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AD7711ASQ Scheda tecnica(PDF) 3 Page - Analog Devices |
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AD7711ASQ Scheda tecnica(HTML) 3 Page - Analog Devices |
3 / 27 page Parameter A, S Versions1 Units Conditions/Comments VBIAS INPUT 12 Input Voltage Range AVDD – 0.85 × VREF See VBIAS Input Section or AVDD – 3.5 V max Whichever Is Smaller; +5 V/–5 V or +10 V/0 V Nominal AVDD/VSS or AVDD – 2.1 V max Whichever Is Smaller; +5 V/0 V Nominal AVDD/VSS VSS + 0.85 × V REF See VBIAS Input Section or VSS + 3 V min Whichever Is Greater; +5 V/–5 V or +10 V/0 V Nominal AVDD/VSS or VSS + 2.1 V min Whichever Is Greater; +5 V/0 V Nominal AVDD/VSS VBIAS Rejection 65 to 85 dB typ Increasing with Gain LOGIC INPUTS Input Current ±10 µA max All Inputs except MCLK IN VINL, Input Low Voltage 0.8 V max VINH, Input High Voltage 2.0 V min MCLK IN Only VINL, Input Low Voltage 0.8 V max VINH, Input High Voltage 3.5 V min LOGIC OUTPUTS VOL, Output Low Voltage 0.4 V max ISINK = 1.6 mA VOH, Output High Voltage DVDD – 1 V min ISOURCE = 100 µA Floating State Leakage Current ±10 µA max Floating State Output Capacitance13 9 pF typ TRANSDUCER BURNOUT Current 4.5 µA nom Initial Tolerance @ +25 °C ±10 % typ Drift 0.1 %/ °C typ RTD EXCITATION CURRENT Output Current 400 µA nom Initial Tolerance @ +25 °C ±20 % max Drift 20 ppm/ °C typ Line Regulation (AVDD) 400 nA/V max AVDD = +5 V Load Regulation 400 nA/V max Output Compliance AVDD – 2 V max SYSTEM CALIBRATION Positive Full-Scale Calibration Limit14 (1.05 × V REF)/GAIN V max GAIN Is the Selected PGA Gain (Between 1 and 128) Negative Full-Scale Calibration Limit14 –(1.05 × V REF)/GAIN V max GAIN Is the Selected PGA Gain (Between 1 and 128) Offset Calibration Limit15 –(1.05 × V REF)/GAIN V max GAIN Is the Selected PGA Gain (Between 1 and 128) Input Span15 0.8 × V REF/GAIN V min GAIN Is the Selected PGA Gain (Between 1 and 128) (2.1 × V REF)/GAIN V max GAIN Is the Selected PGA Gain (Between 1 and 128) NOTES 12The AD7711A is tested with the following V BIAS voltages. With AV DD = +5 V and VSS = 0 V, V BIAS = +2.5 V, with AVDD = +10 V and V SS = 0 V, VBIAS = +5 V and with AVDD = +5 V and VSS = –5 V, VBIAS = 0 V. 13Guaranteed by design, not production tested. 14After calibration, if the analog input exceeds positive full scale, the converter will output all 1s. If the analog input is less than negative full scale, then the device will output all 0s. 15These calibration and span limits apply provided the absolute voltage on the analog inputs does not exceed AV DD + 30 mV or go more negative than V SS – 30 mV. The offset calibration limit applies to both the unipolar zero point and the bipolar zero point. AD7711A –3– REV. C |
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