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LTC2485, 24-Bit ΔΣ Analog-to-Digital Converter (ADC) Linear


Linear Technology’s ADCs for weight scales, test, and measurement applications

LTC’s LTC2485 combines a 24-bit plus sign No Latency ΔΣ™ analog-to-digital converter with patented Easy Drive technology 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. This ADC includes an on-chip oscillator and can be configured through an I2C interface to reject line frequencies. The LTC2485 allows a wide common mode input range (0 V to VCC) independent of the reference voltage. The reference can be as low as 100 mV or can be tied directly to VCC. The ADC includes an on-chip trimmed oscillator eliminating the need for external crystals or oscillators. Absolute accuracy and low drift are automatically maintained through continuous, transparent, offset, and full-scale calibration. This device comes in 10-pin DFN package and has two temperature ranges to choose from: 0°C to +70°C and -40°C to +85°C. The LTC2485 is perfect for weight scales, test, and measurement applications.

Features    
  • Easy Drive™ technology enables rail-to-rail inputs
  • Directly digitizes high impedance sensors with full accuracy
  • GND to VCC input/reference common mode range
  • 2-wire I2C interface
  • Programmable 50 Hz, 60 Hz or simultaneous 50 Hz / 60 Hz rejection mode
 
  • Sigma-delta
  • Voltage supply analog: 2.7 V to 5.5 V
  • Voltage supply digital: 2.7 V to 5.5 V
  • Temperature operating range: 0°C to +70°C
  • Package/case: 10-DFN (3 x 3)
Applications    
  • Weight scales
  • Test and measurement
  • Direct sensor digitizers
  • Direct temperature measurement
 
  • Strain gauge transducers
  • Instrumentation
  • Industrial process controls
  • DVMs and meters