MCP3302 datasheet(16/46 Pages) MICROCHIP

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MCP3302/04

DS21697E-page 16

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

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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