NJU7664

www.DataSheet4U.com NJU7664 VOLTAGE CONVERTER FOR GaAs FET ■ GENERAL DESCRIPTION The NJU7664 is a voltage converter for GaAs FET, which contains CR oscillation circuit and dual operational amplifiers. The voltage converter is a circuit operated by the charge pumping system, and it generates the negative voltage from the positive power supply. Furthermore the charge pumping capacitor is incorporated. Both of two operational amplifiers with the gain resistance which is set up at -OdB output the negative voltage by the inverted input voltage. The NJU7664 realizes to operate the GaAs FET requiring the negative gate biassing. ■ PACKAGE OUTLINE PRELIMINARY NJU7664R ■ FEATURES Voltage Converter Operated With The Charge Pumping System Charge Pump Capacitor Incorporated CR Oscillation Circuit Incorporated Wide Operating Voltage VDD = 2.7V to 5.2V Output Voltage 0 to -4.0V (VDD = 5.2V) Low Operating Current 1.25mA MAX(VDD = 2.7V) Stand-by Function C-MOS Technology Package Outline VSP-8 ■ PIN CONFIGURATION ■ BLOCK DIAGRAM Ver.2003-07-18 -1- NJU7664 ■ TERMINAL DESCRIPTION No. 1 2 3 4 5 6 7 8 SYMBOL STB FUNCTION Stand-by input terminal H : oscillating L : stop oscillating Positive voltage input terminal 1 No connection (Electrically open) Negative voltage output terminal 1 Ground terminal Negative voltage output terminal 2 Positive voltage input terminal 2 Power supply terminal VIN1 NC VOUT1 GND VOUT2 VIN2 VDD ■ FUNCTIONAL DESCRIPTION Voltage Converter The ...