LTC2484 24-Bit ADC with Easy Drive Input Current Cancellation Fea T Descrip T n Easy Drive Technology Enables Rail-to-Rail Inputs The LTC 2484 combines a 24-bit No Latency analog- with Zero Differential Input Current to-digital converter with patented Easy Drive technology. n Directly Digitizes High Impedance Sensors with The patented sampling scheme eliminates dynamic input Full Accuracy current errors and the shortcomings of on-chip buffering n 600nV Noise through automatic cancellation of differential input current. RMS n GND to V Input/Reference Common Mode Range This allows large external source impedances and input CC n Programmable 50Hz, 60Hz or Simultaneous signals with rail-to-rail input range to be directly digitized 50Hz/60Hz Rejection Mode while maintaining exceptional DC accuracy. n 2ppm INL, No Missing Codes The LTC2484 includes an on-chip oscillator. The LTC2484 n 1ppm Offset and 15ppm Total Unadjusted Error can be configured to reject line frequencies. 50Hz, 60Hz n Selectable 2 Speed Mode (15Hz Using Internal or simultaneous 50Hz/60Hz line frequency rejection can Oscillator) be selected as well as a 2 speed-up mode. n No Latency: Digital Filter Settles in a Single Cycle n The LTC2484 allows a wide common mode input range Single Supply 2.7V to 5.5V Operation n (0V to V ) independent of the reference voltage. The Internal Oscillator CC n reference can be as low as 100mV or can be tied directly Available in a Tiny (3mm 3mm) 10-Lead to V . The LTC2484 includes an on-chip trimmed oscil- DFN Package CC lator, eliminating the need for external crystals or oscil- lators. Absolute accuracy and low drift are automatically a T maintained through continuous, transparent, offset and n Direct Sensor Digitizer full-scale calibration. n Weight Scales L, LT, LTC and 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. Patents pending. n Strain Gauge Transducers n Instrumentation n Industrial Process Control n DVMs and Meters + Typical a T +FS Error vs R at IN and IN SOURCE 80 V = 5V CC V CC V = 5V REF 60 + V = 3.75V IN V = 1.25V IN 40 1F 0.1F f = GND O T = 25C A 20 SDI C = 1F 10k I = 0 V V IN DIFF REF CC + V 0 IN SDO 4-WIRE SENSE LTC2484 20 SCK SPI INTERFACE V IN CS 40 GND f 10k O 2484 TA01 0.1F 60 80 1 10 100 10k 100k 1k R () 2484 TA02 SOURCE 2484ff 1 For more information www.linear.com/LTC2484 +FS ERROR (ppm) ion pplica ions pplica ion uresLTC2484 a T e Maxi Mu M r a T p c F T (Note 1) TOP VIEW Supply Voltage (V ) to GND ...................... 0.3V to 6V CC SDI 10 f Analog Input Voltage to GND ....... 0.3V to (V + 0.3V) 1 O CC V 2 9 SCK CC Reference Input Voltage to GND .. 0.3V to (V + 0.3V) CC 11 V 3 8 GND REF GND Digital Input Voltage to GND ........ 0.3V to (V + 0.3V) + CC IN 4 7 SDO Digital Output Voltage to GND ...... 0.3V to (V + 0.3V) IN 5 6 CS CC Operating Temperature Range DD PACKAGE LTC2484C ............................................... 0C to 70C 10-LEAD (3mm 3mm) PLASTIC DFN LTC2484I ...........................................40C to 85C T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range ................. 65C to 125C o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2484CDD PBF LTC2484CDD TRPBF LBSS 10-Lead (3mm 3mm) Plastic DFN 0C to 70C LTC2484IDD PBF LTC2484IDD TRPBF LBSS 10-Lead (3mm 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. For more information on lead free part marking, go to: