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LTC2493 Dataheets PDF



Part Number LTC2493
Manufacturers Linear Technology
Logo Linear Technology
Description 24-Bit 2-/4-Channel ADC
Datasheet LTC2493 DatasheetLTC2493 Datasheet (PDF)

LTC2493 Features 24-Bit 2-/4-Channel ∆∑ ADC with Easy Drive Input Current Cancellation and I2C Interface Description n Up to 2 Differential or 4 Single-Ended Inputs n Easy Drive™ 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 n Integrated High Accuracy Temperature Sensor n GND to VCC Input/Refer.

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LTC2493 Features 24-Bit 2-/4-Channel ∆∑ ADC with Easy Drive Input Current Cancellation and I2C Interface Description n Up to 2 Differential or 4 Single-Ended Inputs n Easy Drive™ 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 n Integrated High Accuracy Temperature Sensor n GND to VCC Input/Reference Common Mode Range n Programmable 50Hz, 60Hz or Simultaneous 50Hz/60Hz Rejection Mode n 2ppm INL, No Missing Codes n 1ppm Offset and 15ppm Full-Scale Error n 2× Speed/Reduced Power Mode (15Hz Using Internal Oscillator and 80µA at 7.5Hz Output) 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 Applications n Direct Sensor Digitizer n Direct Temperature Measurement n Instrumentation n Industrial Process Control The LTC®2493 is a 4-channel (2-channel differential), 24-bit, No Latency ∆∑™ 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 LTC2493 includes a high accuracy temperature sensor and 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) or its internal temperature sensor. The integrated temperature sensor offers 1/30th °C resolution and 2°C absolute accuracy. The LTC2493 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 No Latency ∆∑ and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application Data Acquisition System with Temperature Compensation 2.7V TO 5.5V CH0 CH1 CH2 CH3 COM 4-CHANNEL MUX TEMPERATURE SENSOR VCC 0.1µF 10µF IN+ REF+ 24-BIT ∆∑ ADC WITH EASY-DRIVE IN– REF – OSC SDA SCL CA1 CA0 fO 2493 vTA01a 1.7k 2-WIRE I2C INTERFACE 9-PIN SELECTABLE ADDRESSES Integrated High Performance Temperature Sensor ABSOLUTE ERROR (°C) 5 4 3 2 1 0 –1 –2 –3 –4 –5 –55 –30 –5 20 45 70 TEMPERATURE (°C) 95 120 2493 TA02 For more information www.linear.com/LTC2493 2493fe 1 LTC2493 Absolute Maximum Ratings (Notes 1, 2) Supply Voltage (VCC).................................... –0.3V to 6V Analog Input Voltage (CH0 to REF+, REF CH3, COM)................... –................................... – – 0.3V 0.3V to to (VCC (VCC + + 0.3V) 0.3V) Digital Input Voltage..................... –0.3V to (VCC + 0.3V) Digital Output Voltage................... –0.3V to (VCC + 0.3V) Operating Temperature Range LTC2493C................................................. 0°C to 70°C LTC2493I..............................................–40°C to 85°C Storage Temperature Range...................–65°C to 150°C Pin Configuration fO 1 CA0 2 CA1 3 SCL 4 SDA 5 GND 6 COM 7 14 REF – 13 REF+ 12 VCC 15 11 CH3 10 CH2 9 CH1 8 CH0 DE PACKAGE 14-LEAD (4mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 37°C/W EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2493CDE#PBF LTC2493CDE#TRPBF 2493 14-Lead (4mm × 3mm) Plastic DFN 0°C to 70°C LTC2493IDE#PBF LTC2493IDE#TRPBF 2493 14-Lead (4mm × 3mm) Plastic DFN –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 2493fe 2 For more information www.linear.com/LTC2493 LTC2493 E lectrical Characteristics (Normal Speed) The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3, 4) PARAMETER CONDITIONS MIN.


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