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ADS131E08SPAGR Arkusz danych(PDF) 7 Page - Texas Instruments |
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ADS131E08SPAGR Arkusz danych(HTML) 7 Page - Texas Instruments |
7 / 67 page 7 ADS131E08S www.ti.com SBAS705A – JUNE 2015 – REVISED JANUARY 2016 Product Folder Links: ADS131E08S Submit Documentation Feedback Copyright © 2015–2016, Texas Instruments Incorporated (1) Minimum and maximum values are specified by design and characterization data. (2) CMRR is measured with a common-mode signal of (AVSS + 0.3 V) to (AVDD – 0.3 V). The values indicated are the minimum of the eight channels. 7.5 Electrical Characteristics Minimum and maximum specifications apply from TA = –40°C to +105°C. Typical specifications are at TA = 25°C. All specifications are at DVDD = 1.8 V, AVDD = 5 V, AVSS = 0 V, VREF = 4.0 V, external fCLK = 2.048 MHz, data rate = 4 kSPS, and gain = 1 (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ANALOG INPUTS Ci Input capacitance 20 pF IIB Input bias current PGA output in normal range 5 nA DC input impedance 200 M Ω PGA PERFORMANCE Gain settings 1, 2, 4, 8, 12 V/V BW Bandwidth See Table 3 ADC PERFORMANCE DR Data rate fCLK = 2.048 MHz 1 4 64 kSPS Resolution DR = 1 kSPS, 2 kSPS, 4 kSPS, 8 kSPS, and 16 kSPS 24 Bits DR = 32 kSPS and 64 kSPS 16 CHANNEL PERFORMANCE (DC Performance) INL Integral nonlinearity Full-scale, best fit 10 ppm Dynamic range Data rate = 4 kSPS, gain = 1 116 dB Gain settings other than 1 See the Noise Measurements section EO Offset error(1) Gain = 1 –100 –450 –800 µV Offset error drift(1) 0.2 2.5 µV/°C EG Gain error Excluding voltage reference error 0.1% Gain drift Excluding voltage reference drift 3 ppm/°C Gain match between channels 0.2 % of FS CHANNEL PERFORMANCE (AC Performance) CMRR Common-mode rejection ratio fCM = 50 Hz or 60 Hz (2) –110 dB PSRR Power-supply rejection ratio fPS = 50 Hz or 60 Hz –80 dB Crosstalk fIN = 50 Hz or 60 Hz –125 –113 dB SNR Signal-to-noise ratio fIN = 50 Hz or 60 Hz, amplitude = –0.5 dBFS, normalized 108 dB fIN = 50 Hz or 60 Hz, amplitude = –15 dBFS, normalized 115 THD Total harmonic distortion fIN = 50 Hz or 60 Hz, amplitude = –0.5 dBFS –102 dBc fIN = 50 Hz or 60 Hz, amplitude = –15 dBFS –107 INTERNAL VOLTAGE REFERENCE VREF Output voltage(1) TA = 25°C, VREF = 2.4 V, VREF_4V = 0 2.4 V TA = 25°C, VREF = 4 V, VREF_4V = 1 3.88 4 4.12 Accuracy TA = 25°C ±0.2% Temperature drift TA = –40°C ≤ TA ≤ 105°C 8 ppm/°C Power-up time VCAP1 = 470 pF, VREFP = 330 nF, settled to 0.2% 1 ms INTERNAL OSCILLATOR Internal oscillator clock frequency 2.048 MHz Internal oscillator accuracy(1) TA = 25°C ±1% –40°C ≤ TA ≤ +105°C ±3% Power-up time 20 µs Internal oscillator power consumption 120 µW |
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