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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 ¦ÌA

? -122 dB Crosstalk between Channels

? Low-Drift 1.2V Internal Voltage Reference:

9 ppm/¡ãC

? Differential Voltage Reference Input Pins

? High-Gain Programmable Gain Amplifier (PGA)

on Each Channel (up to 32 V/V)

? Phase Delay Compensation with 1 ¦Ìs 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¡ãC to +125¡ãC

(All Specifications are Valid Down to -45¡ãC 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