ADS1225 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADS1225

24-Bit Analog-to-Digital Converter with One- and Two-Channel Differential Inputs and Internal Oscillator

Analog Devices 

ADS1225

ADS1226

www.ti.com

SBAS346 – MAY 2006

ELECTRICAL CHARACTERISTICS

All specifications at TA = –40°C to +105°C, AVDD = +5V, DVDD = +3V, and VREF = +5V, unless otherwise noted.

ADS1225, ADS1226

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Analog Input

Full-scale input voltage

Absolute input voltage

AINP – AINN

±VREF

V

Buffer off; AINP, AINN with respect to GND

GND – 0.1

AVDD + 0.1

V

Buffer on; AINP, AINN with respect to GND GND + 0.05

AVDD – 1.5

V

Differential input impedance

Buffer off

Buffer on

2

MΩ

1

GΩ

Common-mode input impedance

Buffer off

4

MΩ

System Performance

Resolution

24

Bits

Data rate

High-Speed mode

High-Resolution mode

75

100

125

SPS (1)

12

16

22

SPS (1)

Integral nonlinearity (INL)

End-point fit

0.0005

0.0020

% of FSR(2)

Offset error

60

200

µV

Offset error drift

0.3

µV/°C

Gain error

0.004

0.025

%

Gain error drift

0.3

ppm/°C

Common-mode rejection

At DC

85

95

dB

Analog power-supply rejection

At DC, ± 10% ∆ in AVDD

95

dB

Digital power-supply rejection

At DC, DVDD = 2.7V to 5.5V

80

dB

Noise

High-Speed mode

High-Resolution mode

1.5

ppm of FSR,

rms

0.4

ppm of FSR,

rms

Temperature Sensor

Temperature sensor voltage

Temperature sensor coefficient

TA = +25°C

106

mV

360

µV/°C

Voltage Reference Input

Reference input voltage

Negative reference input

VREF = VREFP – VREFN

0.5

5

AVDD

V

GND - 0.1

VREFP – 0.5

V

Positive reference input

VREFN + 0.5

AVDD + 0.1

V

Voltage reference impedance

1.5

MΩ

(1) SPS = samples per second.

(2) FSR = full-scale range = 2 × VREF.

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