108

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