Microchip MCP3421, ADC with Programmable Gain Amplifier

Microchip released MCP3421 18-bit Analog-to-Digital Converter (ADC). MCP3421 features an integrated voltage reference and on-chip Programmable Gain Amplifier (PGA). The MCP3421 ADC uses an I2C™ compatible serial interface and operates from a single power supply (2.7V to 5.5V). Very low power consumption (155 microAmperes (µA) at 5V continuous conversion) helps to extend battery life in portable

devices. Additionally, with the device’s onboard Programmable Gain Amplifier, users can select the gains of x1, x2, x4 or x8 before the analog-to-digital conversion takes place, enabling very high-resolution conversion of even small input signals.

Example applications for the MCP3421 ADC:

• Industrial (portable instrumentation, pressure sensors, weigh scales, handheld meters and multimeters)
• Medical (heart rate monitors and blood glucose meters)
• Consumer (weigh scales and handheld meters)
• Automotive (sensor interfaces and fuel gauges)

Development Support
For designers wanting to evaluate the MCP3421 ADC in their applications, Microchip offers the MCP3421 Evaluation Board (Part # MCP3421EV). The board is available today for $15.

Pricing and Availability
The device is available in a 6-pin, SOT-23 package for $1.71 each in 10,000-unit quantities.

Source: Microchip