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MCP3911

3.3V Two-Channel Analog Front End

Microchip Technology 

MCP3911

3.3V Two-Channel Analog Front End

Features

• Two Synchronous Sampling 16/24-bit Resolution

Delta-Sigma A/D Converters

• 94.5 dB SINAD, -106.5 dBc Total Harmonic

Distortion (THD) (up to 35th harmonic), 111 dB

SFDR for Each Channel

• 2.7V – 3.6V AVDD, DVDD

• Programmable Data Rate up to 125 ksps

- 4 MHz Maximum Sampling Frequency

• Oversampling Ratio up to 4096

• Ultra Low Power Shutdown Mode with <2 µA

• -122 dB Crosstalk between the Two Channels

• LowDrift1.2VInternalVoltageReference:7 ppm/°C

• Differential Voltage Reference Input Pins

• High Gain Programmable Gain Amplifier (PGA)

on Each Channel (up to 32V/V)

• Phase Delay Compensation with 1 µs Time

Resolution

• Separate Modulator Output Pins for Each

Channel

• 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

• Low Power Consumption (8.9 mW at 3.3V,

5.6 mW at 3.3V in low-power mode, typical)

• Available in Small 20-lead QFN and SSOP

Packages, Pin-to-pin Compatible with MCP3901

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

Applications

• Energy Metering and Power Measurement

• Automotive

• Portable Instrumentation

• Medical and Power Monitoring

• Audio/Voice Recognition

Description

The MCP3911 is a 2.7V to 3.6V dual channel Analog

Front End (AFE) containing two synchronous sampling

Delta-Sigma Analog-to-Digital Converters (ADC), two

PGAs, phase delay compensation block, low-drift

internal voltage reference, modulator output block,

digital offset and gain errors calibration registers and

high-speed 20 MHz SPI compatible serial interface.

The MCP3911 ADCs are fully configurable with

features such as: 16/24-bit resolution, OSR from 32 to

4096, gain from 1x to 32x, independent shutdown and

reset, dithering and auto-zeroing. The communication

is largely simplified with the one-byte-long commands

including various continuous read/write modes that can

be accessed by the Direct Memory Access (DMA) of an

MCU with a separate data ready pin that can be directly

connected to an Interrupt Request (IRQ) input of an

MCU.

The MCP3911 is capable of interfacing a large variety

of voltage and current sensors including shunts,

current transformers, Rogowski coils and Hall effect

sensors.

Package Type

20-Lead RESET 1

SSOP

DVDD 2

AVDD 3

CH0+ 4

CH0- 5

CH1- 6

CH1+ 7

AGND 8

REFIN+/OUT 9

REFIN- 10

20 SDI

19 SDO

18 SCK

17 CS

16 OSC2

15 OSC1/CLKI

14 DR

13 MDAT0

12 MDAT1

11 DGND

20-Lead

4x4 QFN*

20 19 18 17 16

CH0+ 1

15 SCK

CH0- 2

CH1- 3

EP

14 CS

21

13 OSC2

CH1+ 4

12 OSC1/CLKI

AGND 5

11 DR

6 7 8 9 10

 2012-2013 Microchip Technology Inc.

* Includes Exposed Thermal Pad (EP); see Table 3-1.

DS20002286C-page 1

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