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LTC2498 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2498 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC2498 1 2498fc FEATURES APPLICATIONS DESCRIPTION 24-Bit 8-/16-Channel ΔΣ ADC with Easy Drive Input Current Cancellation The LTC®2498 is a 16-channel (8-differential) 24-bit No Latency ΔΣ™ ADC with Easy Drive technology. The pat- ented 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 LTC2498 includes a high accuracy temperature sensor and an integrated oscillator. This device can be configured to measure an external signal (from combinations of 16 analog input channels operating in single ended or dif- ferential modes) or its internal temperature sensor. The integrated temperature sensor offers 1/30th °C resolution and 2°C absolute accuracy. The LTC2498 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 analog inputs and auto calibration continuously removes their associated offset and drift. Data Acquisition System with Temperature Compensation n Up to 8 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 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 Mode (15Hz Using Internal Oscillator) 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 QFN 5mm × 7mm Package n Direct Sensor Digitizer n Direct Temperature Measurement n Instrumentation n Industrial Process Control Absolute Temperature Error L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Δ∑ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. SDI SCK SDO CS FO REF+ VCC MUXOUT/ ADCIN MUXOUT/ ADCIN 2.7V TO 5.5V 0.1μF COM REF– 24-BIT ΔΣ ADC WITH EASY-DRIVE 16-CHANNEL MUX TEMPERATURE SENSOR IN+ IN– 2498 TA01a 4-WIRE SPI INTERFACE CH0 CH1 • • • • • • CH7 CH8 CH15 10μF OSC TEMPERATURE (°C) –55 –30 –5 5 4 3 2 1 –4 –3 –2 –1 0 120 95 70 45 20 2498 TA01b –5 TYPICAL APPLICATION |
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