MCP1502 datasheet(15/28 Pages) MICROCHIP

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DS20006593A-page 15

MCP1502

4.0

THEORY OF OPERATION

The MCP1502 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 details of the

MCP1502. 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.

MCP1502 band gap is based on a second-order

temperature compensated circuit. This allows the

MCP1502 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 MCP1502 also includes a chopper-based amplifier

architecture that ensures excellent low noise operation,

which further reduces temperature-dependent offsets

that would otherwise increase the temperature

coefficient of the MCP1502, 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).

MCP1502 Scheda tecnica(PDF) 15 Page - Microchip Technology