Datasheet LTC2983 (Analog Devices) - 4

LTC2983
COMPLETE SYSTEM ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Normal Mode Rejection 50Hz (Notes 4, 8) l 120 dB Input Normal Mode Rejection 50Hz/60Hz (Notes 4, 6, 9) l 75 dB Power-On Reset Threshold 2.25 V Analog Power-Up (Note 11) l 100 ms Digital Initialization (Note 12) l 100 ms
ADC ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) –FS ≤ VIN ≤ + FS l 24 Bits Integral Nonlinearity VIN(CM) = 1.25V (Note 15) l 2 30 ppm of VREF Offset Error l 0.5 2 µV Offset Error Drift (Note 4) l 10 20 nV/°C Positive Full-Scale Error (Notes 3, 15) l 100 ppm of VREF Positive Full-Scale Drift (Notes 3, 15) l 0.1 0.5 ppm of VREF/°C Input Leakage (Note 18) l 1 nA H-Grade l 10 nA Negative Full-Scale Error (Notes 3, 15) l 100 ppm of VREF Negative Full-Scale Drift (Notes 3, 15) l 0.1 0.5 ppm of VREF/°C Input Referred Noise (Note 5) l 0.8 1.5 µVRMS H-Grade l 2.0 µVRMS Common Mode Input Range l –0.05 VDD – 0.3 V RTD Excitation Current (Note 16) l –25 Table 30 25 % RTD Excitation Current Matching Continuously Calibrated l Error within Noise Level of ADC Thermistor Excitation Current (Note 16) l –37.5 Table 53 37.5 %
REFERENCE ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage VREFOUT (Note 10) 2.49 2.51 V Output Voltage Temperature Coefficient I-Grade, H-Grade l 3 15 ppm/°C Output Voltage Temperature Coefficient C-Grade l 3 20 ppm/°C Line Regulation l 10 ppm/V Load Regulation IOUT(SOURCE) = 100µA l 5 mV/mA IOUT(SINK) = 100µA l 5 mV/mA Output Voltage Noise 0.1Hz ≤ f ≤ 10Hz 4 µVP-P 10Hz ≤ f ≤ 1kHz 4.5 µVP-P Output Short-Circuit Current Short VREFOUT to GND 40 mA Short VREFOUT to VDD 30 mA Turn-On Time 0.1% Setting, CLOAD = 1µF 115 µs Long Term Drift of Output Voltage (Note 13) 60 ppm/√khr Hysteresis (Note 14) ∆T = 0°C to 70°C 30 ppm ∆T = –40°C to 85°C 70 ppm 2983fc 4 For more information www.linear.com/LTC2983 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Complete System Electrical Characteristics Pin Configuration ADC Electrical Characteristics Reference Electrical Characteristics Digital Inputs and Digital Outputs Typical Performance Characteristics Pin Functions Block Diagram Test Circuits Timing Diagram Overview Applications Information Thermocouple Measurements Diode Measurements RTD Measurements Thermistor Measurements Direct ADC Measurements Supplemental Information Fault Protection and Anti-Aliasing 2- and 3-Cycle Conversion Modes Running Conversions Consecutively on Multiple Channels MUX Configuration Delay Global Configuration Register Custom Thermocouples Custom RTDs Custom Thermistors Package Description Revision History Typical Application Related Parts