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

Features

  • Click Here for LTC2492 Evaluation Kits
  • 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

LTC2492
LTC2492
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Description

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.

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Packaging

DFN-14

LTC2492
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC2492CDE#PBF DFN 14 C $4.32 $2.95 View
LTC2492CDE#TRPBF DFN 14 C $4.38 $3.01 View
LTC2492IDE#PBF DFN 14 I $5.18 $3.54 View
LTC2492IDE#TRPBF DFN 14 I $5.24 $3.60 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number Description Price
DC1009A-A LTC2492 24-bit, 2-ch ADC, req. DC590 $50.00
DC590B none | USB Serial Controller $50.00
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Applications

  • Direct Sensor Digitizer
  • Direct Temperature Measurement
  • Instrumentation
  • Industrial Process Control
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Simulate

Linear Technology offers free software and demo boards that greatly simplify the task of testing and evaluating our data converters. To use these powerful tools with this product:

  • Download the QuickEval System software. The QuickEval System is a USB-based product demonstration and data acquisition system for use with Linear Technology’s A/D, D/A, LED drivers and Powered Ethernet Controllers. The software also includes web links to the appropriate device data sheets and provides an automatic update feature to keep the software current with the latest set of device drivers.

  • Request the DC590 USB Data Acquisition Controller either online or from your local sales representative. The DC590 interfaces with the USB port of your computer and connects to daughter cards for specific Linear Technology data converters.

  • Request the evaluation kit for the LTC2492 (DC1009A-A) from your local sales representative. This daughter card interfaces with the DC590 and, along with the QuickEval software package, allows easy evaluation of the part from your PC.
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