MCP3910 Datasheet, PDF (1/86 Pages) Microchip Technology – 3V Two-Channel Analog Front End

MCP3910
3V Two-Channel Analog Front End
Features:
• Two Synchronous Sampling 24-bit Resolution
Delta-Sigma A/D Converters
• 93.5 dB SINAD, -107 dBc Total Harmonic
Distortion (THD) (up to 35^th harmonic), 112 dB
Spurious-Free Dynamic Range (SFDR) for Each
Channel
• Flexible Serial Interface that Includes Both SPI
and a Simple 2-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 AV_DD, DV_DD
• 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)
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
Ration (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, and with the 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 2-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.
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
 2012-2014 Microchip Technology Inc.
DS20005116B-page 1