MCP3909-I/SP Microchip Technology, MCP3909-I/SP Datasheet - Page 15

• Manufacturer Part Number: MCP3909-I/SP
• Description: Power Meter with SPI and Active Power Pulse Output & Internal Oscillator., -40C to +85C, 28-SPDIP, TUBE
• Manufacturer: Microchip Technology

3.15
D
circuitry (SINC filters, multiplier, HPF, LPF, digital-to-
frequency converter and oscillator). To ensure
accuracy and noise cancellation, D
connected to the same ground as A
with a star connection. If a digital ground plane is
available, it is recommended that this device be tied to
this plane of the Printed Circuit Board (PCB). This
plane should also reference all other digital circuitry in
the system.
3.16
HF
supplies the instantaneous real-power information. The
output is a periodic pulse output, with its period propor-
tional to the measured real power, and to the HF
constant defined by F0, F1 and F2 pin logic states. This
output is the preferred output for calibration due to
faster output frequencies, giving smaller calibration
times. Since this output gives instantaneous real
power, the 2ω ripple on the output should be noted.
However, the average period will show minimal drift.
© 2006 Microchip Technology Inc.
GND
OUT
is the ground connection to internal digital
is the high-frequency output of the device and
Ground Connection (D
High-Frequency Output (HF
GND
GND
GND
, preferably
)
must be
OUT
)
C
3.17
F
device that supply the average real-power information.
The outputs are periodic pulse outputs, with its period
proportional to the measured real power, and to the F
constant, defined by F0 and F1 pin logic states. These
pins include high-output drive capability for direct use
of electromechanical counters and 2-phase stepper
motors. Since this output supplies average real power,
any 2ω ripple on the output pulse period is minimal.
OUT0
and F
Frequency Output (F
OUT1
are the frequency outputs of the
MCP3909
OUT0
DS22025A-page 15
, F
OUT1
)
C