LTC2984 REFERENCE ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply overthe full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETERCONDITIONSMINTYPMAXUNITS 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 DIGITAL INPUTS AND DIGITAL OUTPUTSThe l denotes the specifications which apply over thefull operating temperature range, otherwise specifications are at TA = 25°C.SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS External SCK Frequency Range l 0 2 MHz External SCK LOW Period l 250 ns External SCK HIGH Period l 250 ns t1 CS↓ to SDO Valid l 0 200 ns t2 CS↑ to SDO Hi-Z l 0 200 ns t3 CS↓ to SCK↑ l 100 ns t4 SCK↓ to SDO Valid l 225 ns t5 SDO Hold After SCK↓ l 10 ns t6 SDI Setup Before SCK↑ l 100 ns t7 SDI HOLD After SCK↑ l 100 ns High Level Input Voltage CS, SDI, SCK, RESET l VDD – 0.5 V Low Level Input Voltage CS, SDI, SCK, RESET l 0.5 V Digital Input Current CS, SDI, SCK, RESET l –10 10 µA Digital Input Capacitance CS, SDI, SCK, RESET 10 pF LOW Level Output Voltage (SDO, INTERRUPT) IO = –800µA l 0.4 V High Level Output Voltage (SDO, INTERRUPT) IO = 1.6mA l VDD – 0.5 V Hi-Z Output Leakage (SDO) l –10 10 µA 2984fb For more information www.linear.com/LTC2984 5 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
