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LTC2489

Part Number	LTC2489
Manufacturer	Linear Technology
Description	16-Bit 2-/4-Channel ADC
Published	Jul 9, 2008
Detailed Description	LTC2489 16-Bit 2-/4-Channel DΣ ADC with Easy Drive Input Current Cancellation and I2C Interface Features Description ...
Datasheet	LTC2489 PDF File

Overview

LTC2489 16-Bit 2-/4-Channel DΣ ADC with Easy Drive Input Current Cancellation and I2C Interface Features Description n Up to 2 Differential or 4 Single-Ended Inputs n Easy DriveTM 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 (0.
02LSB Transition Noise) n GND to VCC Input/Reference Common Mode Range n Simultaneous 50Hz/60Hz Rejection n 2ppm INL, No Missing Codes n 1ppm Offset and 15ppm Full-Scale Error 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®2489 is a 4-channel (2-channel differential), 16-bit, No Latency DS™ 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 exceptional DC accuracy.
The LTC2489 includes an integrated oscillator.
This device can be configured to measure an external signal from combinations of 4 analog input channels operating in singleended or differential modes.
It automatically rejects line frequencies of 50Hz and 60Hz simultaneously.
The LTC2489 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 is selected, is valid.
Access to the multiplexer output enables optional external amplifiers to be shared between all an...

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