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LTC2485CDD Datasheet(PDF) 1 Page - Linear Technology |
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LTC2485CDD Datasheet(HTML) 1 Page - Linear Technology |
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1 / 40 page  1 LTC2485 2485fa ■ Direct Sensor Digitizer ■ Weight Scales ■ Direct Temperature Measurement ■ Strain Gauge Transducers ■ Instrumentation ■ Industrial Process Control ■ DVMs and Meters 24-Bit ∆Σ ADC with Easy Drive Input Current Cancellation and I2C Interface ■ Easy Drive TM Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current ■ Directly Digitizes High Impedance Sensors with Full Accuracy ■ Integrated Temperature Sensor ■ GND to VCC Input/Reference Common Mode Range ■ 2-Wire I2C Interface ■ Programmable 50Hz, 60Hz or Simultaneous 50Hz/60Hz Rejection Mode ■ 2ppm (0.25LSB) INL, No Missing Codes ■ 1ppm Offset and 15ppm Full-Scale Error ■ Selectable 2x Speed Mode ■ No Latency: Digital Filter Settles in a Single Cycle ■ Single Supply 2.7V to 5.5V Operation ■ Internal Oscillator ■ Six Addresses Available and One Global Address for Synchronization ■ Available in a Tiny (3mm × 3mm) 10-Lead DFN Package The LTC ®2485combinesa24-bitplussignNoLatency ∆ΣTM analog-to-digital converter with patented Easy Drive tech- nology and I2C digital interface. The patented sampling scheme eliminates dynamic input current errors and the shortcomings of on-chip buffering through automatic cancellation of differential input current. This allows large external source impedances and input signals, with rail-to- rail input range to be directly digitized while maintaining exceptional DC accuracy. The LTC2485 includes on-chip temperature sensor and an oscillator. The LTC2485 can be configured through an I2C interface to measure an external signal or internal tem- perature sensor and reject line frequencies. 50Hz, 60Hz or simultaneous 50Hz/60Hz line frequency rejection can be selected as well as a 2x speed-up mode. The LTC2485 allows a wide common mode input range (0V to VCC) independent of the reference voltage. The reference can be as low as 100mV or can be tied directly to VCC. The LTC2485 includes an on-chip trimmed oscil- lator eliminating the need for external crystals or oscilla- tors. Absolute accuracy and low drift are automatically maintained through continuous, transparent, offset and full-scale calibration. +FS Error vs RSOURCE at IN+ and IN– FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO LTC2485 VIN + REF+ VCC VCC GND VIN – 1 µF SDA 2-WIRE I2C INTERFACE 1 µF 10k IDIFF = 0 10k CA0/F0 2485 TA01 CA1 SCL 6 ADDRESSES REF– SENSE RSOURCE (Ω) 1 –20 0 20 1k 100k –40 –60 –80 10 100 10k 40 60 80 VCC = 5V VREF = 5V VIN + = 3.75V VIN – = 1.25V FO = GND TA = 25°C CIN = 1µF 2485 TA02 , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No Latency ∆Σ and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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