LTC2492 - 24-Bit 2-/4-Channel Delta Sigma ADC with Easy Drive Input Current Cancellation

The LTC2492 is a 4-channel (2-channel differential), 24-bit, No Latency ΔΣ ADC with Easy Drive technology. 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 rail-to-rail input signals to be directly digitized while maintaining exceptional DC accuracy.

The LTC2492 includes a high accuracy temperature sensor and an integrated oscillator. This device can be configured to measure an external signal (from combinations of 4 analog input channels operating in single-ended or differential modes) or its internal temperature sensor. It can be programmed to reject line frequencies of 50Hz, 60Hz, or simultaneous 50Hz/60Hz and configured to double its output rate. The integrated temperature sensor offers 1/30th°C resolution and 2°C absolute accuracy.

The LTC2492 allows a wide common mode input range (0V to VCC), independent of the reference voltage. Any combination of single-ended or differential inputs can be selected and the first conversion after a new channel selection is valid.

  • Up to 2 Differential or 4 Single-Ended Inputs
  • Easy Drive™ Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current
  • Directly Digitizes High Impedance Sensors with Full Accuracy
  • 600nVRMS Noise
  • Integrated High Accuracy 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 Full-Scale Error
  • 2x Speed Mode/Reduced Power Mode (15Hz Using Internal Oscillator and 80μA at 7.5Hz Output)
  • No Latency: Digital Filter Settles in a Single Cycle, Even After a New Channel is Selected
  • Single Supply 2.7V to 5.5V Operation (0.8mW)
  • Internal Oscillator
  • Tiny DFN 4mm × 3mm Package
Typical Application

  • Direct Sensor Digitizer
  • Direct Temperature Measurement
  • Instrumentation
  • Industrial Process Control
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2492CDE#PBF4x3 DFN-14C$4.32$2.95
LTC2492CDE#TRPBF4x3 DFN-14C$4.38$3.01
LTC2492IDE#PBF4x3 DFN-14I$5.18$3.54
LTC2492IDE#TRPBF4x3 DFN-14I$5.24$3.60
Demo Boards
Part NumberDescriptionPrice
DC1009A-ALTC2492 24-bit, 2-ch ADC, req. DC590$50.00
Companion Boards
Part NumberDescriptionPrice
DC590BIsolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards$50.00
Design Note
Reliability Data
Product Selector Card
LT Journal
Press Release
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R461 Reliability Data
No Latency Delta-Sigma™ ADCs
Ultra-Tiny 16-Bit ΔΣ ADC Family
Mar 2007 - Easy Drive Delta-Sigma ADCs Deliver Powerful Features and Reduce Design Effort
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LTC2492 Footprints and Symbols