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
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
DV
DD
AV
DD
CH0+
CH0-
CH1-
CH1+
AGND
REFIN/OUT+
REFIN-
1
2
3
4
5
6
7
8
9
10
RESET
20
19
18
17
16
15
14
13
12
11
SDI
SDO
SCK
CS
OSC2
OSC1/CLKI
DR
MDAT0
MDAT1
DGND
Applications
•
•
•
•
Energy Metering & Power Measurement
Automotive
Portable Instrumentation
Medical and Power Monitoring
20-Lead
QFN
CH0+ 1
CH0-
CH1-
CH1+
AGND
2
3
4
5
AV
DD
DV
DD
20 19 18 17 16
15 SCK
14 CS
EP
21
13 OSC2
12 OSC1/CLKI
11 DR
6
REFIN/OUT+
7
REFIN-
8
DGND
9
MDAT1
10
MDAT0
©
2009 Microchip Technology Inc.
SDO
SDI
DS22192A-page 1
MICROCHIP [ MICROCHIP TECHNOLOGY ]
