The MCP3421 ADC can be used for various high accuracy analog-to-digital data conversion applications where ease of use, low power consumption and small footprint are major considerations.The MCP3421 is a single channel low-noise, high accuracy delta-sigma A/D converter with differential inputs and up to 18 bits of resolution in a small SOT-23-6 package. Please consider the MCP3425 version for resolutions up to 16 bits. The on-board precision 2.048V reference voltage enables a differential input range of ±2.048V. The device uses a two-wire I2C™ compatible interface and operates from a single power supply ranging from 2.7V to 5.5V. The MCP3421 ADC performs conversions at rates of 3.75, 15, 60 or 240 samples per second with corresponding resolutions of 18, 16, 14 and 12 bits. The onboard programmable gain amplifier (PGA) provides gain up to 8x. The device has two conversion modes: Continuous mode and One-Shot mode. In One-Shot mode, the device enters a low current standby mode automatically after a conversion, greatly reducing power use.

• 18-bit resolution
• Small 6-lead SOT-23 packaging
• Differential input operation
• On-board voltage reference with 5 ppm/°C drift
• On-board PGA, gains of 1, 2, 4, 8
• Programmable data rate options
  • 3.75 SPS (18 bits)
  • 15 SPS (16 bits)
  • 60 SPS (14 bits)
  • 240 SPS (12 bits)
• INL 10 ppm of FSR max
• Low current consumption, 145 µA at 3V
• One-shot or continuous conversion options
• Supports I²C™ serial interface
• Extended temperature range: -40°C to +125°C