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LTC2488IDE Datasheet(PDF) 1 Page - Linear Technology |
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LTC2488IDE Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC2488 1 2488f RSOURCE (Ω) 1 –20 0 20 1k 100k 2488 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 TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 16-Bit 2-/4-Channel ΔΣ ADC with Easy Drive Input Current Cancellation The LTC®2488 is a 4-channel (2-channel differential), 16- bit, No Latency ΔΣ™ ADC with Easy Drive™ technology. 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 LTC2488 includes an integrated oscillator. This device can be configured to measure an external signal from combinations of 4 analog input channels operating in single ended or differential modes. It automatically rejects line frequencies of 50Hz and 60Hz simultaneously. The LTC2488 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 selection is valid. Data Acquisition System , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No Latency ∆Σ and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Up to 2 Differential or 4 Single-Ended Inputs ■ Easy Drive Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current ■ Directly Digitizes High Impedance Sensors with Full Accuracy ■ 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 Fullscale Error vs Source Resistance SDI SCK SDO CS FO REF+ VCC 2.7V TO 5.5V 10 µF COM REF – 16-BIT ∆Σ ADC WITH EASY DRIVE 4-CHANNEL MUX IN+ IN– 2488 TA01a 4-WIRE SPI INTERFACE CH0 CH1 CH3 CH2 0.1 µF OSC |
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