MCP3903 Datasheet, PDF (1/54 Pages) Microchip Technology – Six Channel Delta Sigma A/D Converter

MCP3903
Six Channel Delta Sigma A/D Converter
Features
• Six Synchronous Sampling 16/24-bit Resolution
Delta-Sigma A/D Converters with Proprietary
Multi-Bit Architecture
• 91 dB SINAD, -100 dBc Total Harmonic Distortion
(THD) (up to 35^th harmonic), 102 dB Spurious-free
Dynamic Range (SFDR) for Each Channel
• Programmable Data Rate up to 64 ksps
• Ultra Low-Power Shutdown Mode with <2 μA
• -115 dB Crosstalk Between any Two Channels
• Low Drift Internal Voltage Reference: 5 ppm/°C
• Differential Voltage Reference Input Pins
• High Gain PGA on Each Channel (up to 32 V/V)
• Phase Delay Compensation Between Each Pair
of Channels with 1 μs Time Resolution
• High-Speed Addressable 10 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 - 3.6V DV_DD
• Available in Small 28-lead SSOP Package
• Extended Temperature Range: -40°C to +125°C
Applications
• Energy Metering and Power Measurement
• Portable Instrumentation
• Medical and Power Monitoring
Description
The MCP3903 is a six-channel Analog Front End (AFE)
containing three pairs made out of two synchronous
sampling Delta-Sigma Analog-to-Digital Converters
(ADC) with PGA, a phase delay compensation block,
internal voltage reference, and high-speed 10 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 register as well as six
24-bit 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
Direct Memory Access (DMA) of an MCU and with
separate Data Ready pins that can directly be
connected to the Interrupt Request (IRQ) input of an
MCU. The MCP3903 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
28-Lead SSOP
AV_DD 1
CH0+ 2
CH0- 3
CH1- 4
CH1+ 5
CH2+ 6
CH2- 7
CH3- 8
CH3+ ₉
CH4+ 10
CH4- 11
CH5- 12
CH5+ ₁₃
REFIN/OUT+ 14
28 DV_DD
27 RESET
26 SDI
25 SDO
24 SCK
23 ^CS
22 OSC2
21 OSC1
20 DRC
19 DRB
18 DRA
17 DGND
16 AGND
15 REFIN-
© 2011 Microchip Technology Inc.
DS25048B-page 1