Description:
The MCP3910 is a 3V two-channel Analog Front End
(AFE), containing two synchronous sampling
Delta-Sigma, Analog-to-Digital Converters (ADC), two
Programmable Gain Amplifiers (PGA), phase delay
compensation block, low-drift internal voltage
reference, Digital Offset and Gain Errors Calibration
registers and high-speed 20 MHz SPI-compatible
serial interface.
The MCP3910 ADCs are fully configurable with
features such as: 16-/24-bit resolution, Oversampling
Ratio (OSR) from 32 to 4096, gain from 1x to 32x,
independent shutdown and Reset, dithering and
auto-zeroing. Communication is largely simplified with
8-bit commands, including various continuous Read/
Write modes and 16-/24-/32-bit data formats that can
be accessed by the Direct Memory Access (DMA) of an
8, 16 or 32-bit MCU. It also includes a separate Data
Ready pin that can directly be connected to an Interrupt
Request (IRQ) input of an MCU.
The MCP3910 includes advanced security features to
secure the communications and the configuration settings,
such as a CRC-16 checksum on both serial data
outputs and on the static register map configuration. It
also includes a register map lock through an 8-bit
password to stop unwanted WRITE commands from
processing.
For polyphase shunt-based energy meters, the
MCP3910 two-wire serial interface greatly reduces
system cost, requiring only a single bidirectional
isolator per phase.
The MCP3910 is capable of interfacing a variety of voltage
and current sensors, including shunts, current
transformers, Rogowski coils and Hall effect sensors.

Features:
• Two Synchronous Sampling 24-Bit Resolution
Delta-Sigma A/D Converters
• 93.5 dB SINAD, -107 dBc Total Harmonic
Distortion (THD) (up to 35th harmonic), 112 dB
Spurious-Free Dynamic Range (SFDR) for Each
Channel
• Flexible Serial Interface that Includes Both SPI
and a Simple Two-Wire Interface Ideal for
Polyphase Shunt Energy Meters
• 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 Cyclic Redundancy Check (CRC)
Checksum and Interrupt Alert for Register
Map Configuration
- Register Map Lock with 8-Bit Secure Key
• 2.7V-3.6V AVDD, DVDD
• Programmable Data Rate, Up to 125 ksps:
- 4 MHz Maximum Sampling Frequency
- 16 MHz Maximum Master Clock
• Oversampling Ratio, Up to 4096
• Ultra Low-Power Shutdown Mode with < 10 μA
• -122 dB Crosstalk between Channels
• Low-Drift 1.2V Internal Voltage Reference:
9 ppm/°C
• Differential Voltage Reference Input Pins
• High-Gain Programmable Gain Amplifier (PGA)
on Each Channel (up to 32 V/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
• High-Speed 20 MHz SPI Interface with Mode 0,0
and 1,1 Compatibility
• Continuous Read/Write Modes for Minimum
Communication with Dedicated 16-/32-Bit Modes
• Available in 20-Lead QFN and SSOP Packages
• Extended Temperature Range: -40°C to +125°C
(All Specifications are Valid Down to -45°C Operation)

Applications:
• Single-Phase and Polyphase Energy Meters
• Energy Metering and Power Measurement
• Automotive
• Portable Instrumentation
• Medical and Power Monitoring
• Audio/Voice Recognition
• Isolated Sensor Applications