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LTC2489IDE#PBF

製品説明
仕様・特性

LTC2489 16-Bit 2-/4-Channel DΣ ADC with Easy Drive Input Current Cancellation and I2C Interface Description Features 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 V CC 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 n Applications Direct Sensor Digitizer Direct Temperature Measurement n Instrumentation n Industrial Process Control n n 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 analog inputs and auto calibration continuously removes their associated offset and drift. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Easy Drive and No Latency ∆Σ are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application +FS Error vs RSOURCE at IN+ and IN– Data Acquisition System with Temperature Compensation 2.7V TO 5.5V CH3 COM 4-CHANNEL MUX IN+ REF+ 1.7k REF– SDA SCL 2-WIRE I2C INTERFACE CA1 CA0 16-BIT ∆Σ ADC WITH EASY-DRIVE IN– 10µF 9-PIN SELECTABLE ADDRESSES fO OSC 2489 TA01a +FS ERROR (ppm) 0.1µF VCC CH0 CH1 CH2 80 VCC = 5V 60 VREF = 5V VIN+ = 3.75V VIN– = 1.25V 40 fO = GND 20 TA = 25°C CIN = 1µF 0 –20 –40 –60 –80 1 10 100 1k RSOURCE (Ω) 10k 100k 2489 TA01b 2489fb For more information www.linear.com/LTC2489 1

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