LTC2449
Info: : PRODUCTION
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LTC2449

24-Bit High Speed 8-/16-Channel ∆∑ ADCs with Selectable Speed/Resolution

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $9.39
Features
  • Up to 8 Differential or 16 Single-Ended Input Channels
  • Up to 8kHz Output Rate
  • Up to 4kHz Multiplexing Rate
  • Selectable Speed/Resolution
  • 2µVRMS Noise at 1.76kHz Output Rate
  • 200nVRMS Noise at 13.8Hz Output Rate with Simultaneous 50/60Hz Rejection
  • Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions
  • 0.0005% INL, No Missing Codes
  • Autosleep Enables 20µA Operation at 6.9Hz
  • <5µV Offset (4.5V < VCC < 5.5V, –40°C to 85°C)
  • Differential Input and Differential Reference with GND to VCC Common Mode Range
  • No Latency Mode, Each Conversion is Accurate Even After a New Channel is Selected
  • Internal Oscillator-No External Components
  • LTC2445/LTC2449 Include MUXOUT/ADCIN for External Buffering or Gain
  • Tiny QFN 5mm x 7mm Package
Additional Details
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The LTC2444/LTC2445/LTC2448/LTC2449 are 8-/16- channel (4-/8-differential) high speed 24-bit No Latency ∆∑ ADCs. They use a proprietary delta-sigma architecture enabling variable speed/resolution. Through a simple 4-wire serial interface, ten speed/resolution combinations 6.9Hz/280nVRMS to 3.5kHz/25µVRMS (4kHz with external oscillator) can be selected with no latency between conversion results or shift in DC accuracy (offset, full-scale, linearity, drift). Additionally, a 2X speed mode can be selected enabling output rates up to 7kHz (8kHz if an external oscillator is used) with one cycle latency.

Any combination of single-ended or differential inputs can be selected with a common mode input range from ground to VCC, independent of VREF. While operating in the 1X speed mode the first conversion following a new speed, resolution, or channel selection is valid. Since there is no settling time between conversions, all 8 differential channels can be scanned at a rate of 500Hz. At the conclusion of each conversion, the converter is internally reset eliminating any memory effects between successive conversions and assuring stability of the high order delta-sigma modulator.

Applications

  • High Speed Multiplexing
  • Weight Scales
  • Auto Ranging 6-Digit DVMs
  • Direct Temperature Measurement
  • High Speed Data Acquisition
Part Models 4
1ku List Price Starting From $9.39

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC2449CUHF#PBF
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LTC2449CUHF#TRPBF
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LTC2449IUHF#PBF
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LTC2449IUHF#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

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Evaluation Kit

Evaluation Kits 2

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DC1410A-B

LTC2449 Demo Board | Load Cell Digitizer Application, Requires DC2026C

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DC1410A-B

LTC2449 Demo Board | Load Cell Digitizer Application, Requires DC2026C

LTC2449 Demo Board | Load Cell Digitizer Application, Requires DC2026C

Product Detail

Demonstration circuit 1410A shows a compact, high resolution solution for measuring Wheatstone bridge type sensors for load, pressure, temperature, acceleration, and many other physical quantities.


Assembly type B features the LTC2449, an 8-/16-channel, high speed, 24-bit ΔΣ ADC with ten selectable speed/resolution modes from 6.9Hz/200nVRMS to 3.5kHz/23μVRMS (4kHz with external oscillator). Key DC specifications include 5ppm INL, 5μV offset, 10ppm full-scale error and 20nV/°C offset drift. In the 6.9Hz/200nVRMS mode, input normal mode rejection of 50Hz and 60Hz noise is better than 80dB.

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DC742B

LTC2449UHF Demo Board | 24-Bit High-Speed 8/16-Channel Delta Sigma ADC (Requires DC2026)

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DC742B

LTC2449UHF Demo Board | 24-Bit High-Speed 8/16-Channel Delta Sigma ADC (Requires DC2026)

LTC2449UHF Demo Board | 24-Bit High-Speed 8/16-Channel Delta Sigma ADC (Requires DC2026)

Product Detail

Demonstration circuit 742B features the LTC2449, an 8-/16-channel, high speed, 24-bit ΔΣ ADC with ten selectable speed/resolution modes from 6.9Hz/200nVRMS to 3.5kHz/25μVRMS (4kHz with external oscillator). Key DC specifications include 5ppm INL, 5μV offset, 10ppm fullscale error and 20nV/°C offset drift. In the 6.9Hz/200nVRMS mode, input normal mode rejection of 50Hz and 60Hz noise is better than 87dB. The accuracy (offset, full-scale, linearity, drift) and power dissipation are independent of the speed selected. The LTC2449 performs auto-zeroing of the ADC by reversing the inputs through the multiplexer output/ADC input connections. This allows an external dual buffer amplifier to isolate the signal inputs from the sampling current of the ADC.

Tools & Simulations

Tools & Simulations 1

Linduino

Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

Linduino code repository on GitHub and instructions on how to use the code.

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