Microchip Technology ARD00385 Ficha De Dados

 2012-2013 Microchip Technology Inc.

DS20002286C-page 1

• 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 35

th

 harmonic), 111 dB 

SFDR for Each Channel

• 2.7V – 3.6V AV

DD

, DV

DD

• 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
• Low Drift 1.2V Internal Voltage Reference: 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

• Energy Metering and Power Measurement
• Automotive
• Portable Instrumentation
• Medical and Power Monitoring
• Audio/Voice Recognition

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.

OSC1/CLKI

1
2
3
4

20
19
18
17
16
15
14

13

5
6
7
8

OSC2

SDI

RESET

DV

DD

AV

DD

CH0+

CH0-

CH1-

12

9

D

GND

MDAT0
MDAT1

DR 

CH1+

A

GND

SDO

11

10

REFIN+/OUT

REFIN-

CS

SCK

SDO

2

CH1-

CH1+

CH0+

SCK

CS

REFIN+/OUT

OSC2

REFIN

-

D

GND

MDA

T

1

OSC1/CLKI

AV

DD

DV

DD

RES

E

T

SD

I

CH0-

EP

20

1

19 18 17

3

4

14

13
12

11

6

7

8

9

21

5

10

15

16

A

GND

MDA

T

0

DR

* 

Includes Exposed Thermal Pad (EP); see