Two New AFEs Complete Microchip’s MCP391X Family, Which Spans 1 to 8-Channel Members for Single-Phase and Poly-Phase Energy Measurement
Microchip Technology Inc. announced the completion of its high-accuracy, 1-8 channel, single and poly-phase MCP391X energy-measurement Analog Front End (AFE) family. The new MCP3919 and MCP3912 members integrate three and four channels of 24-bit, delta-sigma Analog-to-Digital Conversion (ADC), respectively, with industry-leading accuracy of 93.5 dB SINAD, -107 dB THD and 112 dB SFDR for precise signal acquisition and higher-performing end products. These are the optimal numbers of channels for single-phase energy meters with neutral monitoring (3-channel); or single-phase, three-wire energy meters (4-channel). The high level of integration on the new AFEs also includes a low-drift voltage reference, programmable gain amplifiers, phase-delay compensation and cyclic redundancy check (CRC).
As the energy-metering infrastructure is being upgraded worldwide, designers are demanding increased AFE accuracy and integration to develop the latest generation of smart meters. These features are also required by the designers of advanced power-monitoring systems for applications such as server power supplies and power distribution units, electronic circuit breakers, smart power strips and other data-acquisition products in the industrial, commercial and consumer markets. Microchip’s newest AFEs improve application performance with their industry-leading accuracy, high integration and optimal number of channels for single-phase energy measurement. Additionally, the high AFE accuracy facilitates energy-meter calibration, which reduces production costs.
Features
- Three Synchronous Sampling 24-bit Delta-Sigma A/D Converters
- 93.5 dB SINAD, -107 dBc THD, 112 dBFS SFDR
- Enables 0.1% Typical Active Power Measurement Error over a 10,000:1 Dynamic Range
- 2.7V - 3.6V AVDD, DVDD
- Programmable Data Rate up to 125 ksps
- 4 MHz Maximum Sampling Frequency
- Advanced Security Features
- Ultra Low Power Shutdown Mode with <10 µA
- -122 dB Crosstalk between the Two Channels
- Low Drift 1.2V Internal Voltage Reference: 9 ppm/°C
- Differential Voltage Reference Input Pins
- High Gain PGA on Each Channel (up to 32V/V)
- Phase Delay Compensation with 1 µs Time Resolution
- Separate Data Ready Pin for Easy Synchronization
- Individual 24-bit Digital Offset and Gain Error Correction for Each Channel
- Flexible serial interface that includes both SPI and a simple 2-wire interface ideal for polyphase shunt energy meters
- Continuous Read/Write Modes for Minimum Communication
- Available in 28-Lead QFN and SSOP Packages
Development Support
Microchip also announced two new tools to aid in the development of energy systems using these latest AFEs. The MCP3912 Evaluation Board (part # ADM00499) and MCP3919 Evaluation Board (part # ADM00573) can each be purchased today for $129.99.
Pricing & Availability
The MCP3912 and MCP3919 AFEs are both available today for sampling and volume production, with prices starting at $1.84 each in 5,000-unit quantities.
