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MCP3911A0-E/SS

Dual-ch 24-bit energy metering AFE, 125kSPS, PGA 1-32x, 94.5dB SINAD, 1.2V ref, SSOP-20

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Manufacturer Part：

MCP3911A0-E/SS

Package：

SSOP-20 (208mil body, 7.2 x 5.3mm)

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Description

Product Overview

The MCP3911A0-E/SS is a 3.3V dual-channel energy metering analog front end (AFE) from Microchip, featuring two simultaneous-sampling 24-bit delta-sigma ADCs with programmable gain amplifiers (PGA). With 94.5dB SINAD and -106.5dBc THD, it meets IEC 62053-22 Class 0.1S metering standards. The device includes a low-drift 1.2V internal reference, phase delay compensation, and a 20MHz SPI interface in a 20-lead SSOP package.

Key Specifications

ADC Resolution 16/24-bit (configurable)
Channels 2 (simultaneous sampling)
Sample Rate Up to 125 kSPS per channel
PGA Gain 1x to 32x (per channel)
SINAD 94.5 dB (typical)
THD -106.5 dBc (up to 35th harmonic)
SFDR 111 dB (typical)
SNR 95 dB (typical)
Internal Reference 1.2V, 7 ppm/°C drift
Supply Voltage 2.7V to 3.6V
Power 8.9 mW typical @ 3.3V
Interface SPI, up to 20MHz
Package SSOP-20 (208mil)
Operating Temperature -40°C to +125°C
Qualification AEC-Q100 Grade 1

Features

  • Two simultaneous-sampling 24-bit delta-sigma ADCs
  • Independent PGAs with gains from 1x to 32x per channel
  • 94.5dB SINAD and 111dB SFDR for high-accuracy metering
  • Low-drift internal 1.2V reference (7 ppm/°C)
  • Phase delay compensation with 1µs resolution
  • Per-channel 24-bit digital offset and gain calibration
  • Separate modulator output pins for each channel
  • Independent data ready pin for synchronization
  • Continuous read/write modes for efficient SPI communication
  • Ultra-low power shutdown mode (<2µA)

Applications

  • Single-phase and poly-phase energy meters (IEC/ANSI compliant)
  • Power monitoring and measurement systems
  • Industrial power quality analyzers
  • Electric vehicle charging stations
  • Smart grid and demand response systems
  • Server and data center power monitoring

The MCP3911A0-E/SS is a 3.3V dual-channel analog front end (AFE) from Microchip Technology, designed for high-precision energy metering and power monitoring applications. It contains two simultaneous-sampling 24-bit delta-sigma ADCs with independent programmable gain amplifiers (PGA, 1x to 32x) on each channel. With 94.5dB SINAD, -106.5dBc THD, and 111dB SFDR, it meets the accuracy requirements of IEC 62053-22 Class 0.1S and ANSI C12.20 standards. The device integrates a low-drift 1.2V internal voltage reference (7 ppm/°C), phase delay compensation with 1µs resolution, per-channel offset and gain calibration registers, and a high-speed 20MHz SPI interface. The AEC-Q100 Grade 1 qualification enables automotive power monitoring applications.

The MCP3911 contains two independent delta-sigma ADC channels, each with a PGA front-end, third-order modulator, and decimation filter. The PGA amplifies small shunt voltage signals before the modulator, with gains programmable from 1x to 32x. Each modulator oversamples the input at rates up to 4MHz, producing a high-speed bit stream that the digital decimation filter converts to 24-bit output data. The OSR (oversampling ratio) is programmable from 32 to 4096, trading resolution for data rate. Phase delay compensation aligns the voltage and current channel data with 1µs resolution, critical for accurate power measurement with reactive loads. Per-channel calibration registers correct for system-level offset and gain errors. The SPI interface supports continuous read mode, allowing the host MCU to read both channels’ data in a single DMA transfer.

Pin Name Description
1 VSS Ground
2 CH0+ Channel 0 positive input (current)
3 CH0- Channel 0 negative input (current)
4 AVDD Analog supply (2.7-3.6V)
5 CH1+ Channel 1 positive input (voltage)
6 CH1- Channel 1 negative input (voltage)
7 VREF+ Positive reference input (or internal ref out)
8 VREF- Negative reference input
9 CLKIN Clock input / crystal connection
10 CLKOUT Clock output / crystal connection
11 OSCH Oscillator high-speed mode select
12 DVDD Digital supply (2.7-3.6V)
13-16 MCLK,MDAT0,MDAT1,DR Modulator outputs and data ready
17 CS SPI chip select
18 SCK SPI clock
19 SDI SPI data input
20 SDO SPI data output
  • Single-Phase Energy Meter: Connect a current shunt to CH0 (with PGA gain of 32x for mV-level signals) and a voltage divider to CH1 (gain 1x). The 94.5dB SINAD provides 0.1% accuracy across a 1000:1 dynamic range, meeting IEC 62053-22 Class 0.1S. Phase delay compensation aligns the channels for accurate real and reactive power measurement.
  • EV Charging Station: Monitor charging current and voltage simultaneously. The simultaneous sampling ensures that current and voltage measurements are time-aligned for accurate power calculation. Use the AEC-Q100 qualified version for automotive-grade reliability. The 125kSPS data rate captures fast transients during connection and disconnection events.
  • Server Power Monitoring: Measure server rack power consumption in real-time. Connect current transformers to CH0 and line voltage dividers to CH1. The per-channel calibration registers compensate for sensor offset and gain errors. Continuous SPI read mode streams power data to the BMC via DMA with minimal CPU overhead.
Model Channels Resolution SINAD Key Difference
MCP3912 3 24-bit 93.5dB Three channels, for 3-phase
MCP3901 2 24-bit 88dB Predecessor, lower performance
AFE5404 4 24-bit 86dB TI, 4-channel for 3-phase+neutral
RN8209C 2 24-bit 90dB Renergy, single-phase metering
ADE7953 2 24-bit 80dB ADI, integrated metrology engine
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Contact Information

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Service & Packaging

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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