MCP1501 datasheet(19/36 Pages) MICROCHIP

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DS20005474C-page 19

MCP1501

5.0

APPLICATION CIRCUITS

5.1

Application Tips

5.1.1

BASIC APPLICATION CIRCUIT

Figure 5-1 illustrates a basic circuit configuration of the

MCP1501.

FIGURE 5-1:

Basic Circuit Configuration.

An output capacitor is not required for stability of the

voltage reference, but may be optionally added to pro-

vide noise filtering or act as a charge-reservoir for

switching loads, e.g., successive approximation regis-

ter (SAR) analog-to-digital converter (ADC). As shown,

the input voltage is connected to the device at the VIN

input, with an optional 2.2 μf ceramic capacitor. This

capacitor would be required if the input voltage has

excessive noise. A 2.2 μf capacitor would reject input

voltage noise at approximately 1 to 2 MHz. Noise

below this frequency will be amply rejected by the input

voltage rejection of the voltage reference. Noise at fre-

quencies above 2 MHz will be beyond the bandwidth of

the voltage reference and, consequently, not transmit-

ted from the input pin through the device to the output.

If the noise at the output of these voltage references is

too high for the particular application, it can be easily fil-

tered with an external RC filter and op-amp buffer (see

Figure 5-2).

FIGURE 5-2:

Output Noise-Reducing

Filter.

VDD

SHDN

GND

SOIC-8/DFN-8

GND

OUT

GND

0.1 – 2.2 µF

1.65 – 5.5V

1kΩ

OUT

RFIL

FIL

Output

of V

REF

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