LTC2481 16-Bit ADC with Easy Drive Input Current Cancellation 2 and I C Interface FeaT DescripT n Easy Drive Technology Enables Rail-to-Rail Inputs The LTC 2481 combines a 16-bit plus sign No Latency with Zero Differential Input Current analog-to-digital converter with patented Easy Drive 2 n Directly Digitizes High Impedance Sensors with technology and I C digital interface. The patented sampling Full Accuracy scheme eliminates dynamic input current errors and the n Programmable Gain from 1 to 256 shortcomings of on-chip buffering through automatic n GND to V Input/Reference Common Mode Range cancellation of differential input current. This allows large CC 2 n 2-Wire I C Interface external source impedances and input signals, with rail-to- n Programmable 50Hz, 60Hz or Simultaneous rail input range to be directly digitized while maintaining 50Hz/60Hz Rejection Mode exceptional DC accuracy. n 2ppm (0.25LSB) INL, No Missing Codes The LTC2481 includes on-chip programmable gain and n 1ppm Offset and 15ppm Full-Scale Error an oscillator. The LTC2481 can be configured through an n Selectable 2x Speed Mode 2 I C interface to provide a programmable gain from 1 to n No Latency: Digital Filter Settles in a Single Cycle 256 in 8 steps, to digitize an external signal or internal n Single Supply 2.7V to 5.5V Operation temperature sensor, reject line frequencies (50Hz, 60Hz or n Internal Oscillator simultaneous 50Hz/60Hz) as well as a 2x speed-up mode. n Six Addresses Available and One Global Address for The LTC2481 allows a wide common mode input range Synchronization n (0V to V ) independent of the reference voltage. The Available in a Tiny (3mm 3mm) 10-Lead DFN Package CC reference can be as low as 100mV or can be tied directly Ta to V . The LTC2481 includes an on-chip trimmed oscil- CC n lator eliminating the need for external crystals or oscil- Direct Sensor Digitizer n lators. Absolute accuracy and low drift are automatically Weight Scales n maintained through continuous, transparent, offset and Direct Temperature Measurement n full-scale calibration. Strain Gauge Transducers n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Instrumentation No Latency and Easy Drive are trademarks of Linear Technology Corporation. n Industrial Process Control All other trademarks are the property of their respective owners. Patents Pending. n DVMs and Meters Typical Ta + +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 1F 40 0.1F f = GND O T = 25C A 20 SCL + 10k I = 0 REF V 2-WIRE C = 1F DIFF CC IN + 2 V 0 IN SDA I C INTERFACE SENSE LTC2481 CA0/f 20 0 6 ADDRESSES V IN CA1 40 10k GND REF 2481 TA01a 0.1F 60 80 1 10 100 10k 100k 1k R () 2481 TA01b SOURCE 2481fd 1 For more information www.linear.com/LTC2481 +FS ERROR (ppm) ion pplica ions pplica ion uresLTC2481 Ta e MaxiMMu Tar in p Fc T (Notes 1, 2) TOP VIEW Supply Voltage (V ) to GND ...................... 0.3V to 6V CC + Analog Input Voltage to GND ....... 0.3V to (V + 0.3V) REF 1 10 CA0/f CC 0 V 9 CA1 2 CC Reference Input Voltage to GND .. 0.3V to (V + 0.3V) CC REF 3 11 GND 8 Digital Input Voltage to GND ....... 0.3V to (V + 0.3V) CC + 4 IN 7 SDA Digital Output Voltage to GND ...... 0.3V to (V + 0.3V) CC IN 5 6 SCL Operating Temperature Range DD PACKAGE LTC2481C .................................................... 0C to 70C 10-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 43C/W LTC2481I .................................................40C to 85C JMAX JA EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB LTC2481H .............................................. 40C to 125C Storage Temperature Range ................. 65C to 125C Dro er Fni MTa LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2481CDD PBF LTC2481CDD TRPBF LBPV 10-Lead (3mm 3mm) Plastic DFN 0C to 70C LTC2481IDD PBF LTC2481IDD TRPBF LBPV 10-Lead (3mm 3mm) Plastic DFN 40C to 85C LTC2481HDD PBF LTC2481HDD TRPBF LBPV 40C to 125C 10-Lead (3mm 3mm) Plastic DFN 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: