Datasheet LTC2482 (Analog Devices)

LTC2482 16-Bit ΔΣ ADC with Easy Drive Input Current Cancellation
FEATURES DESCRIPTION
n
Easy Drive™ Technology Enables Rail-to-Rail
The LTC®2482 combines a 16-bit plus sign No Latency ΔΣ™
Inputs with Zero Differential Input Current
analog-to-digital converter with patented Easy Drive n
Directly Digitizes High Impedance Sensors with
technology. The patented sampling scheme eliminates
Full Accuracy
dynamic input current errors and the shortcomings of on- n
600nV RMS Noise, Independent of VREF
chip buffering through automatic cancellation of differential n
Operates with a Reference as Low as 100mV with
input current. This allows large external source impedances
16-Bit Resolution
and input signals with rail-to-rail input range to be directly n
GND to VCC Input/Reference Common Mode Range
digitized while maintaining exceptional DC accuracy. n Simultaneous 50Hz/60Hz Rejection Mode The LTC2482 allows a wide common mode input range n 2ppm INL, No Missing Codes (0V to V n 1ppm Offset and 15ppm Total Unadjusted Error CC) independent of the reference voltage. The reference can be as low as 100mV or can be tied directly n No Latency: Digital Filter Settles in a Single Cycle to V n Single Supply 2.7V to 5.5V Operation CC. The noise level is 600nV RMS independent of V n Internal Oscillator REF . This allows direct digitization of low level signals with 16-bit accuracy. The LTC2482 includes an on-chip n Available in a Tiny (3mm × 3mm) 10-Lead trimmed oscillator, eliminating the need for external crystals DFN Package or oscillators and provides 87dB rejection of 50Hz and
APPLICATIONS
60Hz line frequency noise. Absolute accuracy and low drift are automatically maintained through continuous, n Direct Sensor Digitizer transparent, offset and full-scale calibration. n Weight Scales L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Direct Temperature Measurement Technology Corporation. No Latency ΔΣ and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Strain Gauge Transducers n Instrumentation n Industrial Process Control n DVMs and Meters
TYPICAL APPLICATION +FS Error vs RSOURCE at IN+ and IN–
80 VCC VCC = 5V 60 VREF = 5V V + IN = 3.75V 0.1μF 1μF V – = 1.25V 40 IN fO = GND 20 TA = 25°C 10k I V DIFF = 0 REF VCC SDO V + C IN IN = 1μF SCK 0 3-WIRE SENSE LTC2482 SPI INTERFACE CS – –20 VIN +FS ERROR (ppm) 10k GND fO 2482 TA01 –40 0.1μF –60 –80 1 10 100 1k 10k 100k RSOURCE (Ω) 2482 TA02 2482fc 1