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ADS1299-4PAG Datasheet(PDF) 9 Page - Texas Instruments |
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ADS1299-4PAG Datasheet(HTML) 9 Page - Texas Instruments |
9 / 79 page 9 ADS1299, ADS1299-4, ADS1299-6 www.ti.com SBAS499B – JULY 2012 – REVISED OCTOBER 2016 Product Folder Links: ADS1299 ADS1299-4 ADS1299-6 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated Electrical Characteristics (continued) Minimum and maximum specifications apply from –40°C to 85°C. Typical specifications are at +25°C. All specifications are at DVDD = 3.3 V, AVDD – AVSS = 5 V, VREF = 4.5 V, external fCLK = 2.048 MHz, data rate = 250 SPS, and gain = 12, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT LEAD-OFF DETECT Frequency Continuous At dc, fDR / 4, see Register Maps for settings Hz One time or periodic 7.8, 31.2 Current ILEAD_OFF[1:0] = 00 6 nA ILEAD_OFF[1:0] = 01 24 ILEAD_OFF[1:0] = 10 6 μA ILEAD_OFF[1:0] = 11 24 Current accuracy ±20% Comparator threshold accuracy ±30 mV EXTERNAL REFERENCE Input impedance 5.6 k Ω INTERNAL REFERENCE VREF Internal reference voltage 4.5 V VREF accuracy ±0.2% Drift TA = –40°C to +85°C 35 ppm Start-up time 150 ms SYSTEM MONITORS Reading error Analog supply 2% Digital supply 2% Device wake up From power-up to DRDY low 150 ms STANDBY mode 31.25 µs Temperature sensor reading Voltage TA = +25°C 145 mV Coefficient 490 μV/°C Test signal Signal frequency See Register Maps section for settings fCLK / 2 21, f CLK / 2 20 Hz Signal voltage See Register Maps section for settings ±1, ±2 mV Accuracy ±2% CLOCK Internal oscillator clock frequency Nominal frequency 2.048 MHz Internal clock accuracy TA = +25°C ±0.5% –40°C ≤ TA ≤ +85°C ±2.5% Internal oscillator start-up time 20 μs Internal oscillator power consumption 120 μW DIGITAL INPUT/OUTPUT (DVDD = 1.8 V to 3.6 V) VIH High-level input voltage 0.8 DVDD DVDD + 0.1 V VIL Low-level input voltage –0.1 0.2 DVDD V VOH High-level output voltage IOH = –500 μA 0.9 DVDD V VOL Low-level output voltage IOL = +500 μA 0.1 DVDD V Input current 0 V < VDigitalInput < DVDD –10 10 μA |
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