TC7106A7107A的±5V电源操作

TheTC7106A/71063-1/2digitanalog-to-digital(ADC)

converterswithliquidcrystaldisplaydrivecanbeeasily

poweredfrom±5Vpowersupplies.Lowcostvoltage

regulators,suchastheTC55(+5V)andTC59(–5V),

powertheTC7106A/7106inFigure1.Analogcom-

mon,internallyreferencedto3Vbelowthepositive

supplypotential,isusedtosupplytheconverter

reference.

Ifonly+5Visavailable,thelowcostTC7660DC-to-DC

convertereasilygeneratesthe–5Vsupply,asshownin

Figure2.ATC7107A/7107LEDdisplayconvertercan

alsobepoweredbyaTC7660.MAN783±5VPowerSupplyOperationwithTC7106A/7107AAnexternalvoltagereferencereplacestheinternalref-Author:MicrochipTechnologyInc.erenceinFigure3.ChiptemperaturevariationscausedbychangingLEDdisplaydrivecurrentcancausefull-INTRODUCTIONscaledriftiftheinternalreferencedoesnothavealowtemperaturecoefficient.In