MCP1541 datasheet(10/20 Pages) MICROCHIP

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MCP1525/41

DS21653B-page 10

4.2

Typical Application Circuits

4.2.1

NEGATIVE VOLTAGE REFERENCE

A negative precision voltage reference can be

generated by using the MCP1525 or MCP1541 in the

configuration shown in Figure 4-3.

FIGURE 4-3:

Negative Voltage

Reference.

In this circuit, the voltage inversion is implemented

using the MCP606 and two equal resistors. The voltage

at the output of the MCP1525 or MCP1541 voltage

reference drives R1, which is connected to the inverting

input of the MCP606 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 k

Ω 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

MCP1525 and -4.1V for the MCP1541.

4.2.2

A/D CONVERTER REFERENCE

The MCP1525 and MCP1541 were carefully designed

to provide a voltage reference for Microchip’s 10-bit

and 12-bit families of ADCs. The circuit shown in

Figure 4-4 shows a MCP1541 configured to provide the

reference to the MCP3201, a 12-bit ADC.

FIGURE 4-4:

ADC Reference Circuit.

VSS

VOUT

VIN

MCP1525

MCP1541

10 µF

10 k

VDD =5.0V

VREF

MCP606

VSS = - 5.0V

0.1%

10 k

0.1%

VREF =-2.5V, MCP1525

VREF = -4.096V, MCP1541

VSS

VOUT

VIN

VDD =5.0V

CIN

0.1 µF

MCP3201

10 µF

VREF

IN+

IN–

VIN

10 µF

0.1 µF

to PICmicro®

Microcontroller

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