LTC2486CDE#PBF Integrated Circuit Chip 16-Bit 2-/4-Channel ADC with PGA

16-Bit 2-/4-Channel ΔΣ ADC with PGA and Easy Drive Input Current Cancellation

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 VCC 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 80µA 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

APPLICATIONS

■ Direct Sensor Digitizer

■ Direct Temperature Measurement

■ Instrumentation

■ Industrial Process Control

DESCRIPTION

The LTC®2486 is a 4-channel (2-channel differential), 16-bit, No Latency ΔΣ™ 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.

TYPICAL APPLICATION

ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)

Supply Voltage (V_CC) ................................... –0.3V to 6V

Analog Input Voltage

    (CH0 to CH3, COM) ..................–0.3V to (VCC + 0.3V)

    REF+, REF– ................................–0.3V to (VCC + 0.3V)

Digital Input Voltage ......................–0.3V to (VCC + 0.3V)

Digital Output Voltage ...................–0.3V to (VCC + 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

Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.

Note 2: All voltage values are with respect to GND.

PACKAGE/ORDER INFORMATION

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