MCP3912B中文资料微芯科技数据手册PDF规格书

Features

• Four 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 dBFS

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 - 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 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 Time with Dedicated

16/32-Bit Modes

• Available in 28-Lead QFN and 28-Lead SSOP

Packages

• Extended Temperature Range: -40°C to +125°C

Description

The MCP3912B is a 3V four-channel Analog Front End

(AFE) containing four synchronous sampling Delta-

Sigma Analog-to-Digital Converters (ADC), four PGAs,

phase delay compensation block, low-drift internal voltage

reference, Digital Offset and Gain Error Calibration

registers and high-speed 20 MHz SPI-compatible serial

interface.

The MCP3912B 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 autozeroing.

The 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. A separate Data Ready pin is also

included that can be directly connected to an Interrupt

Request (IRQ) input of an MCU.

The MCP3912B includes advanced security features to

secure the communications and the configuration settings,

such as a CRC-16 checksum on both serial data

outputs and static register map configuration. It also

includes a register map lock through an 8-bit secure key

to stop unwanted WRITE commands from processing.

The MCP3912B is capable of interfacing with a variety

of voltage and current sensors, including shunts, current

transformers, Rogowski coils and Hall effect sensors.

Applications

• Polyphase Energy Meters

• Energy Metering and Power Measurement

• Automotive

• Portable Instrumentation

• Medical and Power Monitoring

• Audio/Voice Recognition