LTC2486

Features:

Up to 2 Differential or 4 Single-Ended Inputs
Easy Drive Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current
Directly Digitizes High Impedance Sensors with Full Accuracy
600nV RMS Noise
Programmable Gain from 1 to 256
Integrated High Accuracy Temperature Sensor
GND to V_CC 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 Mode/Reduced Power Mode (15Hz Using Internal Oscillator and 80A 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 4mm * 3mm DFN Package


Application

Direct Sensor Digitizer
Direct Temperature Measurement
Instrumentation
Industrial Process Control


Pinout




Specifications

Supply Voltage (V_CC) ..................................... 0.3V to 6V
Analog Input Voltage
  (CH0 to CH3, COM) .....................................0.3V to (V_CC+ 0.3V)
  REF⁺, REF .................................................0.3V to (V_CC+ 0.3V)
Digital Input Voltage .....................................0.3V to (V_CC+ 0.3V)
Digital Output Voltage ..................................0.3V to (V_CC+ 0.3V)
Operating Temperature Range
  LTC2486C .................................................. 0°C to 70°C
  LTC2486I ................................................... 40°C to 85°C
Storage Temperature Range ....................... 65°C to 150°C


Description

The LTC^®2486 is a 4-channel (2-channel differential), 16-bit, No Latency ™ ADC with 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 rail-torail input signals to be directly digitized while maintaining exceptional DC accuracy.

The LTC2486 includes programmable gain, a high accuracy temperature sensor, and an integrated oscillator. This device can be confi gured to measure an external signal (from combinations of 4 analog input channels operating in single ended or differential modes) or its internal temperature sensor. It can be programmed to reject line frequencies of 50Hz, 60Hz, or simultaneous 50Hz/60Hz, provide a programmable gain from 1 to 256 in 8 steps, and confi gured to double its output rate. The integrated temperature sensor offers 1/2°C resolution and 2°C absolute accuracy.

The LTC2486 allows a wide common mode input range (0V to V_CC), independent of the reference voltage. Any combination of single-ended or differential inputs can be selected and the fi rst conversion after a new channel selection is valid.