MCP1501 datasheet(17/39 Pages) MICROCHIP

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DS20005474G-page 17

MCP1501

4.0

THEORY OF OPERATION

The MCP1501 is a buffered voltage reference that is

capable of operating over a wide input supply range

while providing a stable output across the input supply

range. Refer to the Block Diagram for the detail of the

MCP1501. As with all band gap circuits, the internal

reference sums together two voltages having an

opposite temperature coefficient which allows a voltage

reference that is practically independent from

temperature.

MCP1501 band gap is based on a second order

temperature compensated circuit. This allows the

MCP1501 to achieve high initial accuracy and low

temperature coefficient operation across voltage and

temperature. The band gap curvature compensation is

determined during device characterization and is

trimmed for optimal accuracy.

The MCP1501 also includes a chopper-based amplifier

architecture

that

ensures

excellent

low-noise

operation, further reduces temperature dependent

offsets that would otherwise increase the temperature

coefficient of the MCP1501, and significantly improves

long-term drift performance. Additional circuitry is

included to eliminate the chopping frequency from the

output of the device.

After the band gap voltage is compensated, it is

attenuated, buffered and provided to the output drive

circuit. The device has excellent performance when

sinking or sourcing load currents (±20 mA).

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