MCP3903 Six Channel Delta Sigma A/D Converter Features Description Six Synchronous Sampling 16/24-bit Resolution The MCP3903 is a six-channel Analog Front End (AFE) Delta-Sigma A/D Converters with Proprietary containing three pairs made out of two synchronous Multi-Bit Architecture sampling Delta-Sigma Analog-to-Digital Converters (ADC) with PGA, a phase delay compensation block, 91 dB SINAD, -100 dBc Total Harmonic Distortion th internal voltage reference, and high-speed 10 MHz SPI (THD) (up to 35 harmonic), 102 dB Spurious-free compatible serial interface. The converters contain a Dynamic Range (SFDR) for Each Channel proprietary dithering algorithm for reduced idle tones Programmable Data Rate up to 64 ksps and improved THD. Ultra Low-Power Shutdown Mode with <2 A The internal register map contains 24-bit wide ADC -115 dB Crosstalk Between any Two Channels data words, a modulator output register as well as six Low Drift Internal Voltage Reference: 5 ppm/C 24-bit writable control registers to program gain, Differential Voltage Reference Input Pins over-sampling ratio, phase, resolution, dithering, High Gain PGA on Each Channel (up to 32 V/V) shut-down, reset and several communication features. Phase Delay Compensation Between Each Pair The communication is largely simplified with various of Channels with 1 s Time Resolution Continuous Read modes that can be accessed by the High-Speed Addressable 10 MHz SPI Interface Direct Memory Access (DMA) of an MCU and with with Mode 0,0 and 1,1 Compatibility separate Data Ready pins that can directly be connected to the Interrupt Request (IRQ) input of an Independent Analog and Digital Power Supplies 4.5V - 5.5V AV , 2.7V - 3.6V DV MCU. The MCP3903 is capable of interfacing to a large DD DD variety of voltage and current sensors including shunts, Available in Small 28-lead SSOP Package current transformers, Rogowski coils, and Hall-effect Extended Temperature Range: -40C to +125C sensors. Applications Package Type Energy Metering and Power Measurement 28-Lead SSOP Portable Instrumentation Medical and Power Monitoring AV 1 28 DV DD DD 2 27 RESET CH0+ CH0- 3 26 SDI CH1- 4 25 SDO SCK CH1+ 5 24 CS CH2+ 6 23 CH2- OSC2 7 22 CH3- 21 OSC1 8 CH3+ DRC 9 20 CH4+ 10 19 DRB CH4- DRA 11 18 CH5- 12 17 DGND CH5+ AGND 13 16 REFIN/OUT+ 14 15 REFIN- 2011 Microchip Technology Inc. DS25048B-page 1MCP3903 Functional Block Diagram AV DV DD DD REFIN/OUT+ Voltage VREFEXT AMCLK Xtal Oscillator OSC1 Reference MCLK Clock + Generation V OSC2 REF DMCLK/DRCLK - REFIN - ANALOG DIGITAL V - V + REF REF DMCLK OSR<1:0> PRE<1:0> 3 SINC CH0+ DATA CH0<23:0> + CH0- - PGA - Modulator Phase PHASEA <7:0> DRA Shifter CH1+ DATA CH1<23:0> + CH1- - 3 PGA - SINC Modulator DUAL DS ADC 3 SINC CH2+ DATA CH2<23:0> + CH2- - PGA - Modulator Phase PHASEB <7:0> Shifter DRB Digital SPI Interface CH3+ DATA CH3<23:0> + CH3- - 3 PGA - SINC Modulator DUAL DS ADC 3 SINC CH4+ DATA CH4<23:0> + CH4- - PGA - Modulator DRC Phase PHASEC <7:0> Shifter SDO CH5+ DATA CH5<23:0> + CH5- - RESET 3 PGA - SINC SDI Modulator SCK CS DUAL DS ADC POR POR AV DD Monitoring AGND DGND DS25048B-page 2 2011 Microchip Technology Inc.