22192d - MCP3901 Two-Channel Analog Front End Features Two...

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© 2011 Microchip Technology Inc. DS22192D-page 1 MCP3901 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 OSC1/CLKI 1 2 3 4 20 19 18 17 16 15 14 13 5 6 7 8 OSC2 SDI RESET DV DD AV DD CH0+ CH0- CH1- 12 9 DGND MDAT0 MDAT1 DR CH1+ AGND SDO 11 10 REFIN/OUT+ REFIN- CS SCK 20-Lead SSOP 5 2 EP 20 1 19 18 17 3 4 15 14 13 12 6 7 8 9 21 10 11 16 CH0+ CH0- CH1- CH1+ AGND REFIN- REFIN/OUT+ DGND MDAT1 MDAT0 OSC1/CLKI OSC2 DR CS SCK SDO SDI RESET DV DD AV DD 20-Lead QFN * Includes Exposed Thermal Pad (EP); see Table 3-1 . Two-Channel Analog Front End
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