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ADS1222IPWT Datasheet(PDF) 3 Page - Texas Instruments |
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ADS1222IPWT Datasheet(HTML) 3 Page - Texas Instruments |
3 / 27 page ADS1222 SBAS314B − APRIL 2004 − REVISED JANUARY 2009 www.ti.com 3 ELECTRICAL CHARACTERISTICS All specifications at TA = −40°C to +85°C, VDD = +5V, fCLK = 2MHz, and VREF = +2.5V, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Analog Input Full-scale input voltage AINP − AINN ±2VREF V Absolute input voltage Buffer off; AINP, AINN with respect to GND GND − 0.1 VDD + 0.1 V Absolute input voltage Buffer on; AINP, AINN with respect to GND GND + 0.05 VDD − 1.5 V Differential input impedance Buffer off; fCLK = 2MHz 2.7 M Ω Differential input impedance Buffer on; fCLK = 2MHz 1.2 G Ω Common-mode input impedance Buffer off; fCLK = 2MHz 5.4 M Ω System Performance Resolution No missing codes 24 Bits Data rate 120 (fCLK/2MHz) SPS(1) Integral nonlinearity (INL) Buffer off; Differential input signal, end point fit 0.0003 0.0015 % of FSR(2) Integral nonlinearity (INL) Buffer on; Differential input signal, end point fit 0.0006 % of FSR Offset error Buffer off 50 150 µV Offset error Buffer on 50 µV Offset error drift Buffer off 0.2 µV/°C Offset error drift Buffer on 0.2 µV/°C Offset error match Between channels 20 100 µV Gain error Buffer off 0.004 0.025 % Gain error Buffer on 0.008 % Gain error drift Buffer off 0.00003 % of FSR/ °C Gain error drift Buffer on 0.00006 % of FSR/ °C Gain error match Between channels 0.0005 % Common-mode rejection Buffer off; at DC 95 dB Common-mode rejection Buffer on; at DC 90 100 dB Power-supply rejection Buffer off; at DC, VDD = 2.7V to 5.5V 90 dB Power-supply rejection Buffer on; at DC, VDD = 2.7V to 5.5V 90 dB Noise 0.8 ppm of FSR, rms Temperature Sensor Temperature sensor voltage TA = 25°C 106 mV Temperature sensor coefficient 360 µV/°C Voltage Reference Input Reference input voltage VREF = VREFP − VREFN 0.5 2.5 VDD(3) V Negative reference input Buffer off GND − 0.1 VREFP − 0.5 V Positive reference input Buffer off VREFN + 0.5 VDD + 0.1 V Negative reference input Buffer on GND + 0.05 VREFP − 0.5 V Positive reference input Buffer on VREFN + 0.5 VDD − 1.5 V Voltage reference impedance fCLK = 2MHz 500 k Ω (1) SPS = samples per second. (2) FSR = full-scale range = 4VREF. (3) It will not be possible to reach the digital output full-scale code when VREF > VDD/2. |
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