LTC2486 16-Bit 2-/4-Channel S ADC with PGA and Easy Drive Input Current Cancellation FEATURES DESCRIPTION n Up to 2 Differential or 4 Single-Ended Inputs The LTC 2486 is a 4-channel (2-channel differential), n Easy Drive Technology Enables Rail-to-Rail Inputs 16-bit, No Latency S ADC with Easy Drive technology. 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 RMS Noise This allows large external source impedances and rail-to- n Programmable Gain from 1 to 256 rail input signals to be directly digitized while maintaining n Integrated High Accuracy Temperature Sensor exceptional DC accuracy. n GND to V Input/Reference Common Mode Range CC The LTC2486 includes programmable gain, a high accuracy n Programmable 50Hz, 60Hz, or Simultaneous temperature sensor, and an integrated oscillator. This de- 50Hz/60Hz Rejection Mode vice can be configured to measure an external signal (from n 2ppm INL, No Missing Codes combinations of 4 analog input channels operating in single n 1ppm Offset and 15ppm Full-Scale Error ended or differential modes) or its internal temperature n 2x Speed Mode/Reduced Power Mode (15Hz Using sensor. It can be programmed to reject line frequencies of Internal Oscillator and 80A at 7.5Hz Output) 50Hz, 60Hz, or simultaneous 50Hz/60Hz, provide a pro- n No Latency: Digital Filter Settles in a Single Cycle, grammable gain from 1 to 256 in 8 steps, and configured to Even After a New Channel is Selected double its output rate. The integrated temperature sensor n Single Supply 2.7V to 5.5V Operation (0.8mW) offers 1/2C resolution and 2C absolute accuracy. n Internal Oscillator n Tiny 4mm 3mm DFN Package The LTC2486 allows a wide common mode input range (0V to V ), independent of the reference voltage. Any CC combination of single-ended or differential inputs can APPLICATIONS 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 of Linear Technology Corporation. No Latency S and Easy Drive are trademarks of Linear Technology n Instrumentation Corporation. All other trademarks are the property of their respective owners. n Industrial Process Control TYPICAL APPLICATION Data Acquisition System with Temperature Compensation Absolute Temperature Error 2.7V TO 5.5V 5 4 0.1F 10F CH0 V CC 3 CH1 2 + REF 1 + IN SDI 4-CHANNEL 0 SCK 16-BIT ADC 4-WIRE MUX WITH EASY-DRIVE SDO SPI INTERFACE 1 CH2 IN CS CH3 2 REF COM 3 f 4 O TEMPERATURE OSC SENSOR 5 55 30 5 20 45 70 95 120 2486 TA01a TEMPERATURE (C) 2486 TA01b 2486fe 1 For more information www.linear.com/LTC2486 ABSOLUTE ERROR (C)LTC2486 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) Supply Voltage (V ) ................................... 0.3V to 6V CC F 1 14 REF O Analog Input Voltage + SDI 2 13 REF (CH0 to CH3, COM) ...................0.3V to (V + 0.3V) CC SCK 3 12 V 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) CC COM 7 8 CH0 Operating Temperature Range DE PACKAGE LTC2486C ................................................ 0C to 70C 14-LEAD (4mm 3mm) PLASTIC DFN LTC2486I .............................................40C to 85C T = 125C, = 37C/W JMAX JA EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range .................. 65C to 150C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2486CDE PBF LTC2486CDE TRPBF 2486 14-Lead (4mm 3mm) Plastic DFN 0C to 70C LTC2486IDE PBF LTC2486IDE TRPBF 2486 40C to 85C 14-Lead (4mm 3mm) Plastic DFN 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: