MCP3901 Datasheet, PDF (1/60 Pages) Microchip Technology – Two Channel Analog Front End

MCP3901
Two Channel Analog Front End
Features
• Two synchronous sampling 16/24-bit resolution
Delta-Sigma A/D Converters with proprietary
multi-bit architecture
• 91 dB SINAD, -104 dBc THD (up to 35^th harmonic),
109 dB SFDR for each channel
• Programmable data rate up to 64 ksps
• Ultra low power shutdown mode with <2 µA
• -133 dB Crosstalk between the two channels
• Low Drift Internal Voltage Reference: 12 ppm/°C
• Differential Voltage Reference Input Pins
• High Gain PGA on each channel (up to 32 V/V)
• Phase Delay Compensation between the two
channels with 1 µs time resolution
• Separate Modulator outputs for each channel
• High-Speed Addressable 20 MHz SPI Interface
with Mode 0,0 and 1,1 Compatibility
• Independent analog and digital power supplies
4.5V-5.5V AV_DD, 2.7V-5.5V DV_DD
• Low Power consumption (14 mW typical at 5V)
• Available in small 20-lead QFN and SSOP
packages
• Industrial Temperature Range -40°C to +85°C
Applications
• Energy Metering & Power Measurement
• Automotive
• Portable Instrumentation
• Medical and Power Monitoring
Description
The MCP3901 is a dual channel analog front end (AFE)
containing two synchronous sampling delta-sigma
Analog-to-Digital Converters (ADC), two PGAs, phase
delay compensation block, internal voltage reference,
modulator output block, and high-speed 20 MHz SPI
compatible serial interface. The converters contain a
proprietary dithering algorithm for reduced idle tones
and improved THD.
The internal register map contains 24-bit wide ADC
data words, a modulator output byte as well as six
writable control registers to program gain,
over-sampling ratio, phase, resolution, dithering, shut-
down, reset and several communication features. The
communication is largely simplified with various
continuous read modes that can be accessed by the
DMA of a MCU and with separate data ready pin that
can directly be connected to an IRQ input of a MCU.
The MCP3901 is capable of interfacing to 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
CH1+ 4
14 CS
EP
21
13 OSC2
12 OSC1/CLKI
AGND ⁵
11 DR
6 7 8 9 10
© 2009 Microchip Technology Inc.
DS22192A-page 1