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Microchip Technology Inc has
launched its next generation
energy measurement
analog front end (AFE),
the MCP3911, which features two
24-bit, delta-sigma ADCs that
operate at 3V with industry-leading
accuracy of 94.5 dB SINAD and 106.5
dB THD. This provides better
energy-meter and power-monitoring
performance by accurately measuring
from start-up to maximum
current, and enables faster calibration
during production. Four different
power modes offer the flexibility of
enabling either extremely low-power
designs, to 0.8mA per channel, or
designs for higher-speed signals and
harmonic content. The extended
temperature range allows operation
from -40°C to +125°C.
The MCP3911 also features 2.7V
to 3.6V analog and digital
operation, which simplifies the
interface by running off the same
power rail as the microcontroller.
An internal, low-temperature-coefficient
voltage reference, along
with PGAs on each channel, enables
metering and monitoring designs.
As the global energy-metering
infrastructure is being upgraded
and the power-monitoring market
is growing, designers of energy measurement
and other signal acquisition
applications are looking
for ways to increase performance
while lowering costs.
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