MCP1502 datasheet(16/28 Pages) MICROCHIP

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MCP1502

DS20006593A-page 16

 2021 Microchip Technology Inc. and its subsidiaries

5.0

APPLICATION CIRCUITS

5.1

Application Tips

5.1.1

BASIC APPLICATION CIRCUIT

Figure 5-1 illustrates a basic circuit configuration of the

MCP1502.

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

shown in Figure 5-5, the input voltage is connected to

the device at the VDD 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 capaci-

tor 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 frequencies above 2 MHz will be

beyond the bandwidth of the voltage reference, and

consequently, not transmitted from the input pin

through the device to the output.

If the noise at the output of the voltage references is too

high for the particular application, it can be easily filtered

with an external RC filter and op amp buffer (see

Figure 5-2).

FIGURE 5-2:

Output Noise Reducing Filter.

The RC filter values are selected for a desired cutoff

frequency, as shown in Equation 5-1.

EQUATION 5-1:

The values that are shown in Figure 5-5 (1 kΩ

 and

10 μF) will create a first-order, low-pass filter at the out-

put of the amplifier. The cutoff frequency of this filter is

15.9 Hz, and the attenuation slope is 20 dB/decade.

The MCP6286 amplifier isolates the loading of this low-

pass filter from the remainder of the application circuit.

This amplifier also provides additional drive with a

faster response time than the voltage reference.

VDD

SHDN

GND

OUT

GND

0.1-2.2 μF

1.65-5.5V

OUT

MCP1502

0-10 nF(1)

6-Lead SOT-23

1 nF-10 μF(2)

Note 1: With no series resistance.

2: With RS = 100Ω and 1 kΩ to ground.

 R1 C1





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