LTC2497 16-Bit 8-/16-Channel DS ADC with Easy Drive Input Current 2 Cancellation and I C Interface Fea T Descrip T n Up to Eight Differential or 16 Single-Ended Inputs The LTC 2497 is a 16-channel (eight differential), 16-bit, TM TM n Easy Drive Technology Enables Rail-to-Rail No Latency DS ADC with Easy Drive technology and 2 Inputs with Zero Differential Input Current a 2-wire, I C interface. The patented sampling scheme n Directly Digitizes High Impedance Sensors with eliminates dynamic input current errors and the shortcom- Full Accuracy ings of on-chip buffering through automatic cancellation of 2 n 2-Wire I C Interface with 27 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 n 600nV RMS Noise (0.02LSB Transition Noise) digitized while maintaining exceptional DC accuracy. n GND to V Input/Reference Common Mode Range CC The LTC2497 includes an integrated oscillator. This device n Simultaneous 50Hz/60Hz Rejection can be configured to measure an external signal from com- n 2ppm INL, No Missing Codes binations of 16 analog input channels operating in single- n 1ppm Offset and 15ppm Full-Scale Error ended or differential modes. It automatically rejects line n No Latency: Digital Filter Settles in a Single Cycle, frequencies of 50Hz and 60Hz simultaneously. Even After a New Channel Is Selected n The LTC2497 allows a wide, common mode input range Single Supply, 2.7V to 5.5V Operation (0.8mW) n (0V to V ), independent of the reference voltage. Any Internal Oscillator CC n combination of single-ended or differential inputs can be Tiny 5mm 7mm QFN Package selected and the first conversion, after a new channel is selected, is valid. Access to the multiplexer output enables a T optional external amplifiers to be shared between all n Direct Sensor Digitizer analog inputs and auto calibration continuously removes n Direct Temperature Measurement their associated offset and drift. n Instrumentation L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency and Easy Drive are trademarks of Linear Technology Corporation. All other n Industrial Process Control trademarks are the property of their respective owners. Typical a T + Easy Drive Data Acquisition System +FS Error vs R at IN and IN SOURCE 80 2.7V TO 5.5V V = 5V CC V = 5V REF 60 + V = 3.75V IN CH0 MUXOUT/ V 10F 0.1F CC V = 1.25V IN ADCIN CH1 40 f = GND O T = 25C A 20 + REF 1.7k + C = 1mF CH7 IN IN 16-CHANNEL 0 CH8 SDA 16-BIT ADC 2-WIRE MUX 2 WITH EASY DRIVE I C INTERFACE SCL 20 IN CH15 REF 40 COM 60 f O MUXOUT/ OSC ADCIN 80 2497 TA01 1 10 100 1k 10k 100k R () SOURCE 2497 TA01b 2497fb For more information www.linear.com/LTC2497 1 +FS ERROR (ppm) ion pplica ions pplica ion uresLTC2497 a Te Maxi Mu M r a T p in c F T (Notes 1, 2) TOP VIEW Supply Voltage (V ) ................................... 0.3V to 6V CC Analog Input Voltage 38 37 36 35 34 33 32 (CH0-CH15, COM) .....................0.3V to (V + 0.3V) CC GND 1 31 GND + REF , REF ................................0.3V to (V + 0.3V) CC SCL 2 30 REF + ADCINN, ADCINP, SDA 3 29 REF MUXOUTP MUXOUTN ..............0.3V to (V + 0.3V) GND 4 28 V CC CC NC 5 27 MUXOUTN Digital Input Voltage......................0.3V to (V + 0.3V) CC GND 6 26 ADCINN Digital Output Voltage ...................0.3V to (V + 0.3V) CC 39 COM 7 25 ADCINP Operating Temperature Range CH0 8 24 MUXOUTP LTC2497C .................................................0C to 70C CH1 9 23 CH15 LTC2497I ............................................. 40C to 85C CH2 10 22 CH14 Storage Temperature Range ...................65C to 150C CH3 11 21 CH13 CH4 12 20 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 o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2497CUHF PBF LTC2497CUHF TRPBF 2497 0C to 70C 38-Lead (5mm 7mm) Plastic QFN LTC2497IUHF PBF LTC2497IUHF TRPBF 2497 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: