247

ADS1248

SBAS426D – AUGUST 2008 – REVISED MARCH 2010

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ELECTRICAL CHARACTERISTICS

Minimum/maximum specifications apply from –40°C to +105°C. Typical specifications are at +25°C. All specifications at

AVDD = +5V, DVDD = +3.3V, AVSS = 0V, VREF = +2.048V, and oscillator frequency = 4.096MHz, unless otherwise noted.

ADS1246, ADS1247, ADS1248

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG INPUTS

Full-scale input voltage

±VREF/PGA

2.7/PGA

(VIN = ADCINP – ADCINN)

Common-mode input range

Differential input current

100

Absolute input current

See Table 11

PGA gain settings

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

Burnout current source

0.5, 2, or 10

Bias voltage

(AVDD + AVSS)/2

Bias voltage output impedance

400

Ω

SYSTEM PERFORMANCE

Resolution

No missing codes

Bits

Data rate

5, 10, 20, 40, 80, 160, 320, 640, 1000, 2000

SPS

Integral nonlinearity (INL)

Differential input, end point fit, PGA = 1

ppm

Offset error

After calibration(1)

–15

Offset drift

See Figure 11 to Figure 14

nV/°C

T = +25°C, all PGAs,

Gain error

–0.02

±0.005

0.02

data rate = 40, 80, or 160SPS

Gain drift

See Figure 19 to Figure 22

ppm/°C

ADC conversion time

Single-cycle settling

Noise

See Table 5 to Table 8

Normal-mode rejection

See Table 13

At dc, PGA = 1

Common-mode rejection

At dc, PGA = 32

125

AVDD/DVDD at dc, PGA = 32,

Power-supply rejection

100

135

data rate = 80SPS

VOLTAGE REFERENCE INPUT

Voltage reference input

0.5

(AVDD – AVSS) – 1

(VREF = VREFP – VREFN)

Negative reference input (REFN)

AVSS – 0.1

REFP – 0.5

Positive reference input (REFP)

REFN + 0.5

AVDD + 0.1

Reference input current

ON-CHIP VOLTAGE REFERENCE

Output voltage

2.038

2.048

2.058

Output current(2)

±10

Load regulation

mV/mA

TA = +25°C to +105°C

ppm/°C

Drift(3)

TA = –40°C to +105°C

ppm/°C

Startup time

See Table 14

(1)

Offset calibration on the order of noise.

(2)

Do not exceed this loading on the internal voltage reference.

(3)

Specified by the combination of design and final production test.

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