Selectable 250sps/1ksps 16-Bit ADC Integrates 10ppm/ºC Max Precision Reference

Dec 7 2009 -MILPITAS, CA
  • Linear Technology Corporation introduces the LTC2470 and LTC2472, a pair of 16-bit delta sigma ADCs that integrate a high accuracy reference in tiny 3mm × 3mm DFN and 12-lead MSOP packages. The device's integrated 1.25V reference offers 2ppm/ºC drift performance and 0.1% initial accuracy for precise measurements in space-constrained applications. Both ADCs provide guaranteed 16-bit no missing code resolution and selectable 250sps or 1ksps output rate. The LTC2470 and LTC2472 are ideal for system and environmental monitoring and data acquisition systems requiring fast output rates.


    Operating from a single 2.7V to 5.5V supply, these ADCs are designed to measure single-ended (LTC2470) or differential (LTC2472) sensors via an SPI serial interface. With its internal 1.25V reference, the LTC2470 can measure a single-ended input between 0V and 1.25V, while the LTC2472 is capable of measuring a differential input up to ±1.25V.


    The versatile LTC2470/LTC2472 achieve excellent 16-bit DC performance of 2LSB (typ) integral nonlinearity error at 250sps, 3µVRMS transition noise and 0.25% gain error (max). An internal oscillator eliminates the need for external components to perform conversions.


    The LTC2470/LTC2472 draw 3.5mA supply current during a conversion. After each conversion, the ADC enters a nap mode, reducing supply current to less than 1.5mA (max). Supply current can be further reduced by placing the converter in sleep mode to achieve less than 2µA(max). The LTC2470/LTC2472 also incorporate a proprietary input sampling network that reduces the dynamic input current to less than 50nA, making a wide range of external input protection and filter circuits possible.


    The LTC2470 and LTC2472 are each offered in small 12-pin 3mm × 3mm DFN and MSOP packages. They are available today in both commercial and industrial temperature grade versions. Pricing for the LTC2470 & LTC2472 begin at $1.70 each in 1,000-piece quantities. For more information, visit www.linear.com.


    Ultra-Tiny ADC Family
    Part Number Input Input Range Output Range I/O VREF
    LTC2450 Single-Ended 0V to VCC 30Hz SPI VCC = VREF
    LTC2450-1 Single-Ended 0V to VCC 60Hz SPI VCC = VREF
    LTC2451 Single-Ended 0V to VREF 60Hz I2C External
    LTC2452 Differential ±VREF 60Hz SPI External
    LTC2453 Differential ±VREF 60Hz I2C External
    LTC2460 Single-Ended 0V to VREF 60Hz SPI Internal
    LTC2461 Single-Ended 0V to VREF 60Hz I2C Internal
    LTC2462 Differential ±VREF 60Hz SPI Internal
    LTC2463 Differential ±VREF 60Hz I2C Internal
    LTC2470 Single-Ended 0V to VREF 250/1000Hz SPI Internal
    LTC2472 Differential ±VREF 250/1000Hz SPI Internal

    Summary of Features: LTC2470/LTC2472


    • 16-Bit Resolution, No Missing Codes
    • Internal Reference, (10ppm/ºC max)
    • Single-Ended (LTC2470) or Differential (LTC2472)
    • Selectable 250sps/1ksps Output Rate
    • 1mV Offset Error
    • 0.01% Gain Error
    • Single Conversion Settling Time for Multiplexed Applications
    • Single-Cycle Operation with Auto Shutdown:
      •  3.5mA (typ) Supply Current
      •  2µA (max) Sleep Current
    • Internal Oscillator—No External Components Required
    • SPI Interface
    • Small 12-Lead 3mm × 3mm DFN & MSOP Packages

    16-Bit ADC with Selectable 250sps/1ksps Output Rate & 10ppm/ºC Max Internal Reference
    LTC2470-72 PR Image

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