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ADS1240E1K Arkusz danych(PDF) 4 Page - Texas Instruments |
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ADS1240E1K Arkusz danych(HTML) 4 Page - Texas Instruments |
4 / 31 page ADS1240, 1241 4 SBAS173F www.ti.com ELECTRICAL CHARACTERISTICS: AVDD = 3V All specifications –40 °C to +85°C, AV DD = +3V, DVDD = +2.7V to 5.25V, fMOD = 19.2kHz, PGA = 1, Buffer ON, fDATA = 15Hz, and VREF = +1.25V, unless otherwise specified. ADS1240 ADS1241 PARAMETER CONDITIONS MIN TYP MAX UNITS ANALOG INPUT (AIN0 – AIN7, AINCOM) Analog Input Range Buffer OFF AGND – 0.1 AVDD + 0.1 V Buffer ON AGND + 0.05 AVDD – 1.5 V Full-Scale Input Voltage Range (In+) – (In–) See Block Diagram, RANGE = 0 ±V REF /PGA V RANGE = 1 ±V REF /(2 • PGA) V Input Impedance Buffer OFF 5/PGA M Ω Differential Buffer ON 5 G Ω Bandwidth fDATA = 3.75Hz –3dB 1.65 Hz fDATA = 7.50Hz –3dB 3.44 Hz fDATA = 15.00Hz –3dB 14.6 Hz Programmable Gain Amplifier User-Selectable Gain Ranges 1 128 Input Capacitance 9pF Input Leakage Current Modulator OFF, T = 25 °C5 pA Burnout Current Sources 2 µA OFFSET DAC Offset DAC Range RANGE = 0 ±V REF /(2 • PGA) V RANGE = 1 ±V REF /(4 • PGA) V Offset DAC Monotonicity 8 Bits Offset DAC Gain Error ±10 % Offset DAC Gain Error Drift 2 ppm/ °C SYSTEM PERFORMANCE Resolution No Missing Codes 24 Bits Integral Nonlinearity End Point Fit ±0.0015 % of FS Offset Error(1) 15 ppm of FS Offset Drift(1) 0.04 ppm of FS/ °C Gain Error 0.01 % Gain Error Drift(1) 1.0 ppm/ °C Common-Mode Rejection at DC 100 dB fCM = 60Hz, fDATA = 15Hz 130 dB fCM = 50Hz, fDATA = 15Hz 120 dB Normal-Mode Rejection fSIG = 50Hz, fDATA = 15Hz 100 dB fSIG = 60Hz, fDATA = 15Hz 100 dB Output Noise See Typical Characteristics Power-Supply Rejection at DC, dB = –20 log( ∆V OUT /∆VDD) (2) 75 90 dB VOLTAGE REFERENCE INPUT VREF VREF ≡ (REF IN+) – (REF IN–), RANGE = 0 0.1 1.25 1.30 V Reference Input Range REF IN+, REF IN– 0 AVDD V RANGE = 1 0.1 2.5 2.6 V Common-Mode Rejection at DC 120 dB Common-Mode Rejection fVREFCM = 60Hz, fDATA = 15Hz 120 dB Bias Current(3) VREF = 1.25 0.65 µA POWER-SUPPLY REQUIREMENTS Power-Supply Voltage AVDD 2.7 3.3 V Analog Current PDWN = 0, or SLEEP 1 nA PGA = 1, Buffer OFF 107 225 µA PGA = 128, Buffer OFF 355 600 µA PGA = 1, Buffer ON 118 275 µA PGA = 128, Buffer ON 483 1225 µA Digital Current Normal Mode, DVDD = 3V 50 100 µA SLEEP Mode, DVDD = 3V 40 µA Read Data Continuous Mode, DVDD = 3V 113 µA PDWN = 0 0.5 nA Power Dissipation PGA = 1, Buffer OFF, DVDD = 3V 0.6 1.2 mW NOTES: (1) Calibration can minimize these errors to the level of the noise. (2) ∆V OUT is a change in digital result. (3) 12pF switched capacitor at fSAMP clock frequency. |
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