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LTC2499 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2499 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 34 page  LTC2499 1 2499fc FEATURES APPLICATIONS DESCRIPTION 24-Bit 8-/16-Channel ΔΣ ADC with Easy Drive Input Current Cancellation and I2C Interface The LTC®2499 is a 16-channel (eight differential), 24-bit, No Latency ΔΣ™ ADC with Easy Drive technology and a 2-wire, I2C interface. The patented sampling scheme elimi- 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 LTC2499 includes a high accuracy, temperature sensor and an integrated oscillator. This device can be configured to measure an external signal (from combi- nations of 16 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 LTC2499 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 n Up to Eight Differential or 16 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 27 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 2x 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 5mm × 7mm QFN Package n Direct Sensor Digitizer n Direct Temperature Measurement n Instrumentation n Industrial Process Control Integrated High Performance Temperature Sensor TYPICAL APPLICATION SCL SDA fO REF+ VCC MUXOUT/ ADCIN MUXOUT/ ADCIN 2.7V TO 5.5V 10μF 1.7k COM REF– 24-BIT ADC WITH EASY DRIVE 16-CHANNEL MUX TEMPERATURE SENSOR IN+ IN– 2499 TA01 2-WIRE I2C INTERFACE CH0 CH1 • • • • • • CH7 CH8 CH15 0.1μF OSC TEMPERATURE (°C) –55 –30 –5 5 4 3 2 1 –4 –3 –2 –1 0 120 95 70 45 20 2499 TA02 –5 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency Δ∑ and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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