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ADS1244IDGSR Datasheet(PDF) 3 Page - Texas Instruments |
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ADS1244IDGSR Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 25 page  ADS1244 3 SBAS273 www.ti.com ELECTRICAL CHARACTERISTICS All specifications –40 °C to +85°C, AVDD = 5V, DVDD = +3V, f CLK = 2.4576MHz, and VREF = 2.5V, unless otherwise specified. ADS1244 PARAMETER CONDITIONS MIN TYP MAX UNITS ANALOG INPUT Full-Scale Input Voltage Range AINP – AINN ±2V REF V Absolute Input Range AINP, AINN with Respect to GND GND – 0.1 AVDD + 0.1 V Differential Input Impedance fCLK = 2.4576MHz 5 M Ω SYSTEM PERFORMANCE Resolution No Missing Codes 24 Bits Data Rate fCLK = 2.4576MHz 15 sps(1) Integral Nonlinearity (INL) Differential Input Signal, End Point Fit ±0.0002 ±0.0008 % FSR(2) Offset Error 1 10 ppm of FSR Offset Error Drift(3) 0.01 ppm of FSR/ °C Gain Error 0.005 0.02 % Gain Error Drift(3) 0.5 ppm/ °C Common-Mode Rejection at DC 90 130 dB fCM(4) = 50 ± 1Hz, fCLK = 2.4576MHz 100 dB fCM = 60 ± 1Hz, fCLK = 2.4576MHz 100 dB Normal-Mode Rejection fSIG(5) = 50 ± 1Hz, fCLK = 2.4576MHz 60 dB fSIG = 60 ± 1Hz, fCLK = 2.4576MHz 70 dB Input Referred Noise 1 ppm of FSR, rms Analog Power-Supply Rejection at DC, ∆AVDD = 5% 105 dB Digital Power-Supply Rejection at DC, ∆DVDD = 5% 100 dB VOLTAGE REFERENCE INPUT Reference Input Voltage (VREF)VREF ≡ VREFP – VREFN 0.5 2.5 AVDD(6) V Negative Reference Input (VREFN) GND – 0.1 VREFP – 0.5 V Positive Reference Input (VREFP) VREFN + 0.5 AVDD + 0.1 V Voltage Reference Impedance fCLK = 2.4576MHz 1 M Ω DIGITAL INPUT/OUTPUT Logic Levels VIH (CLK, SCLK) 2.1 5.25 V VIL (CLK, SCLK) GND 0.9 V VOH (DRDY/DOUT )IOH = 1mA 2.6 V VOL (DRDY/DOUT )IOL = 1mA 0.4 V Input Leakage (CLK, SCLK) 0 < (CLK, SCLK) < DVDD ±10 µA CLK Frequency (fCLK) 6MHz CLK Duty Cycle 30 70 % POWER SUPPLY AVDD 2.5 5.25 V DVDD 1.8 3.6 V AVDD Current Sleep Mode 0.1 1 µA AVDD = 3V 85 µA AVDD = 5V 90 150 µA DVDD Current Sleep Mode, CLK Stopped 0.1 µA Sleep Mode, 2.4576MHz CLK Running 1.3 5 µA DVDD = 3V 4.5 10 µA Total Power Dissipation AVDD = DVDD = 3V 270 µW NOTES: (1) sps = Samples Per Second. (2) FSR = Full-Scale Range = 4VREF. (3) Recalibration can reduce these errors to the level of the noise. (4) fCM is the frequency of the common-mode input. (5) fSIG is the frequency of the input signal. (6) It will not be possible to reach the digital output full-scale code when VREF > AVDD/2. |
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