LTC2498 24-Bit 8-/16-Channel S ADC with Easy Drive Input Current Cancellation Features Description n Up to 8 Differential or 16 Single-Ended Inputs The LTC 2498 is a 16-channel (8-differential) 24-bit No n Easy Drive Technology Enables Rail-to-Rail Latency S 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 Integrated High Accuracy Temperature Sensor 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 LTC2498 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 16 n 1ppm Offset and 15ppm Full-Scale Error analog input channels operating in single ended or dif- n 2x Speed Mode (15Hz Using Internal Oscillator) ferential modes) or its internal temperature sensor. The n No Latency: Digital Filter Settles in a Single Cycle, integrated temperature sensor offers 1/30th C resolution Even After a New Channel Is Selected and 2C absolute accuracy. n Single Supply 2.7V to 5.5V Operation (0.8mW) n The LTC2498 allows a wide common mode input range Internal Oscillator n (0V to V ), independent of the reference voltage. Any Tiny QFN 5mm 7mm Package CC combination of single-ended or differential inputs can be selected and the first conversion after a new channel is a selected is valid. Access to the multiplexer output enables optional external amplifiers to be shared between all analog n Direct Sensor Digitizer inputs and auto calibration continuously removes their n Direct Temperature Measurement associated offset and drift. n Instrumentation L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Industrial Process Control No Latency and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. t a Internal Sensor Absolute Temperature Error Data Acquisition System with Temperature Compensation 5 2.7V TO 5.5V 4 3 CH0 MUXOUT/ V CC 0.1F 10F ADCIN 2 CH1 + REF 1 + IN SDI CH7 16-CHANNEL 0 24-BIT ADC SCK 4-WIRE CH8 MUX WITH EASY DRIVE SDO SPI INTERFACE 1 IN CS 2 CH15 REF COM 3 f O 4 TEMPERATURE MUXOUT/ OSC SENSOR ADCIN 5 55 30 5 20 45 70 95 120 2498 TA01a TEMPERATURE (C) 2498 TA01b 2498fg 1 For more information www.linear.com/LTC2498 ABSOLUTE ERROR (C) pplication ypical pplicationsLTC2498 a Maxi Mu M r p c F (Notes 1, 2) TOP VIEW Supply Voltage (V ) ................................... 0.3V to 6V CC Analog Input Voltage 38 37 36 35 34 33 32 (CH0 to CH15, COM) .................0.3V to (V + 0.3V) CC GND 1 31 GND Reference Input Voltage NC 2 30 REF + ADCINN, ADCINP, MUXOUTP, GND 3 29 REF GND V 4 28 CC MUXOUTN ................................0.3V to (V + 0.3V) CC GND MUXOUTN 5 27 Digital Input Voltage......................0.3V to (V + 0.3V) CC GND ADCINN 6 26 39 Digital Output Voltage ...................0.3V to (V + 0.3V) COM 7 25 ADCINP CC CH0 8 MUXOUTP 24 Operating Temperature Range CH1 9 23 CH15 LTC2498C ................................................ 0C to 70C CH2 10 22 CH14 LTC2498I .............................................40C to 85C CH3 11 21 CH13 LTC2498H .......................................... 40C to 125C CH4 12 20 CH12 13 14 15 16 17 18 19 Storage Temperature Range .................. 65C to 150C 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 o r D i n F M LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2498CUHF PBF LTC2498CUHF TRPBF 2498 38-Lead (5mm 7mm) Plastic QFN 0C to 70C LTC2498IUHF PBF LTC2498IUHF TRPBF 2498 38-Lead (5mm 7mm) Plastic QFN 40C to 85C LTC2498HUHF PBF LTC2498HUHF TRPBF 2498 38-Lead (5mm 7mm) Plastic QFN 40C to 125C 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: