24-Bit 2-/4-Channel ADC
LTC2493
Features
24-Bit 2-/4-Channel ∆∑ ADC with Easy Drive Input Current
Cancellation and I2C Interface Description
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Description
LTC2493
Features
24-Bit 2-/4-Channel ∆∑ ADC with Easy Drive Input Current
Cancellation and I2C Interface Description
n Up to 2 Differential or 4 Single-Ended Inputs n Easy Drive™ Technology Enables Rail-to-Rail
Inputs with Zero Differential Input Current n Directly Digitizes High Impedance Sensors with
Full Accuracy n 2-Wire I2C Interface with 9 Addresses Plus One
Global Address for Synchronization n 600nV RMS Noise n Integrated High Accuracy Temperature Sensor n GND to VCC Input/Reference Common Mode Range n Programmable 50Hz, 60Hz or Simultaneous
50Hz/60Hz Rejection Mode n 2ppm INL, No Missing Codes n 1ppm Offset and 15ppm Full-Scale Error n 2× Speed/Reduced Power Mode (15Hz Using Internal
Oscillator and 80µA at 7.5Hz Output) n No Latency: Digital Filter Settles in a Single Cycle,
Even After a New Channel Is Selected n Single Supply 2.7V to 5.5V Operation (0.8mW) n Internal Oscillator n Tiny 4mm × 3mm DFN Package
Applications
n Direct Sensor Digitizer n Direct Temperature Measurement n Instrumentation n Industrial Process Control
The LTC®2493 is a 4-channel (2-channel differential), 24-bit, No Latency ∆∑™ ADC with Easy Drive technology and a 2-wire, I2C interface. 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 exc...
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