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MCP3302 bảng dữ liệu(PDF) 16 Page - Microchip Technology

tên linh kiện MCP3302
Giải thích chi tiết về linh kiện  13-Bit Differential Input, Low Power A/D Converter with SPI Serial Interface
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MCP3302/04
DS21697E-page 16
© 2008 Microchip Technology Inc.
3.7
Analog Ground (AGND)
Ground connection to internal analog circuitry. To
ensure accuracy, this pin must be connected to the
same ground as DGND. If an analog ground plane is
available, it is recommended that this device be tied to
the analog ground plane in the circuit. See Section 5.6
“Layout
Considerations”
for more information
regarding circuit layout.
3.8
Voltage Reference (VREF)
This input pin provides the reference voltage for the
device, which determines the maximum range of the
analog input signal and the LSB size.
The LSB size is determined according to the equation
shown below. As the reference input is reduced, the
LSB size is reduced accordingly.
EQUATION 3-1:
When using an external voltage reference device, the
system
designer
should
always
refer
to
the
manufacturer’s recommendations for circuit layout.
Any instability in the operation of the reference device
will have a direct effect on the accuracy of the ADC
conversion results.
3.9
Power Supply (VDD)
The voltage on this pin can range from 2.7 to 5.5V. To
ensure accuracy, a 0.1 µF ceramic bypass capacitor
should be placed as close as possible to the pin. See
Section 5.6
“Layout
Considerations”
for more
information regarding circuit layout.
LSB Size =
2 x VREF
8192



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