BA7042

Optical disc ICs VCO with sensitivity adjustment function BA7042 The BA7042 is a monolithic IC comprising a VCO (voltage controlled oscillator) with sensitivity adjusting capabilities. The oscillation frequency can be set with an external constant, and is controlled according to the control voltage. The BA7042 can be used to produce high-modulation-factor FM signals by superimposing its control voltage with AC signals, and to configure a PLL circuit just by attaching a frequency divider and a phase comparator. FApplications FM intercom FM wireless microphone FSK modem FFeatures 1) The number of external components is minimized. 2) Internal control amplifier for the VCO. 3) Oscillation frequency can be set with an external constant. 4) Maximum oscillation frequency of 18MHz. 5) DIP 8-pin package. FBlock diagram 108 Optical disc ICs FAbsolute maximum ratings (Ta = 25_C) BA7042 FRecommended operating conditions FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC=5.0V) 109 Optical disc ICs FMeasurement circuit BA7042 FApplication example 110 Optical disc ICs FCircuit operation (1) Circuit configuration The control voltage, input through pin 1, is amplified by the control amplifier, then output to pin 7 and input to the VCO control circuit. The oscillation frequency of the VCO is determined by the attached capacitor and controlled according to the control voltage. Highly modulated FM signals can be produced by superimposing the control voltage with ...