Microchip Technology MCP3914B 3V Eight-Channel Analog Front Ends (AFEs)
Microchip Technology MCP3914B 3V Eight-Channel Analog Front Ends (AFEs) feature 24-bit eight synchronous-sampling Delta-Sigma Analog-to-Digital Converters (ADCs). These AFEs include eight PGAs, a phase-delay compensation block, a low-drift internal voltage reference, digital offset, gain-error calibration registers, and a high-speed 20MHz SPI-compatible serial interface. The MCP3914B ADCs are fully configurable with 16/24-bit resolution, 32 to 4096 OSR, 1x to 32x gain, independent shutdown and reset, dithering, and auto-zeroing. These AFEs incorporate advanced security features to protect communications and configuration settings, including a CRC-16 checksum on serial data outputs and the static register map configuration. The MCP3914B AFEs are available in a 40-lead UQFN package and an extended temperature range of -40°C to +125°C. Typical applications include polyphase energy meters, energy metering and power measurement, automotive, portable instrumentation, medical and power monitoring, and audio/voice recognition.
Features
- Eight synchronous sampling 24-bit resolution Delta-Sigma Analog-to-Digital (A/D) converters
- 94.5dB SINAD, -107dBc Total Harmonic Distortion (THD) (up to 35th Harmonic), and 112dBFS SFDR for each channel
- Enables 0.1% typical active power measurement error over a 10,000:1 dynamic range
- Advanced security features:
- 16-bit Cyclic Redundancy Check (CRC) Checksum on all communications for secure data transfers
- 16-bit CRC checksum and interrupt alert for register map configuration
- Register map lock with 8-bit secure key
- 2.7V to 3.6V AVDD and DVDD
- Programmable data rate up to 125ksps:
- 4MHz maximum sampling frequency
- 16MHz maximum master clock
- Up to 4096 oversampling ratio
- Ultra-low power shutdown mode with <10µA
- -122dB crosstalk between channels
- 9ppm/°C low-drift 1.2V internal voltage reference
- Differential voltage reference input pins
- High-gain Programmable Gain Amplifier (PGA) on each channel (up to 32V/V)
- Phase delay compensation with 1µs time resolution
- Separate data-ready pin for easy synchronization
- Individual 24-bit digital offset and gain error correction for each channel
- High-speed 20MHz Serial Peripheral Interface (SPI) with mode 0,0 and 1,1 compatibility
- Continuous read/write modes for minimum communication time with dedicated 16/32-bit modes
- Available in a 40-lead UQFN package
- -40°C to +125°C extended temperature range
Applications
- Polyphase energy meters
- Energy metering and power measurement
- Automotive
- Portable instrumentation
- Medical and power monitoring
- Audio/voice recognition
Functional Block Diagram
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