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ADS1271IPW Datasheet(PDF) 3 Page - Burr-Brown (TI) |
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ADS1271IPW Datasheet(HTML) 3 Page - Burr-Brown (TI) |
3 / 29 page ADS1271 SBAS306A − NOVEMBER 2004 − REVISED DECEMBER 2004 www.ti.com 3 ELECTRICAL CHARACTERISTICS All specifications at TA = −40°C to +105°C, AVDD = +5V, DVDD = +1.8V, fCLK = 27MHz, and VREF = +2.5V, unless otherwise noted. ADS1271 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS 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 = (AINP + AINN)/2 2.5 V Differential input High-Speed mode 16.4 k Ω Differential input impedance High-Resolution mode 16.4 k Ω impedance Low-Power mode 32.8 k Ω DC Performance Resolution No missing codes 24 Bits High-Speed mode 105,469 SPS Data rate (fDATA) High-Resolution mode 52,734 SPS Data rate (fDATA) Low-Power mode 52,734 SPS Integral nonlinearity (INL) Differential input, VCM = 2.5V ± 0.0006 ± 0.0015 % of FSR(1) Offset error High-Speed mode Without calibration 0.150 1 mV Offset error With calibration On the level of the noise Offset drift 1.8 µV/_C Gain error 0.1 0.5 % Gain error drift 2 ppm/ °C High-Speed mode Shorted input 9.0 20 µV, rms Noise High-Resolution mode 6.5 µV, rms Noise Low-Power mode 9.0 µV, rms Common-mode rejection fCM = 60Hz 90 100 dB Power-supply AVDD f = 60Hz 80 dB Power-supply rejection DVDD f = 60Hz 80 dB AC Performance Signal-to-noise ratio High-Speed mode 99 106 dB Signal-to-noise ratio (SNR) (2) (unweighted) High-Resolution mode 109 dB (SNR) (2) (unweighted) Low-Power mode 106 dB Total harmonic distortion (THD) (3) VIN = 1kHz, −0.5dBFS −105 −95 dB Spurious free dynamic range −108 dB Passband ripple ±0.005 dB Passband 0.453 fDATA Hz −3dB Bandwidth 0.49 fDATA Hz Stop band attenuation 100 dB High-Speed mode 0.547 fDATA 63.453 fDATA Hz Stop band High-Resolution mode 0.547 fDATA 127.453 fDATA Hz Stop band Low-Power mode 0.547 fDATA 63.453 fDATA Hz Group delay High-Speed and Low-Power modes 38/fDATA s Group delay High-Resolution mode 39/fDATA s Settling time (latency) High-Speed and Low-Power modes Complete settling 76/fDATA s Settling time (latency) High-Resolution mode Complete settling 78/fDATA s (1) FSR = full-scale range = 2VREF. (2) Minimum SNR is ensured by the limit of the DC noise specification. (3) THD includes the first nine harmonics of the input signals. (4) MODE and FORMAT pins excluded. (5) See the text for more details on SCLK. |
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