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AD7785 Fiches technique(PDF) 4 Page - Analog Devices |
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AD7785 Fiches technique(HTML) 4 Page - Analog Devices |
4 / 32 page AD7785 Rev. 0 | Page 4 of 32 Parameter AD7785B1 Unit Test Conditions/Comments REFERENCE Internal Reference Internal Reference Initial Accuracy 1.17 ± 0.01% V min/max AVDD = 4 V, TA = 25°C Internal Reference Drift2 4 ppm/°C typ 15 ppm/°C max Power Supply Rejection 85 dB typ External Reference External REFIN Voltage 2.5 V nom REFIN = REFIN(+) − REFIN(−) Reference Voltage Range2 0.1 V min AVDD V max When VREF = AVDD, the differential input must be limited to 0.9 × VREF /gain if the in-amp is active Absolute REFIN Voltage Limits2 GND − 30 mV V min AVDD + 30 mV V max Average Reference Input Current 400 nA/V typ Average Reference Input Current Drift ±0.03 nA/V/°C typ Normal Mode Rejection Same as for analog inputs Common-Mode Rejection 100 dB typ EXCITATION CURRENT SOURCES (IEXC1 and IEXC2) Output Current 10/210/1000 μA nom Initial Tolerance at 25°C ±5 % typ Drift 200 ppm/°C typ Current Matching ±0.5 % typ Matching between IEXC1 and IEXC2; VOUT = 0 V Drift Matching 50 ppm/°C typ Line Regulation (VDD) 2 %/V typ AVDD = 5 V ± 5% Load Regulation 0.2 %/V typ Output Compliance AVDD − 0.65 V max 10 μA or 210 μA currents selected AVDD − 1.1 V max 1 mA currents selected GND − 30 mV V min TEMPERATURE SENSOR Accuracy Sensitivity ±2 0.81 °C typ mV/°C typ Applies if user calibrates the temperature sensor Applies if user calibrates the temperature sensor BIAS VOLTAGE GENERATOR VBIAS AVDD/2 V nom VBIAS Generator Start-Up Time See Figure 10 ms/nF typ Dependent on the capacitance on the AIN pin INTERNAL/EXTERNAL CLOCK Internal Clock Frequency2 64 ± 3% kHz min/max Duty Cycle 50:50 % typ External Clock Frequency 64 kHz nom A 128 kHz external clock can be used if the divide-by-2 function is used (Bit CLK1 = CLK0 = 1) Duty Cycle 45:55 to 55:45 % typ Applies for external 64 kHz clock; a 128 kHz clock can have a less stringent duty cycle LOGIC INPUTS CS2 VINL, Input Low Voltage 0.8 V max DVDD = 5 V VINH, Input High Voltage 0.4 2.0 V max V min DVDD = 3 V DVDD = 3 V or 5 V |
Numéro de pièce similaire - AD7785_15 |
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Description similaire - AD7785_15 |
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