The BA1330 is a monolithic integrated circuit consisting of an FM stereo demodulator using phase-locked loop techniques to derive the right and left audio channels from a composite signal. It was designed with ample consideration given to use in battery operated stereo radio cassette recorders and operates stably at supply voltages as low as 3.6 volts, by virtue of an internally regulated voltage supply. To prevent unstable operation when power is applied and to avoid S/N deterioration when switching to the stereo mode with and almost-dead battery, VCO automatically stops at a voltage of typically 3.6 volts or more. In addition, to a VCO oscillation inhibiting terminal (pin 9), built-in hysteresis is provided to stop oscillation during AM reception or forced monaural operation by means of the IF level. A separation control pin (pin-8) is also provided to obtain stable separation without the need for input compensation.
