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LTC2484CDD Datasheet(PDF) 1 Page - Linear Technology |
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LTC2484CDD Datasheet(HTML) 1 Page - Linear Technology |
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1 / 40 page  1 LTC2484 2484fa LTC2484 VREF VCC VCC GND FO 1 µF SDO 4-WIRE SPI INTERFACE 1 µF 10k IDIFF = 0 10k SCK 2484 TA01 CS SDI SENSE VIN + VIN – ■ Direct Sensor Digitizer ■ Weight Scales ■ Direct Temperature Measurement ■ Strain Gauge Transducers ■ Instrumentation ■ Industrial Process Control ■ DVMs and Meters ■ Easy Drive Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current ■ Directly Digitizes High Impedance Sensors with Full Accuracy ■ 600nV RMS Noise ■ Integrated Temperature Sensor ■ GND to VCC Input/Reference Common Mode Range ■ Programmable 50Hz, 60Hz or Simultaneous 50Hz/60Hz Rejection Mode ■ 2ppm INL, No Missing Codes ■ 1ppm Offset and 15ppm Total Unadjusted Error ■ Selectable 2x Speed Mode (15Hz Using Internal Oscillator) ■ No Latency: Digital Filter Settles in a Single Cycle ■ Single Supply 2.7V to 5.5V Operation ■ Internal Oscillator ■ Available in a Tiny (3mm × 3mm) 10-Lead DFN Package FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO The LTC ®2484 combines a 24-bit No Latency ∆Σ™analog- to-digital converter with patented Easy Drive™ technol- ogy. 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 LTC2484 includes an on-chip temperature sensor and oscillator. The LTC2484 can be configured to measure an external signal or internal temperature 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 LTC2484 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 LTC2484 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. RSOURCE (Ω) 1 –20 0 20 1k 100k 2484 TA02 –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 +FS Error vs RSOURCE at IN+ and IN– 24-Bit ∆Σ ADC with Easy Drive Input Current Cancellation , 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. Patent pending. |
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