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24-Bit 2-/4-Channel Delta Sigma ADC with Easy Drive Input Current Cancellation
Linear Technology Inc.

Description
The LTC2492 is a 4-channel (2-channel differential), 24-bit, No LatencyDelta SigmaADC 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 fi rst conversion after a new channel selection is valid.
Features
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 600nV RMS 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




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