LTC2492 24-Bit 2-/4-Channel S ADC with Easy Drive Input Current Cancellation Fea T Descrip T n Up to 2 Differential or 4 Single-Ended Inputs The LTC 2492 is a 4-channel (2-channel differential), n Easy Drive Technology Enables Rail-to-Rail 24-bit, No Latency ADC with Easy Drive technology. Inputs with Zero Differential Input Current The patented sampling scheme eliminates dynamic input n Directly Digitizes High Impedance Sensors with current errors and the shortcomings of on-chip buffering Full Accuracy through automatic cancellation of differential input current. n 600nV Noise This allows large external source impedances and rail-to- RMS n Integrated High Accuracy Temperature Sensor rail input signals to be directly digitized while maintaining n GND to V Input/Reference Common Mode Range exceptional DC accuracy. CC n Programmable 50Hz, 60Hz, or Simultaneous The LTC2492 includes a high accuracy temperature sensor 50Hz/60Hz Rejection Mode and an integrated oscillator. This device can be configured n 2ppm INL, No Missing Codes to measure an external signal (from combinations of 4 n 1ppm Offset and 15ppm Full-Scale Error analog input channels operating in single-ended or dif- n 2x Speed Mode/Reduced Power Mode (15Hz Using ferential modes) or its internal temperature sensor. It can Internal Oscillator and 80A at 7.5Hz Output) be programmed to reject line frequencies of 50Hz, 60Hz, n No Latency: Digital Filter Settles in a Single Cycle, or simultaneous 50Hz/60Hz and configured to double Even After a New Channel is Selected its output rate. The integrated temperature sensor offers n Single Supply 2.7V to 5.5V Operation (0.8mW) 1/30thC resolution and 2C absolute accuracy. n Internal Oscillator n The LTC2492 allows a wide common mode input range Tiny DFN 4mm 3mm Package (0V to V ), independent of the reference voltage. Any CC combination of single-ended or differential inputs can a T be selected and the first conversion after a new channel n Direct Sensor Digitizer selection is valid. n Direct Temperature Measurement L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Easy Drive and No Latency S are trademarks of Linear Technology Corporation. All other n Instrumentation trademarks are the property of their respective owners. n Industrial Process Control Typical a T Absolute Temperature Error Data Acquisition System with Temperature Compensation 2.7V TO 5.5V 5 4 10F 0.1F 3 V CH0 CC CH1 2 1 + REF + IN SDI 0 4-CHANNEL SCK 24-BIT ADC 4-WIRE 1 MUX WITH EASY-DRIVE SDO SPI INTERFACE CH2 2 IN CS CH3 REF 3 COM 4 f O 5 TEMPERATURE OSC 55 30 5 20 45 70 95 120 SENSOR TEMPERATURE (C) 2492 TA01a 2492 TA01b 2492fe 1 For more information www.linear.com/LTC2492 ABSOLUTE ERROR (C) ion pplica ions pplica ion uresLTC2492 a T e m r a T p c F T (Notes 1, 2) Supply Voltage (V ) ...................................0.3V to 6V CC f 1 14 REF O + Analog Input Voltage SDI 2 13 REF SCK 3 12 V CC (CH0 to CH3, COM) .................. 0.3V to (V + 0.3V) CC + CS 4 15 11 CH3 REF , REF .................................. 0.3V to (V + 0.3V) CC SDO 5 10 CH2 Digital Input Voltage..................... 0.3V to (V + 0.3V) CC GND 6 9 CH1 Digital Output Voltage .................. 0.3V to (V + 0.3V) COM 7 8 CH0 CC Operating Temperature Range DE PACKAGE LTC2492C ................................................ 0C to 70C 14-LEAD (4mm 3mm) PLASTIC DFN = 125C, = 37C/W T JMAX JA LTC2492I .............................................40C to 85C EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range ..................65C to 150C o r D i n F T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2492CDE PBF LTC2492CDE TRPBF 2492 14-Lead (4mm 3mm) Plastic DFN 0C to 70C LTC2492IDE PBF LTC2492IDE TRPBF 2492 14-Lead (4mm 3mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: