Overview
The MCP3421A0T-E/CH is a high-accuracy, single-channel, 18-bit delta-sigma analog-to-digital converter (ADC) produced by Microchip Technology. This device is packaged in a compact SOT-23-6 package, making it suitable for a variety of applications requiring precise analog-to-digital conversion. The MCP3421 features differential input operation, self-calibration of internal offset and gain, and an on-board precision voltage reference. It operates over a wide temperature range from -40°C to +125°C and supports single supply operation from 2.7V to 5.5V.
Key Specifications
| Parameter | Min | Typical | Max | Units | Conditions |
|---|---|---|---|---|---|
| Resolution | - | 18 bits | - | - | - |
| Sample Rates | - | 3.75, 15, 60, 240 SPS | - | - | - |
| Input Range | - | ±2.048V (differential) | - | - | - |
| Voltage Reference Accuracy | - | 2.048V ± 0.05% | - | - | - |
| Voltage Reference Drift | - | 15 ppm/°C | - | - | - |
| Programmable Gain Amplifier (PGA) | - | Gains of 1, 2, 4, or 8 | - | - | - |
| Supply Voltage | 2.7V | - | 5.5V | V | - |
| Operating Temperature Range | -40°C | - | +125°C | °C | - |
| Current Consumption (Continuous Conversion) | - | 145 µA (VDD= 3V) | - | µA | - |
| Current Consumption (One-Shot Conversion) | - | 39 µA (VDD= 3V, 1 SPS) | - | µA | - |
Key Features
- Differential input operation
- Self-calibration of internal offset and gain per each conversion
- On-board precision 2.048V voltage reference with ±0.05% accuracy and 15 ppm/°C drift
- On-board programmable gain amplifier (PGA) with gains of 1, 2, 4, or 8
- On-board oscillator
- 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
Applications
- Portable Instrumentation
- Weigh Scales and Fuel Gauges
- Temperature Sensing with RTD, Thermistor, and Thermocouple
- Bridge Sensing for Pressure, Strain, and Force
Q & A
- What is the resolution of the MCP3421 ADC?
The MCP3421 has a resolution of up to 18 bits. - What are the available sample rates for the MCP3421?
The MCP3421 supports sample rates of 3.75, 15, 60, and 240 samples per second (SPS). - What is the input range of the MCP3421?
The input range is ±2.048V differentially. - What is the accuracy of the on-board voltage reference?
The on-board voltage reference has an accuracy of 2.048V ± 0.05%. - What gains are available on the programmable gain amplifier (PGA)?
The PGA offers gains of 1, 2, 4, or 8. - What is the operating temperature range of the MCP3421?
The operating temperature range is -40°C to +125°C. - How much current does the MCP3421 consume in continuous conversion mode?
The current consumption in continuous conversion mode is typically 145 µA at VDD = 3V. - How much current does the MCP3421 consume in one-shot conversion mode?
The current consumption in one-shot conversion mode is typically 39 µA at VDD = 3V and 1 SPS. - What serial interface does the MCP3421 support?
The MCP3421 supports the I2C serial interface in Standard, Fast, and High Speed Modes. - What are some typical applications of the MCP3421?
Typical applications include portable instrumentation, weigh scales and fuel gauges, temperature sensing, and bridge sensing for pressure, strain, and force.
