Features

• Easy Drive Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current
• Directly Digitizes High Impedance Sensors with Full Accuracy
• 600nV_RMS Noise
• GND to V_CC Input/Reference Common Mode Range
• Programmable 50Hz, 60Hz or Simultaneous
•  /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

Typical Application

Description

The LTC®2484 combines a 24-bit No Latency ΔΣ™ analogto- digital converter with patented Easy Drive™ 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 V_CC) independent of the reference voltage. The reference can be as low as 100mV or can be tied directly to V_CC. 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.