MCP3901_11 Datasheet, PDF (1/62 Pages) Microchip Technology – Two-Channel Analog Front End Portable Instrumentation

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 Total Harmonic Distortion
(THD) (up to 35^th harmonic), 109 dB Spurious-free
Dynamic Range (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 SSOP and QFN
Packages
• Industrial Temperature Ranges:
- Industrial: -40°C to +85°C
- Extended: -40°C to +125°C
Applications
• Energy Metering and 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,
oversampling ratio, phase, resolution, dithering,
shutdown, Reset and several communication features.
The communication is largely simplified with various
Continuous Read modes that can be accessed by the
Direct Memory Access (DMA) of an MCU and with a
separate data ready pin that can be connected directly
to an Interrupt Request (IRQ) input of an 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
© 2011 Microchip Technology Inc.
* Includes Exposed Thermal Pad (EP); see Table 3-1.
DS22192D-page 1