MCP1501 datasheet(17/36 Pages) MICROCHIP

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 2015-2016 Microchip Technology Inc.

DS20005474C-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. The fundamental building block (see Block Dia-

gram) of the MCP1501 is an internal bandgap refer-

ence circuit. As with all bandgap circuits, the internal

reference sums together two voltages having an oppo-

site temperature coefficient which allows a voltage ref-

erence

that

practically

independent

from

temperature.

The bandgap of the MCP1501 is based on a second

order temperature coefficient (TC) compensated band-

gap circuit that allows the MCP1501 to achieve high ini-

tial accuracy and low temperature coefficient operation

across supply and ambient temperature. The bandgap

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 opera-

tion, further reduces temperature dependent offsets

that would otherwise increase the temperature coeffi-

cient 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 bandgap voltage is compensated, it is ampli-

fied, buffered, and provided to the output drive circuit

which has excellent performance when sinking or

sourcing load currents (±5 mA).

MCP1501 Datasheet(PDF) 17 Page - Microchip Technology