Datasheet LTC2984 (Analog Devices) - 4

LTC2984
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
Supply Voltage l 2.85 5.25 V Supply Current l 15 20 mA Sleep Current l 25 60 µA Input Range All Analog Input Channels l –0.05 VDD – 0.3 V Output Rate Two Conversion Cycle Mode (Notes 6, 9) l 150 164 170 ms Output Rate Three Conversion Cycle Mode (Notes 6, 9) l 225 246 255 ms Input Common Mode Rejection 50Hz/60Hz (Note 4) l 120 dB Input Normal Mode Rejection 60Hz (Notes 4, 7) l 120 dB 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 19) 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 33 25 % RTD Excitation Current Matching Continuously Calibrated l Error within Noise Level of ADC Thermistor Excitation Current (Note 16) l –37.5 Table 57 37.5 % 2984fb 4 For more information www.linear.com/LTC2984 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Complete System Electrical Characteristics ADC Electrical Characteristics Reference Electrical Characteristics Digital Inputs and Digital Outputs EEPROM Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuits Timing Diagram Overview Applications Information EEPROM Overview Eeprom Read/Write Validation EEPROM Write Operation EEPROM Read Operation Thermocouple Measurements Diode Measurements RTD Measurements Thermistor Measurements Supplemental Information Direct ADC Measurements Fault Protection and Anti-Aliasing 2- and 3-Cycle Conversion Modes Running Conversions Consecutively on Multiple Channels Entering/Exiting Sleep Mode MUX Configuration Delay Global Configuration Register Reference Considerations Custom Thermocouples Custom RTDs Custom Thermistors Package Description Revision History Typical Application Related Parts