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| 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 voltage converter is a circuit designed for generating the negative voltage (-VDD) from the positive power supply (VDD). Because the voltage efficiency is 85% (TYP.), the negative voltage (-VDD x 0.85) is output typically. This converter uses the charge pumping system which consists of capacitors and switches. VDD GND = 0V VOUT = -VDD VDD 2 x VDD * Operational Amplifier As the input and the feedback resistor of the operational amplifier is incorporated, an uni-multiple inverting amplifier is constructed. * Stand-by Function The NJU7664 turns to the stand-by mode when the STB terminal level is set to "L". During the stand-by mode, the voltage converter outputs GND voltage and the the operating current is lower as the oscillator stop operating. -2- Ver.2003-07-18 NJU7664 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Input Voltage Output Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL VDD VIN VOUT PD Topr Tstg RATINGS 5.5 GND -0.5 to VDD + 0.5 -5.0 320 -30 to + 85 -40 to +125 (Ta = 25C) UNIT V V V mW C C Note1) Decoupling capacitor should be connected between VDD and GND due to the stabilized operation for the voltage converter. ELECTRICAL CHARACTERISTICS *DC CHARACTERISTICS PARAMETER Operating Voltage Operating Current SYMBOL VDD IDD1 IDD2 IDD3 High Level Input Voltage Low Level Input Voltage Input Current 1 Oscillation Frequency Input Voltage VIH VIL IIN1 fOSC VIN VIN1, VIN2 Terminals VDD = 2.7V VDD = 5.2V VDD = 2.7V VIN = 2.0V VDD = 5.2v VIN = 4.0V VDD = 2.7V ISI = -100A VDD = 2.7V ISI = -100A ISI1 = -100A, ISI2 = -1A No load STB = L STB terminal STB terminal STB terminal, Vi = VDD or GND (VDD = 2.7V, GND = 0V, Ta = 25C) CONDITIONS MIN. 2.7 0.8VDD GND 0 0 -2.0 -4.0 5.0 -10 4.0 0.4 0.4 TYP. MAX. 5.2 1.25 1.0 1.0 VDD 0.2VDD 1.0 2.0 4.0 10.0 20.0 0 0 -100 -105 10 UNIT V mA mA A V V A MHz V V A A V V A A A mV mV % Input Current 2 O P A M P Output Voltage Output Source Current Output Sink Current Output Ripple Current Gain Error IIN2 VIN1, VIN2 Terminals VOUT ISO ISI ISITOTAL VRR1 VRR2 GER VOUT1, VOUT2 Terminals VOUT1, VOUT2 Terminals VOUT1, VOUT2 Terminals Total of VOUT1, VOUT2 Term. ISI = -100A, CL = 0.1F ISI = -5A, CL = 0.1F Ver.2003-07-18 -3- NJU7664 APPLICATION CIRCUITS [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. -4- Ver.2003-07-18 |
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