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LTC2489 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2489 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LTC2489 1 2489f RSOURCE (Ω) 1 –20 0 20 1k 100k 2489 TA01b –40 –60 –80 10 100 10k 40 60 80 VCC = 5V VREF = 5V VIN + = 3.75V VIN – = 1.25V FO = GND TA = 25°C CIN = 1μF 16-Bit 2-/4-Channel ΔΣ ADC with Easy Drive Input Current Cancellation and I2C Interface TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION The LTC®2489 is a 4-channel (2-channel differential), 16-bit, No Latency ΔΣ™ ADC with Easy Drive technology and a 2-wire, I2C interface. The patented sampling scheme eliminates dynamic input current errors and the shortcom- ings 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 com- binations of 4 analog input channels operating in single- ended 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. 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 (0.02LSB Transition Noise) ■ GND to VCC Input/Reference Common Mode Range ■ Simultaneous 50Hz/60Hz Rejection ■ 2ppm INL, No Missing Codes ■ 1ppm Offset and 15ppm Full-Scale Error ■ 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 +FS Error vs RSOURCE at IN+ and IN– SDA SCL FO REF+ VCC 2.7V TO 5.5V 0.1 μF COM REF – 16-BIT ΔΣ ADC WITH EASY-DRIVE 4-CHANNEL MUX IN+ IN– 2489 TA01a 2-WIRE I2C INTERFACE 1.7k CA1 CA0 9-PIN SELECTABLE ADDRESSES CH0 CH1 CH3 CH2 10 μF OSC , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No Latency ΔΣ and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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