Datasheet

ELECTRICAL CHARACTERISTICS
ADS1225
ADS1226
www.ti.com ....................................................................................................................................................... SBAS346C – MAY 2006 – REVISED JANUARY 2009
All specifications at T
A
= – 40 ° C to +105 ° C, AVDD = +5V, DVDD = +3V, and V
REF
= +5V, unless otherwise noted.
ADS1225, ADS1226
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Analog Input
Full-scale input voltage AINP – AINN ± V
REF
V
Buffer off; AINP, AINN with respect to GND GND – 0.1 AVDD + 0.1 V
Absolute input voltage
Buffer on; AINP, AINN with respect to GND GND + 0.05 AVDD – 1.5 V
Buffer off 2 M Ω
Differential input impedance
Buffer on 1 G Ω
Common-mode input impedance Buffer off 4 M Ω
System Performance
Resolution 24 Bits
High-Speed mode 75 100 125 SPS
(1)
Data rate
High-Resolution mode 12 16 22 SPS
(1)
Integral nonlinearity (INL) End-point fit 0.0005 0.0020 % of FSR
(2)
Offset error 60 200 µ V
Offset error drift 0.3 µ V/ ° 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% Δ in AVDD 95 dB
Digital power-supply rejection At dc, DVDD = 2.7V to 5.5V 80 dB
High-Speed mode 1.5 ppm of FSR, rms
Noise
High-Resolution mode 0.4 ppm of FSR, rms
Temperature Sensor
Temperature sensor voltage T
A
= +25 ° C 106 mV
Temperature sensor coefficient 360 µ V/ ° C
Voltage Reference Input
Reference input voltage V
REF
= VREFP – VREFN 0.5 AVDD V
Negative reference input GND – 0.1 VREFP – 0.5 V
Positive reference input VREFN + 0.5 AVDD + 0.1 V
Voltage reference impedance 1.5 M Ω
(1) SPS = samples per second.
(2) FSR = full-scale range = 2 × V
REF
.
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Product Folder Link(s): ADS1225 ADS1226