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ADS1278 Arkusz danych(PDF) 3 Page - Texas Instruments |
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ADS1278 Arkusz danych(HTML) 3 Page - Texas Instruments |
3 / 52 page ADS1274 ADS1278 www.ti.com SBAS367F – JUNE 2007 – REVISED FEBRUARY 2011 ELECTRICAL CHARACTERISTICS All specifications at TA = –40°C to +105°C, AVDD = +5V, DVDD = +1.8V, IOVDD = +3.3V, fCLK = 27MHz, VREFP = 2.5V, VREFN = 0V, and all channels active, unless otherwise noted. ADS1274, ADS1278 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ANALOG INPUTS Full-scale input voltage (FSR(1)) VIN = (AINP – AINN) ±VREF V Absolute input voltage AINP or AINN to AGND AGND – 0.1 AVDD + 0.1 V Common-mode input voltage (VCM) VCM = (AINP + AINN)/2 2.5 V High-Speed mode 14 k Ω High-Resolution mode 14 k Ω Differential input impedance Low-Power mode 28 k Ω Low-Speed mode 140 k Ω DC PERFORMANCE Resolution No missing codes 24 Bits fCLK = 37MHz 144,531 SPS(3) High-Speed mode(2) fCLK = 32.768MHz 128,000 SPS fCLK = 27MHz 105,469 SPS Data rate (fDATA) High-Resolution mode 52,734 SPS Low-Power mode 52,734 SPS Low-Speed mode 10,547 SPS Integral nonlinearity (INL)(4) Differential input, VCM = 2.5V ±0.0003 ±0.0012 % FSR(1) Offset error 0.25 2 mV Offset drift 0.8 μV/°C Gain error 0.1 0.5 % FSR Gain drift 1.3 ppm/ °C High-Speed mode Shorted input 8.5 16 μV, rms High-Resolution mode Shorted input 5.5 12 μV, rms Noise Low-Power mode Shorted input 8.5 16 μV, rms Low-Speed mode Shorted input 8.0 16 μV, rms Common-mode rejection fCM = 60Hz 90 108 dB AVDD 80 dB Power-supply rejection DVDD fPS = 60Hz 85 dB IOVDD 105 dB VCOM output voltage No load AVDD/2 V (1) FSR = full-scale range = 2VREF. (2) fCLK = 37MHz max for High-Speed mode, and 27MHz max for all other modes. See Table 7 for fCLK restrictions in High-Speed mode. (3) SPS = samples per second. (4) Best fit method. © 2007–2011, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): ADS1274 ADS1278 |
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