LTC2494 16-Bit 8-/16-Channel DS ADC with PGA and Easy Drive Input Current Cancellation Features Description n Up to 8 Differential or 16 Single-Ended Inputs The LTC 2494 is a 16-channel (8-differential), 16-bit, No TM n Easy Drive Technology Enables Rail-to-Rail Latency DS ADC with Easy Drive technology. The pat- Inputs with Zero Differential Input Current ented sampling scheme eliminates dynamic input current n Directly Digitizes High Impedance Sensors with errors and the shortcomings of on-chip buffering through Full Accuracy automatic cancellation of differential input current. This n 600nV RMS Noise allows large external source impedances, and rail-to-rail n Programmable Gain from 1 to 256 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 LTC2494 includes programmable gain, a high accu- n Programmable 50Hz, 60Hz or Simultaneous racy temperature sensor and an integrated oscillator. This 50Hz/60Hz Rejection Mode device can be configured to measure an external signal n 2ppm INL, No Missing Codes (from combinations of 16 analog input channels operat- n 1ppm Offset and 15ppm Full-Scale Error ing in single-ended or differential modes) or its internal n 2x Speed Mode/Reduced Power Mode (15Hz Using temperature sensor. The integrated temperature sensor Internal Oscillator and 80A at 7.5Hz Output) offers 1/2C resolution and 2C absolute accuracy. The n No Latency: Digital Filter Settles in a Single Cycle, LTC2494 can be configured to provide a programmable Even After a New Channel Is Selected gain from 1 to 256 in 8 steps. n Single-Supply 2.7V to 5.5V Operation n The LTC2494 allows a wide common mode input range Internal Oscillator n (0V to V ), independent of the reference voltage. Any Tiny 5mm 7mm QFN Package CC combination of single-ended or differential inputs can be a selected and the first conversion, after a new channel is selected, is valid. 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 trademarks are the property of their respective owners. n Instrumentation n Industrial Process Control t ypical a Data Acquisition System with Temperature Compensation Absolute Temperature Error 5 2.7V TO 5.5V 4 0.1F 10F V MUXOUT/ 3 CH0 CC ADCIN CH1 2 + 1 REF + CH7 IN SDI 0 16-CHANNEL CH8 SCK 16-BIT ADC 4-WIRE MUX 1 WITH EASY-DRIVE SDO SPI INTERFACE 2 IN CS CH15 REF 3 COM 4 f O TEMPERATURE 5 MUXOUT/ OSC SENSOR 55 30 5 20 45 70 95 120 ADCIN TEMPERATURE (C) 2494 TA01a 2494 TA01b 2494fe 1 For more information www.linear.com/LTC2494 ABSOLUTE ERROR (C) pplication pplicationsLTC2494 a bsolute Maxi Mu M r p in c F (Notes 1, 2) Supply Voltage (V ) ................................... 0.3V to 6V TOP VIEW CC Analog Input Voltage (CH0 to CH15, COM) .................0.3V to (V + 0.3V) 38 37 36 35 34 33 32 CC + REF , REF ................................0.3V to (V + 0.3V) GND 1 31 GND CC NC 2 30 REF ADCINN, ADCINP, MUXOUTP, + GND 3 29 REF MUXOUTN ................................0.3V to (V + 0.3V) CC GND 4 28 V CC Digital Input Voltage......................0.3V to (V + 0.3V) CC GND 5 27 MUXOUTN Digital Output Voltage ...................0.3V to (V + 0.3V) CC GND ADCINN 6 26 39 Operating Temperature Range COM 7 25 ADCINP LTC2494C ................................................ 0C to 70C CH0 8 24 MUXOUTP LTC2494I .............................................40C to 85C CH1 9 23 CH15 CH2 10 22 CH14 Storage Temperature Range .................. 65C to 150C CH3 11 21 CH13 20 CH4 12 CH12 13 14 15 16 17 18 19 UHF PACKAGE 38-LEAD (5mm 7mm) PLASTIC QFN T = 125C, = 34C/W JMAX JA EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB Der in F M LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2494CUHF PBF LTC2494CUHF TRPBF 2494 38-Lead (5mm 7mm) Plastic QFN 0C to 70C LTC2494IUHF PBF LTC2494IUHF TRPBF 2494 38-Lead (5mm 7mm) Plastic QFN 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: