Datasheet AD74413R (Analog Devices) - 9

Data Sheet AD74413R CURRENT INPUT LOOP POWERED
AVDD = 14 V to 28.8 V, AGND = DGND = 0 V, REFIN = 2.5 V (ideal), DVCC = 2.7 V to 5.5 V, IOVDD = 1.7 V to 5.5 V, and all specifications at TA = −40°C to +105°C, unless otherwise noted. CLOAD = 10 nF per recommended configuration, RSENSE = 100 Ω (ideal), AGND − 0.5 V < I/OP_x screw terminals voltage < AVDD − 0.2 V.
Table 5. Parameter Min Typ Max Unit Test Conditions/Comments
CURRENT INPUTS Input Resolution 16 Bits Input Range 0 25 mA Sensed across external 100 Ω resistor Programmable Current Limit 0.5 24.5 mA Typical programmable current limit, current input, loop powered enabled, 13-bit resolution HART Mode Current Limit 23 30 mA Current input, loop powered with HART enabled, nonprogrammable ACCURACY TUE1 −0.1 +0.1 %FSR TUE at 25°C1 −0.05 +0.05 %FSR INL −10 ±2 +10 LSB Linearity specified from 0.1 mA to 25 mA range Offset Error −5 ±2 +5 LSB Offset Error at 25°C −4 +4 LSB Gain Error1 −250 ±200 +250 ppm FSR Gain Error at 25°C1 −250 +250 ppm FSR OTHER INPUT SPECIFICATIONS DC PSRR2 150 nA/V Input Impedance (Without 140 Ω With current input, loop powered selected, includes 100 Ω HART Compatibility) RSENSE Input Impedance (with HART 230 315 Ω With current input, loop powered with HART selected, Compatibility) includes 100 Ω RSENSE Headroom (Without HART 4.6 V Minimum required difference between AVDD and the I/OP_x Compatibility) screw terminal voltage to source 25 mA; current input, loop powered selected Headroom (with HART 6.7 V Minimum required difference between AVDD and the I/OP_x Compatibility) screw terminal voltage to source 20 mA; current input, loop powered with HART selected 1 RSENSE accuracy directly impacts the TUE and gain error. 2 Guaranteed by design and characterization.
RESISTANCE MEASUREMENT
AVDD = 14 V to 28.8 V, AGND = DGND = 0 V, REFIN = 2.5 V (ideal), DVCC = 2.7 V to 5.5 V, IOVDD = 1.7 V to 5.5 V, and all specifications at TA = −40°C to +105°C, unless otherwise noted. RSENSE = 100 Ω (ideal). External current limiting resistor of 2 kΩ (ideal) connected to the SENSEH_x pin.
Table 6. Parameter Min Typ Max Unit Test Conditions/Comments
RESISTANCE MEASUREMENT Input Range 0 1 MΩ 2-wire RTD measurements supported Bias Voltage 2.5 V Pull-Up Resistor (RPULL-UP) 2.1 kΩ RPULL-UP is comprised of the external 2 kΩ resistor and the external 100 Ω RSENSE ACCURACY Measurement Range 0 Ω to 50 Ω 0.28 Ω 50 Ω to 3 kΩ ±0.07%, ±% of measured value plus ± fixed error ±0.23 Ω 3 kΩ to 10 kΩ −0.15 ±0.1 +0.15 % ±% of measured value 10 kΩ to 200 kΩ −3.0 ±1.3 +3.0 % ±% of measured value 200 kΩ to 1 MΩ −15 ±6.0 +15 % ±% of measured value Rev. 0 | Page 9 of 70 Document Outline Features Applications General Description Companion Products Product Highlights Revision History Functional Block Diagram Specifications Voltage Output Current Output Voltage Input Current Input Externally Powered and Current Input Externally Powered with HART Current Input Loop Powered Resistance Measurement Digital Input Logic Digital Input Loop Powered ADC Specifications General Specifications Timing Characteristics SPI Timing Specifications Timing Diagrams Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Voltage Output Current Output Digital Input Resistance Measurement Reference ADC Supplies Theory of Operation Robust Architecture Serial Interface DAC Architecture ADC Overview Reference Reference Noise Charge Pump Power-On State of the AD74413R Device Functions High Impedance Interpreting ADC Data Voltage Output Mode Voltage Output Short-Circuit Protection Interpreting ADC Data Current Output Mode Current Output Open Circuit Detection Interpreting ADC Data HART Compatibility Voltage Input Mode Selectable 200 kΩ to GND Interpreting ADC Data Thermocouple Measurement Current Input, Externally Powered Mode Short-Circuit Protection Interpreting ADC Data Current Input, Externally Powered with HART Compatibility Mode Current Input, Loop Powered Mode Short-Circuit Protection Interpreting ADC Data Current Input, Loop Powered with HART Compatibility Mode Resistance Measurement (External 2-Wire RTD) Interpreting ADC Data Digital Input Logic Interpreting ADC Data Digital Input Threshold Setting Digital Input Current Sink Debounce Function Debounce Mode 0 (Default) Debounce Mode 1 Digital Input Inverter Digital Input Counter Digital Input, Loop Powered Mode Interpreting ADC Data Getting Started Using Channel Functions Switching Channel Functions ADC Functionality ADC Conversion Rates ADC_RDYb Functionality ADC Output Data Format ADC Noise Diagnostics DACs LDAC Function Clear Code Function Digital Linear Slew Rate Control HART Compliant Slew Driving Inductive Loads Reset Function Thermal Alert and Thermal Reset Faults and Alerts Channel Faults Power Supply Monitors GPO_x Pins SPI Interface and Diagnostics SPI CRC SPI Interface SCLK Count Feature Readback Mode Streaming Mode Auto Readback Board Design and Layout Considerations Applications Information Register Map NOP Register Function Setup Register per Channel ADC Configuration Register per Channel Digital Input Configuration Register per Channel GPO Parallel Data Register GPO Configuration Register per Channel Output Configuration Register per Channel DAC Code Register per Channel DAC Clear Code Register per Channel DAC Active Code Register per Channel Digital Input Threshold Register ADC Conversion Control Register Diagnostics Select Register Digital Output Level Register ADC Conversion Results Register per Channel Diagnostic Results Registers per Diagnostic Channel Alert Status Register Live Status Register Alert Mask Register Debounced DIN Count Register per Channel Readback Select Register Thermal Reset Enable Register Command Register Scratch or Spare Register Silicon Revision Register Outline Dimensions Ordering Guide