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AD74115 Datasheet(PDF) 9 Page - Analog Devices |
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AD74115 Datasheet(HTML) 9 Page - Analog Devices |
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9 / 103 page ![]() Data Sheet AD74115 SPECIFICATIONS analog.com Rev. 0 | 9 of 103 Table 8. 4-Wire RTD Measurement (Continued) Parameter Min Typ Max Unit Test Conditions/Comments ACCURACY1 Measurement Range 1 Ω to 40 Ω ±0.036, ±0.006 %, Ω ±% of the measured value plus ± the fixed error, suitable for Pt10, Cu10, or similar, and 1 mA excitation current, and 104.16 mV ADC range 10 Ω to 400 Ω ±0.037, ±0.018 %, Ω ±% of the measured value, suitable for Pt100 or similar, and 1 mA excitation current, and 0.625 V ADC range 100 Ω to 4 kΩ ±0.084, ±0.344 %, Ω ±% of the measured value, suitable for Pt1000, 500 μA excitation current, and 0 V to 12 V ADC range 1 Guaranteed by design and characterization. DIGITAL INPUT LOGIC AVDD = +6 V to +28.8 V, AVSS = −2.5 V to −18 V, AGND = DGND = 0 V, REFIN = +2.5 V (ideal), DVCC = +2.7 V to +5.5 V, AVCC = +4.5 V to +5.5 V, and all specifications are at TA = −40°C to +105°C, unless otherwise noted. RSENSE = 100 Ω (ideal) and CLOAD = 4.7 nF per the recommended configuration. Table 9. Digital Input Logic Parameter Min Typ Max Unit Test Conditions/Comments DIGITAL INPUTS Unbuffered Input Data Rate 200 kHz The VIOUT pin is driven by a low impedance source, 0 V to 12 V signal, duty cycle: 60:40 Buffered Input Data Rate 20 kHz The SENSEL pin is driven by a low impedance source, 0 V to 12 V signal, duty cycle: 60:40 Input Voltage Range1 −45 +45 V Input Resistance 1.3 MΩ High speed mode Open-Circuit Detect Current 0.05 0.35 mA Window for open-circuit detection for compliance with IEC 61131-2 Type 3D Short-Circuit Detect Current 6 mA For IEC 61131-2 Type 3D CURRENT SINK Range 0 Series Resistor Value 2.7 kΩ Current Sink Range 0 3.7 mA Typical programmable current sink to AGND Current Sink Resolution 120 µA Current Sink Accuracy ±2 % FSR Current Sink at Decimal Code 20 2.1 2.4 mA Recommended for IEC 61131-2 Type I and Type III for the I/OP screw terminal > 6 V, DIN_SINK = Decimal Code 20 Current Sink at Decimal 15 1.8 mA Recommended for IEC 61131-2 Type 3D, DIN_SINK bits = Decimal Code 15 Range 1 Series Resistor Value 1 kΩ Current Sink Range 0 7.4 mA Typical programmable current sink to AGND Current Sink Resolution 240 µA Current Sink Accuracy ±2 % FSR Current Sink at Decimal Code 29 6.1 7.0 mA Recommended for IEC 61131-2 Type II for the I/OP screw terminal > 7 V, DIN_SINK bits = Decimal Code 29 VOLTAGE THRESHOLDS MODES Threshold Range AVSS + 2.0 AVDD – 1.5 V Programmable trip level AVDD Threshold Mode Threshold Resolution AVDD/50 V |
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