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LTC2486IDE Datasheet(PDF) 1 Page - Linear Technology |
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LTC2486IDE Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC2486 1 2486f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 16-Bit 2-/4-Channel ΔΣ ADC with PGA and Easy Drive Input Current Cancellation The LTC ®2486 is a 4-channel (2-channel differential), 16-bit, No Latency ΔΣ™ADCwithEasyDrive™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 LTC2486 includes programmable gain, a high accuracy temperature sensor, and an integrated oscillator. This de- vice can be configured to measure an external signal (from combinations of 4 analog input channels operating in single ended or differential modes) or its internal temperature sen- sor. It can be programmed to reject line frequencies of 50Hz, 60Hz,orsimultaneous50Hz/60Hz,provideaprogrammable gain from 1 to 256 in 8 steps, and configured to double its output rate. The integrated temperature sensor offers 1/2°C resolution and 2°C absolute accuracy. The LTC2486 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 with Temperature Compensation , 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 ■ Programmable Gain from 1 to 256 ■ Integrated High Accuracy Temperature Sensor ■ GND to VCC Input/Reference Common Mode Range ■ Programmable 50Hz, 60Hz, or Simultaneous 50Hz/60Hz Rejection Mode ■ 2ppm INL, No Missing Codes ■ 1ppm Offset and 15ppm Full-Scale Error ■ 2x Speed Mode/Reduced Power Mode (15Hz Using Internal Oscillator and 80µA at 7.5Hz Output) ■ 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 Absolute Temperature Error 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 TEMPERATURE SENSOR IN+ IN– 2486 TA01a 4-WIRE SPI INTERFACE CH0 CH1 CH3 CH2 0.1 µF OSC TEMPERATURE ( °C) –55 –30 –5 5 4 3 2 1 –4 –3 –2 –1 0 120 95 70 45 20 2486 TA01b –5 |
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