LTC2489 16-Bit 2-/4-Channel D ADC with Easy Drive Input Current 2 Cancellation and I C Interface Fea T Descrip T n Up to 2 Differential or 4 Single-Ended Inputs The LTC 2489 is a 4-channel (2-channel differential), TM n Easy Drive Technology Enables Rail-to-Rail 16-bit, No Latency D ADC with Easy Drive technology 2 Inputs with Zero Differential Input Current and 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 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 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 LTC2489 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 4 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 LTC2489 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 4mm 3mm DFN 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 analog inputs and auto calibration continuously removes n Direct Sensor Digitizer their associated offset and drift. n Direct Temperature Measurement L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Instrumentation Easy Drive and No Latency D are trademarks of Linear Technology Corporation. All other n trademarks are the property of their respective owners. Industrial Process Control Typical a T + Data Acquisition System with Temperature Compensation +FS Error vs R at IN and IN SOURCE 2.7V TO 5.5V 80 V = 5V CC V = 5V REF 60 + V = 3.75V IN 0.1F 10F V CH0 V = 1.25V CC IN 40 f = GND CH1 O T = 25C A 20 + REF C = 1F IN 1.7k + IN 0 4-CHANNEL SDA 16-BIT ADC 2-WIRE MUX 2 20 WITH EASY-DRIVE I C INTERFACE SCL CH2 IN CH3 40 REF CA1 9-PIN SELECTABLE COM CA0 ADDRESSES 60 f O 80 OSC 1 10 100 1k 10k 100k R () SOURCE 2489 TA01a 2489 TA01b 2489fb 1 For more information www.linear.com/LTC2489 +FS ERROR (ppm) ion pplica ions pplica ion uresLTC2489 a Te Maxi Mu M r a T p in 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 LTC2489C ................................................ 0C to 70C 14-LEAD (4mm 3mm) PLASTIC DFN T = 125C, = 37C/W JMAX JA LTC2489I .............................................40C to 85C EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range .................. 65C to 150C o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2489CDE PBF LTC2489CDE TRPBF 2489 14-Lead (4mm 3mm) Plastic DFN 0C to 70C LTC2489IDE PBF LTC2489IDE TRPBF 2489 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: