LTC2480 16-Bit ADC with Easy Drive Input Current Cancellation FEATURES DESCRIPTION n Extended Temperature Range of 40C to 125C The LTC 2480 combines a 16-bit plus sign No Latency n Easy Drive Technology Enables Rail-to-Rail Inputs analog-to-digital converter with patented Easy Drive with Zero Differential Input Current technology. The patented sampling scheme eliminates n Directly Digitizes High Impedance Sensors with dynamic input current errors and the shortcomings of on- Full Accuracy chip buffering through automatic cancellation of differential n Programmable Gain from 1 to 256 input current. This allows large external source impedances n GND to V Input/Reference Common Mode Range and input signals, with rail-to-rail input range to be directly CC n Programmable 50Hz, 60Hz or Simultaneous digitized while maintaining exceptional DC accuracy. 50Hz/60Hz Rejection Mode The LTC2480 includes on-chip programmable gain and n 2ppm (0.25LSB) INL, No Missing Codes an oscillator. The LTC2480 can be configured to provide a n 1ppm Offset and 15ppm Full-Scale Error programmable gain from 1 to 256 in 8 steps, measure an n Selectable 2x Speed Mode (15Hz Using Internal external signal or internal temperature sensor and reject Oscillator) line frequencies. 50Hz, 60Hz or simultaneous 50Hz/60Hz n No Latency: Digital Filter Settles in a Single Cycle line frequency rejection can be selected as well as a 2x n Single Supply 2.7V to 5.5V Operation speed-up mode. n Internal Oscillator n The LTC2480 allows a wide common mode input range Available in a Tiny (3mm 3mm) 10-Lead (0V to V ) independent of the reference voltage. The DFN Package and 10-Lead MSOP Package CC reference can be as low as 100mV or can be tied directly APPLICATIONS to V . The LTC2480 includes an on-chip trimmed oscil- CC lator eliminating the need for external crystals or oscil- n Direct Sensor Digitizer lators. Absolute accuracy and low drift are automatically n Weight Scales maintained through continuous, transparent, offset and n Direct Temperature Measurement full-scale calibration. n Strain Gauge Transducers L, LT, LTC and LTM, Linear Technology and the Linear logo are registered trademarks and n Instrumentation No Latency and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents pending. n Industrial Process Control n DVMs and Meters TYPICAL APPLICATION + +FS Error vs R at IN and IN SOURCE 80 V = 5V CC V V = 5V CC 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 LTC2480 20 SCK SPI INTERFACE V IN CS 40 10k GND f O 2480 TA01 0.1F 60 80 1 10 100 10k 100k 1k R () 2480 TA04 SOURCE 2480fe 1 For more information www.linear.com/LTC2480 +FS ERROR (ppm)LTC2480 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltage (V ) to GND ...................... 0.3V to 6V Operating Temperature Range CC Analog Input Voltage to GND ....... 0.3V to (V + 0.3V) LTC2480C ............................................... 0C to 70C CC Reference Input Voltage to GND .. 0.3V to (V + 0.3V) LTC2480I ............................................ 40C to 85C CC Digital Input Voltage to GND ........ 0.3V to (V + 0.3V) LTC2480H ........................................ 40C to 125C CC Digital Output Voltage to GND ...... 0.3V to (V + 0.3V) Storage Temperature Range .................. 65C to 125C CC PIN CONFIGURATION TOP VIEW TOP VIEW SDI 1 10 f O SDI 1 10 f V 2 9 SCK O CC 11 V 2 9 SCK CC V 3 8 GND REF GND V 3 8 GND REF + + IN 4 7 SDO IN 4 7 SDO IN 5 6 CS IN 5 6 CS MS PACKAGE 10-LEAD PLASTIC MSOP DD PACKAGE T = 125C, = 120C/W 10-LEAD (3mm 3mm) PLASTIC DFN JMAX JA T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2480CDD PBF LTC2480CDD TRPBF LBJY 10-Lead (3mm 3mm) Plastic DFN 0C to 70C LTC2480IDD PBF LTC2480IDD TRPBF LBJY 40C to 85C 10-Lead (3mm 3mm) Plastic DFN LTC2480CMS PBF LTC2480CMS TRPBF LTCWB 10-Lead Plastic MSOP 0C to 70C LTC2480IMS PBF LTC2480IMS TRPBF LTCWB 10-Lead Plastic MSOP 40C to 85C LTC2480HDD PBF LTC2480HDD TRPBF LBJY 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC2480HMS PBF LTC2480HMS TRPBF LTCWB 10-Lead Plastic MSOP 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. For more information on lead free part marking, go to: