MCP1501 datasheet(21/36 Pages) MICROCHIP

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DS20005474C-page 21

MCP1501

5.2

Typical Applications Circuits

5.2.1

NEGATIVE VOLTAGE REFERENCE

A negative voltage reference can be generated using

any of the devices in the MCP1501 family. A typical

application is shown in Figure 5-3. In this circuit, the

voltage inversion is implemented using the MCP6061

and two equal resistors. The voltage at the output of the

MCP1501 voltage reference drives R1, which is con-

nected to the inverting input of the MCP6061 amplifier.

Since the non-inverting input of the amplifier is biased

to ground, the inverting input will also be close to

ground potential. The second 10 kΩ

resistor is placed

around the feedback loop of the amplifier. Since the

inverting input of the amplifier is high-impedance, the

current generated through R1 will also flow through R2.

As a consequence, the output voltage of the amplifier

is equal to -2.5V for the MCP1501-25 and -4.096V for

the MCP1501-40.

FIGURE 5-3:

Negative Voltage Reference.

5.2.2

A/D CONVERTER REFERENCE

The MCP1501 product family was carefully designed to

provide a precision, low noise voltage reference for the

Microchip families of ADCs. The circuit shown in

Figure 5-4 shows a MCP1501-25 configured to provide

the reference to the MCP3201, a 12-bit ADC.

FIGURE 5-4:

ADC Example Circuit.

VDD

SHDN

GND

OUT

GND

2.2 µF

2.7 – 5.5V

1kΩ

10 kΩ

0.1%

10 kΩ

0.1%

-5V

-2.500V

MCP1501-25

MCP6061

2.2 µF

VDD

SHDN

GND

OUT

GND

2.2 µF

5.0V

2.2 µF

MCP1501-25

MCP3201

5.0V

10 µF

VREF

VIN

0.1 µF

IN+

IN-

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