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LTC2493CDETRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC2493CDETRPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC2493 2493fa Typical applicaTion FeaTures applicaTions DescripTion 24-Bit 2-/4-Channel DS ADC with Easy Drive Input Current Cancellation and I2C Interface TheLTC®2493isa4-channel(2-channeldifferential),24-bit, No Latency DSTM ADC with Easy Drive technology and a 2-wire,I2Cinterface.Thepatentedsamplingschemeelimi- nates 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 LTC2493 includes a high accuracy temperature sensor and an integrated oscillator. This device can be configured to measure an external signal (from combi- nations of 4 analog input channels operating in single- ended or differential modes) or its internal temperature sensor. The integrated temperature sensor offers 1/30th °C resolution and 2°C absolute accuracy. The LTC2493 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 en- ables optional external amplifiers to be shared between all analog inputs and auto calibration continuously removes their associated offset and drift. Data Acquisition System with Temperature Compensation ■ Up to 2 Differential or 4 Single-Ended Inputs ■ Easy DriveTM Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current ■ Directly Digitizes High Impedance Sensors with Full Accuracy ■ 2-Wire I2C Interface with 9 Addresses Plus One Global Address for Synchronization ■ 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/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 4mm × 3mm DFN Package ■ Direct Sensor Digitizer ■ Direct Temperature Measurement ■ Instrumentation ■ Industrial Process Control TEMPERATURE SENSOR SDA SCL FO REF+ VCC 2.7V TO 5.5V 0.1 µF COM REF– 24-BIT ∆Σ ADC WITH EASY-DRIVE 4-CHANNEL MUX IN+ IN– 2493 vTA01a 2-WIRE I2C INTERFACE 1.7k CA1 CA0 9-PIN SELECTABLE ADDRESSES CH0 CH1 CH3 CH2 10 µF OSC Integrated High Performance Temperature Sensor TEMPERATURE ( °C) –55 –30 –5 5 4 3 2 1 –4 –3 –2 –1 0 120 95 70 45 20 2493 TA02 –5 , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No Latency DS and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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