Microchip MCP3911 manual

Microchip MCP3911
8 · 1
PDF user manual
 · 74 pages
English
user manualMicrochip MCP3911
2012-2020 Microchip Technology Inc. DS20002286D-page 1

MCP3911

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 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

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 Error 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, Oversampling
Ratio (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

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
1110
REFIN+/OUT
REFIN-
CS
SCK
SDO
20-Lead
SSOP
20-Lead
4x4 QFN*
2
CH1-
CH1+
CH0+
SCK
CS
REFIN+/OUT
OSC2
REFIN-
D
GND
MDAT1
OSC1/CLKI
AV
DD
DV
DD
RESET
SDI
CH0-
EP
20
1
19 18 17
3
4
14
13
12
11
6789
21
5
10
15
16
A
GND
MDAT0
DR
*Includes Exposed Thermal Pad (EP); see Table 3-1.

3.3V Two-Channel Analog Front End

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MCP3911
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