Microchip MCP3421

Microchip MCP3421 Analog-to-Digital Converter (ADC) can be used for a variety of high-accuracy analog-to-digital data conversion applications where ease of use, low power consumption and small footprint are major considerations. It is a single-channel, low-noise, high-accuracy delta-sigma ADC 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 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 up to eight times gain. The device has two conversion modes: the 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.

Features

• 18-bit delta-sigma ADC in SOT-23 package
• On-board voltage reference:
  • Accuracy: 2.048V ±0.05%
  • Drift: 15 ppm/°C
• On-board PGA with gains of 1,2, 4 or 8
• On-board voltage reference with 5 ppm/°C drift
• On-board programmable data rate options
  • 3.75 SPS (18 bits)
  • 15 SPS (16 bits)
  • 60 SPS (14 bits)
  • 240 SPS (12 bits)
• Supports I²C serial interface
  • Standard, fast, high-speed modes

Applications

• Portable instrumentation
• Weigh scales and fuel gauges
• Temperature sensing with RTD, thermistor and thermocouple
• Bridge sensing for pressure, strain and force

MCP3421 Evaluation Board