Datasheet LTC2483 (Analog Devices)

LTC2483 16-Bit ∆Σ ADC with Easy Drive Input Current Cancellation and I2C Interface FeaTures DescripTion n
Easy Drive™ Technology Enables Rail-to-Rail
The LTC® 2483 combines a 16-bit plus sign No Latency
Inputs with Zero Differential Input Current
∆∑™ analog-to-digital converter with patented Easy Drive n
Directly Digitizes High Impedance Sensors with
technology and I2C digital interface. The patented sampling
Full Accuracy
scheme eliminates dynamic input current errors and the n
600nV
shortcomings of on-chip buffering through automatic
RMS Noise, Independent of VREF
n
GND to V
cancellation of differential input current. This allows large
CC Input/Reference Common Mode Range
n
2-Wire I2C Interface
external source impedances and input signals, with rail-to- n Simultaneous 50Hz/60Hz Rejection rail input range to be directly digitized while maintaining n 2ppm (0.25 LSB) INL, No Missing Codes exceptional DC accuracy. n 1ppm Offset and 15ppm Full-Scale Error The LTC2483 allows a wide common mode input range n No Latency: Digital Filter Settles in a Single Cycle (0V to VCC) independent of the reference voltage. The n Single Supply 2.7V to 5.5V Operation reference can be as low as 100mV or can be tied directly n Internal Oscillator to VCC. The noise level is 600nVRMS independent of VREF. n Six Addresses Available This allows direct digitization of low level signals with n Available in a Tiny (3mm × 3mm) 10-Lead 16-bit accuracy. The LTC2483 includes an on-chip trimmed DFN Package oscillator, eliminating the need for external crystals or oscillators and provides 87dB rejection of 50Hz and 60Hz applicaTions line frequency noise. Absolute accuracy and low drift are n Direct Sensor Digitizer automatical y maintained through continuous, transparent, n Weight Scales offset and full-scale calibration. n Direct Temperature Measurement L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Strain Gauge Transducers No Latency ∆∑ and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents pending. n Instrumentation n Industrial Process Control n DVMs and Meters Typical applicaTion
+FS Error vs RSOURCE at IN+ and IN–
80 V V CC = 5V CC 60 VREF = 5V V + IN = 3.75V – 1µF V = 1.25V 0.1µF 40 IN FO = GND 20 TA = 25°C 10k SCL IDIFF = 0 REF+ VCC 2-WIRE CIN = 1µF V + IN SDA I2C INTERFACE 0 SENSE LTC2483 CA0/F0 –20 6 ADDRESSES V – +FS ERROR (ppm) IN CA1 10k GND REF– –40 0.1µF 2483 TA01 –60 –80 1 10 100 1k 10k 100k RSOURCE (Ω) 2483 TA02 2483fc Document Outline Features Applications Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Converter Characteristics Analog Input and Reference I2C Digital Inputs and Digital Outputs Power Requirements Timing Characteristics I2C Timing Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Revision History Typical Application Related Parts