MCP621 datasheet(21/68 Pages) MICROCHIP

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DS20002188E-page 21

MCP621/1S/2/3/4/5/9

3.1

Analog Outputs

The analog output pins (VOUT) are low-impedance

voltage sources.

3.2

Analog Inputs

The noninverting and inverting inputs (VIN+, VIN–, …)

are high-impedance CMOS inputs with low bias

currents.

3.3

Power Supply Pins

The positive power supply (VDD) is 2.5V to 5.5V higher

than the negative power supply (VSS). For normal

operation, the other pins are between VSS and VDD.

Typically, these parts are used in a single (positive)

supply configuration. In this case, VSS is connected to

ground and VDD is connected to the supply. VDD will

need bypass capacitors.

3.4

Calibration Common Mode

Voltage Input

A low-impedance voltage placed at this input (VCAL)

will set the op amps’ Common mode input voltage

during calibration. If this pin is left open, the Common

mode input voltage during calibration is approximately

VDD/3. The internal resistor divider is disconnected

from the supplies whenever the part is not in

calibration.

3.5

Calibrate/Chip Select Digital Input

This input (CAL/CS, …) is a CMOS, Schmitt-triggered

input that affects the Calibration and Low-Power

modes of operation. When this pin goes high, the part

is placed into a Low-Power mode and the output is

High Z. When this pin goes low, a calibration sequence

is started (which corrects VOS). At the end of the cali-

bration sequence, the output becomes low-impedance

and the part resumes normal operation.

An internal POR triggers a calibration event when the

part is powered-on, or when the supply voltage drops

too low. Thus, the MCP622 parts are calibrated, even

though they do not have a CAL/CS pin.

3.6

Exposed Thermal Pad (EP)

There is an internal connection between the Exposed

Thermal Pad (EP) and the VSS pin; they must be

connected to the same potential on the Printed Circuit

Board (PCB).

This pad can be connected to a PCB ground plane to

provide a larger heat sink. This improves the package

thermal resistance (

JA).

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