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ADS1258IRTCR Arkusz danych(PDF) 3 Page - Texas Instruments |
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ADS1258IRTCR Arkusz danych(HTML) 3 Page - Texas Instruments |
3 / 47 page www.ti.com ELECTRICAL CHARACTERISTICS ADS1258 SBAS297A – JUNE 2005 – REVISED SEPTEMBER 2005 All specifications at T A = –40°C to +105°C, AVDD = +2.5V, AVSS = –2.5V, DVDD = +3.3V, fCLK = 16MHz (external clock), OPA227 buffer between MUX outputs and ADC inputs, V REF = +4.096V, and VREFN = –2.5V, unless otherwise noted. ADS1258 PARAMETER CONDITIONS MIN TYP MAX UNIT Analog Multiplexer Inputs AIN0–AIN15, Absolute Input Voltage AVSS – 100mV AVDD + 100mV V AINCOM with respect to DGND On-Channel Resistance 80 Ω Crosstalk fIN = 1kHz –110 dB SBCS[1:0] = 01 1.5 Sensor Bias (Current Source) µA SBCS[1:0] = 11 24 1.5 µA:24µA Ratio Error 1 % ADC Input Full-Scale Input Voltage (VIN = ADCINP – ADCINN) ±1.06V REF V Absolute Input Voltage (ADCINP, ADCINN) AVSS – 100mV AVDD + 100mV V Differential Input Impedance 65 k Ω System Performance Resolution No Missing Codes 24 Bits Data Rate, Fixed-Channel Mode 1.953 125 kSPS Data Rate, Auto-Scan Mode 1.805 23.739 kSPS Integral Nonlinearity (INL)(1) Differential Input 0.0003 0.0010 % of FSR(2) Chopping Off 20 Offset Error Shorted Inputs µV Chopping On 1 10 Chopping Off 0.5 Offset Drift(3) Shorted Inputs µV/°C Chopping On 0.02 0.1 Gain Error 0.1 0.5 % Gain Drift(3) 0.4 2 ppm/ °C Noise (see Table 4) Common-Mode Rejection fCM = 60Hz 90 100 dB AVDD, AVSS 70 85 Power-Supply Rejection fPS = 60Hz dB DVDD 80 95 Voltage Reference Input Reference Input Voltage (VREF = VREFP – VREFN) 0.5 4.096 AVDD – AVSS V Negative Reference Input (VREFN) AVSS – 0.1V VREFP – 0.5 V Positive Reference Input (VREFP) VREFN + 0.5 AVDD + 0.1V V Reference Input Impedance 40 k Ω System Parameters External Reference Reading Error 1 3 % Analog Supply Reading Error 1 3 % Temperature Sensor Voltage TA = +25°C 168 mV Reading Coefficient 394 µV/°C Digital Input/Output Logic Levels: VIH 0.7DVDD DVDD V VIL DGND 0.3DVDD V VOH IOH = 2mA 0.8DVDD DVDD V VOL IOL = 2mA DGND 0.2DVDD V Input Leakage VIN = DVDD, GND 10 µA Frequency 0.1 16 MHz Master Clock Input (CLKIO) Duty Cycle 40 60 % (1) Best straight line fit method. (2) FSR = Full-scale range = 2.13VREF. (3) Ensured by characterization. 3 |
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