A7303B Final Version FM Stereo Transmitter Typical Applications FM stereo audio transmission. Features .Stereo MPX. .Programmable RF phase locked loop with integrated VCO. .No need Darlington transistor for loop filter. .RF frequency set by dip switch. 14 even channels, 14 odd channels available. .Operating voltage from 2.5 to 3.6V. .Battery save mode. .32-lead plastic QFN5X5 packaging.