Datasheet Linear Technology LTC2484CDD#TR
24-Bit ΔΣ ADC with Easy Drive Input Current Cancellation
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LTC2484 24-Bit ADC with Easy Drive Input Current Cancellation FeaTures DescripTion
The LTC®2484 combines a 24-bit No Latency TM analogto-digital converter with patented Easy DriveTM 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 input signals with rail-to-rail input range to be directly digitized while maintaining exceptional DC accuracy. The LTC2484 includes an on-chip oscillator. The LTC2484 can be configured to reject line frequencies. 50Hz, 60Hz or simultaneous 50Hz/60Hz line frequency rejection can be selected as well as a 2× speed-up mode. The LTC2484 allows a wide common mode input range (0V to VCC) independent of the reference voltage. The reference can be as low as 100mV or can be tied directly to VCC. The LTC2484 includes an on-chip trimmed oscillator, eliminating the need for external crystals or oscillators. Absolute accuracy and low drift are automatically maintained through continuous, transparent, offset and full-scale calibration.
L, LT, LTC and 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. Patents pending. n n Easy Drive Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current Directly Digitizes High Impedance Sensors with Full Accuracy 600nVRMS Noise 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 Total Unadjusted Error Selectable 2× Speed Mode (15Hz Using Internal Oscillator) No Latency: Digital Filter Settles in a Single Cycle Single Supply 2.7V to 5.5V Operation Internal Oscillator Available in a Tiny (3mm × 3mm) 10-Lead DFN Package applicaTions n Direct Sensor Digitizer Weight Scales Direct Temperature Measurement Strain Gauge Transducers Instrumentation Industrial Process Control DVMs and Meters Typical applicaTion
80 VCC 0.1µF 10k SENSE 10k VIN 0.1µF IDIFF = 0 VREF LTC2484 GND fO VCC 1µF SDI SDO SCK CS
2484 TA01 +FS Error vs RSOURCE at IN+ and IN
VCC = 5V 60 VREF = 5V VIN+ = 3.75V VIN = 1.25V 40 fO = GND 20 TA = 25°C 0 20 40 60 80 1 10 100 1k RSOURCE ( ) 10k 100k
2484 TA02 +FS ERROR (ppm) VIN+ CIN = 1µF 4-WIRE SPI INTERFACE For more information www.linear.com/LTC2484 1 2484ff LTC2484 absoluTe MaxiMuM raTings
(Note 1) pin conFiguraTion
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Data Conversion > Analog-to-Digital Converters (ADC) > No Latency Delta Sigma ADCs
Other Names: LTC2484CDDTR, LTC2484CDD TR
Docket:LTC2484 24-Bit ADC with Easy Drive Input Current Cancellation FeaTures DescripTion
The LTC®2484 combines a 24-bit No Latency TM analogto-digital converter with patented Easy DriveTM technology. The patented sampling scheme eliminates dynamic input current errors and the shortcomings of on-chip buffering through automatic cancellation of differential ...