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LTC2495 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2495 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC2495 1 2495f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 16-Bit 8-/16-Channel ΔΣ ADC with PGA, Easy Drive and I2C Interface The LTC®2495 is a 16-channel (eight differential), 16-bit, No Latency ΔΣTM ADC with Easy Drive technology and a 2-wire, I2C interface. The patented sampling scheme elimi- nates 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 LTC2495 includes programmable gain, a high accuracy temperature sensor, and an integrated oscillator. This device can be configured to measure an external signal (from com- binations of 16 analog input channels operating in single- ended or differential modes) or its internal temperature sensor. The integrated temperature sensor offers 1/2°C resolution and 2°C absolute accuracy. The LTC2495 can be configured to provide a programmable gain from 1 to 256 in 8 steps. The LTC2495 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 en- ables 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 Eight Differential or 16 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 27 Addresses Plus One Global Address for Synchronization ■ 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/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 5mm × 7mm QFN Package ■ Direct Sensor Digitizer ■ Direct Temperature Measurement ■ Instrumentation ■ Industrial Process Control Built-In High Performance Temperature Sensor , 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. SCL SDA FO REF+ VCC MUXOUT/ ADCIN MUXOUT/ ADCIN 2.7V TO 5.5V 10 µF 1.7k COM REF – 16-BIT ∆Σ ADC WITH EASY DRIVE 16-CHANNEL MUX TEMPERATURE SENSOR IN+ IN– 2495 TA01 2-WIRE I2C INTERFACE CH0 CH1 • • • • • • CH7 CH8 CH15 0.1 µF OSC TEMPERATURE ( °C) –55 –30 –5 5 4 3 2 1 –4 –3 –2 –1 0 120 95 70 45 20 2495 TA02 –5 |
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