ASM51

que a microchip ta mexendo com isso>:

http://ww1.microchip.com/downloads/en/D ... 22192b.pdf

muito interessante, e barato bagarai..

Acho que o link não está funcionando.

MCP3901

• 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 35th 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 AVDD, 2.7V - 5.5V DVDD
• Low Power consumption: (14 mW typical at 5V)
• Available in small 20-lead SSOP package
• Industrial Temperature Range: -40°C to +85°C


MCP3901
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,
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.


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