Description
The MCP3421 is a single channel low-noise, high accuracy ΔΣ A/D converter with differential inputs and up to 18 bits of resolution in a small SOT-23-6 package. The on-board precision 2.048V reference voltage enables an input range of ±2.048V differentially (Δ voltage = 4.096V). The device uses a two-wire I2C compatible serial interface and operates from a single 2.7V to 5.5V power supply.

Features
• 18-bit ΔΣ ADC in a SOT-23-6 package
• Differential Input Operation
• Self Calibration of Internal Offset and Gain Per
   Each Conversion
• On-Board Voltage Reference:
   - Accuracy: 2.048V ± 0.05%
   - Drift: 15 ppm/°C
• On-Board Programmable Gain Amplifier (PGA):
   - Gains of 1,2, 4 or 8
• On-Board Oscillator
• INL: 10 ppm of FSR (FSR = 4.096V/PGA)
• Programmable Data Rate Options:
   - 3.75 SPS (18 bits)
   - 15 SPS (16 bits)
   - 60 SPS (14 bits)
   - 240 SPS (12 bits)
• One-Shot or Continuous Conversion Options
• Low Current Consumption:
   - 145 µA typical
      (VDD= 3V, Continuous Conversion)
   - 39 µA typical
      (VDD= 3V, One-Shot Conversion with 1 SPS)
• Supports I2C Serial Interface:
   - Standard, Fast and High Speed Modes
• Single Supply Operation: 2.7V to 5.5V
• Extended Temperature Range: -40°C to +125°C

Typical Applications
• Portable Instrumentation
• Weigh Scales and Fuel Gauges
• Temperature Sensing with RTD, Thermistor, and
   Thermocouple
• Bridge Sensing for Pressure, Strain, and Force.