LTC2493 24-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface Fea T Descrip T n Up to 2 Differential or 4 Single-Ended Inputs The LTC 2493 is a 4-channel (2-channel differential), 24-bit, n Easy Drive Technology Enables Rail-to-Rail No Latency ADC with Easy Drive technology and a 2 Inputs with Zero Differential Input Current 2-wire, I C interface. The patented sampling scheme elimi- n Directly Digitizes High Impedance Sensors with nates dynamic input current errors and the shortcomings Full Accuracy of on-chip buffering through automatic cancellation of 2 n 2-Wire I C Interface with 9 Addresses Plus One differential input current. This allows large external source Global Address for Synchronization impedances and rail-to-rail input signals to be directly digi- n 600nV RMS Noise tized while maintaining exceptional DC accuracy. n Integrated High Accuracy Temperature Sensor The LTC2493 includes a high accuracy temperature n GND to V Input/Reference Common Mode Range CC sensor and an integrated oscillator. This device can be n Programmable 50Hz, 60Hz or Simultaneous configured to measure an external signal (from combi- 50Hz/60Hz Rejection Mode nations of 4 analog input channels operating in single- n 2ppm INL, No Missing Codes ended or differential modes) or its internal temperature n 1ppm Offset and 15ppm Full-Scale Error sensor. The integrated temperature sensor offers 1/30th C n 2 Speed/Reduced Power Mode (15Hz Using Internal resolution and 2C absolute accuracy. Oscillator and 80A at 7.5Hz Output) n The LTC2493 allows a wide common mode input range No Latency: Digital Filter Settles in a Single Cycle, (0V to V ), independent of the reference voltage. Any Even After a New Channel Is Selected CC n combination of single-ended or differential inputs can Single Supply 2.7V to 5.5V Operation (0.8mW) n be selected and the first conversion, after a new channel Internal Oscillator n is selected, is valid. Access to the multiplexer output en- Tiny 4mm 3mm DFN Package ables optional external amplifiers to be shared between all a T analog inputs and auto-calibration continuously removes their associated offset and drift. n Direct Sensor Digitizer L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Direct Temperature Measurement No Latency and Easy Drive are trademarks of Linear Technology Corporation. All other n trademarks are the property of their respective owners. Instrumentation n Industrial Process Control Typical a T Data Acquisition System with Temperature Compensation Integrated High Performance Temperature Sensor 2.7V TO 5.5V 5 4 0.1F 10F V CH0 CC 3 CH1 2 + REF 1 1.7k + IN 4-CHANNEL 0 24-BIT ADC SDA 2-WIRE MUX 2 WITH EASY-DRIVE I C INTERFACE SCL 1 CH2 IN CH3 2 REF CA1 9-PIN SELECTABLE COM 3 CA0 ADDRESSES 4 f O TEMPERATURE OSC 5 SENSOR 55 30 5 20 45 70 95 120 2493 vTA01a TEMPERATURE (C) 2493 TA02 2493fe 1 For more information www.linear.com/LTC2493 ABSOLUTE ERROR (C) ion pplica ions pplica ion uresLTC2493 a T e Maxi Mu 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 CA0 2 13 REF CA1 3 12 V CC (CH0 to CH3, COM) .................. 0.3V to (V + 0.3V) CC + SCL 4 15 11 CH3 REF , REF .................................. 0.3V to (V + 0.3V) CC SDA 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 LTC2493C ................................................ 0C to 70C 14-LEAD (4mm 3mm) PLASTIC DFN T = 125C, = 37C/W JMAX JA LTC2493I .............................................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 Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2493CDE PBF LTC2493CDE TRPBF 2493 14-Lead (4mm 3mm) Plastic DFN 0C to 70C LTC2493IDE PBF LTC2493IDE TRPBF 2493 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: