MCP3918 datasheet(1/88 Pages) MICROCHIP

Teilenummer	MCP3918

Bauteilbeschribung	3V Single-Channel Analog Front End

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Hersteller	MICROCHIP [Microchip Technology]

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 2014 Microchip Technology Inc.

DS20005287A-page 1

MCP3918

Features:

• One 24-bit Resolution Delta-Sigma A/D Converter

• 93.5 dB SINAD, -107 dBc Total Harmonic

Distortion (THD) (up to 35th harmonic), 112 dB

Spurious-Free Dynamic Range (SFDR)

• Flexible Serial Interface that Includes Both SPI

and a Simple 2-Wire Interface Ideal for Polyphase

Shunt Energy Meters

• 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

• Low-Drift 1.2V Internal Voltage Reference:

9 ppm/°C

• Differential Voltage Reference Input Pins

• High-Gain Programmable Gain Amplifier (PGA)

(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

• 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)

Description:

The MCP3918 is a 3V single-channel Analog Front End

(AFE), containing one delta-sigma, Analog-to-Digital

Converter (ADC), one programmable gain amplifier

(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 MCP3918 ADC is 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-/32-bit MCU, and with the separate Data

Ready pin that can be directly connected to an Interrupt

Request (IRQ) input of an MCU.

The MCP3918 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

register-map

static

configuration. It also includes a register-map lock

through an 8-bit password to avoid the processing of

any unwanted write commands.

For polyphase shunt-based energy meters, the

MCP3918 2-Wire serial interface greatly reduces

system cost, requiring only a single bidirectional

isolator per phase.

The MCP3918 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

• Isolator Sensor Application

3V Single-Channel Analog Front End

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