MCP3911 Datasheet, PDF (1/72 Pages) Microchip Technology – 3.3V Two-Channel Analog Front Endx1null

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 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
• LowDrift1.2V InternalVoltageReference:7 ppm/°C
• Differential Voltage Reference Input Pins
• High Gain 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 Pack-
ages, 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 fea-
tures 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, and 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
SSOP
RESET 1
DV_DD 2
AV_DD 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
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 Microchip Technology Inc.
DS22286A-page 1