MCP1501 datasheet(20/36 Pages) MICROCHIP

20 / 36 page

MCP1501

DS20005474C-page 20

 2015-2016 Microchip Technology Inc.

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 5-2 (10 kΩ

 and

1 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 MCP6021 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.

5.1.2

LOAD CAPACITOR

The output capacitor from OUT to GND acts as a

low-pass noise filter for the references and should not

be omitted. The maximum capacitive load is 300 pF,

however, larger capacitors may be implemented if a

resistor is used in series with a larger load capacitor.

Figure 5-1 illustrates a 1 kΩ resistor in series with a

2.2 µF capacitor.

5.1.3

PRINTED CIRCUIT BOARD LAYOUT

CONSIDERATIONS

Mechanical stress due to Printed Circuit Board (PCB)

mounting can cause the output voltage to shift from its

initial value. Devices in the SOT-23-6 package are gen-

erally more prone to assembly stress than devices in

the WDFN package. To reduce stress-related output

voltage shifts, mount the reference on low-stress areas

of the PCB (i.e., away from PCB edges, screw holes

and large components).

 R

FILCFIL



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MCP1501 Datasheet(PDF) 20 Page - Microchip Technology