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ADAS1000 Datasheet(PDF) 6 Page - Analog Devices |
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ADAS1000 Datasheet(HTML) 6 Page - Analog Devices |
6 / 80 page ADAS1000/ADAS1000-1/ADAS1000-2 Data Sheet Rev. A | Page 6 of 80 Parameter Min Typ Max Unit Test Conditions/Comments RIGHT LEG DRIVE/DRIVEN LEAD (ADAS1000/ADAS1000-1 ONLY) Output Voltage Range 0.2 AVDD − 0.2 V RLD_OUT Short Circuit Current −5 ±2 +5 mA External protection resistor required to meet regulatory patient current limits; output shorted to AVDD/AGND Closed-Loop Gain Range2 25 V/V Slew Rate2 200 mV/ms Input Referred Noise1 8 μV p-p 0.05 Hz to 150 Hz Amplifier GBP2 1.5 MHz DC LEAD-OFF Internal current source, pulls up open ECG pins; programmable in 10 nA steps: 10 nA to 70 nA Lead-Off Current Accuracy ±10 % Of programmed value High Threshold Level1 2.4 V Inputs are compared to threshold levels; if inputs exceed levels, lead-off flag is raised Low Threshold Level1 0.2 V Threshold Accuracy 25 mV AC LEAD-OFF Programmable in 4 steps: 12.5 nA rms, 25 nA rms, 50 nA rms, 100 nA rms Frequency Range 2.031 kHz Fixed frequency Lead-Off Current Accuracy ±10 % Of programmed value, measured into low impedance REFIN Input Range2 1.76 1.8 1.84 V Channel gain scales directly with REFIN Input Current 113 μA Per active ADC 450 675 950 μA 5 ECG channels and respiration enabled REFOUT On-chip reference voltage for ADC; not intended to drive other components reference inputs directly, must be buffered externally Output Voltage, VREF 1.785 1.8 1.815 V Reference Tempco1 ±10 ppm/°C Output Impedance2 0.1 Ω Short Circuit Current1 4.5 mA Short circuit to ground Voltage Noise1 33 μV p-p 0.05 Hz to 150 Hz (ECG band) 17 μV p-p 0.05 Hz to 5 Hz (respiration) CALIBRATION DAC Available on CAL_DAC_IO (output for master, input for slave) DAC Resolution 10 Bits Full-Scale Output Voltage 2.64 2.7 2.76 V No load, nominal FS output is 1.5 × REFOUT Zero-Scale Output Voltage 0.24 0.3 0.36 V No load DNL −1 +1 LSB Output Series Resistance2 10 kΩ Not intended to drive low impedance load, used for slave CAL_DAC_IO configured as an input Input Current ±5 nA When used as input CALIBRATION DAC TEST TONE Output Voltage 0.9 1 1.1 mV p-p Rides on common-mode voltage, VCM_REF = 1.3 V Square Wave 1 Hz Low Frequency Sine Wave 10 Hz High Frequency Sine Wave 150 Hz SHIELD DRIVER (ADAS1000/ ADAS1000-1 ONLY) Output Voltage Range 0.3 2.3 V Rides on common-mode voltage, VCM Gain 1 V/V Offset Voltage −20 +20 mV Short Circuit Current 15 25 μA Output current limited by internal series resistance Stable Capacitive Load2 10 nF CRYSTAL OSCILLATOR Applied to XTAL1 and XTAL2 Frequency2 8.192 MHz Start-Up Time2 15 ms Internal startup |
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