The AD1970 is a complete analog or digital-in, analog-out BTSC encoder which includes pilot-tone generation and subcarrier mixing functions. The stereo ADC provides the means for digitization of the analog baseband audio signal. A built-in high performance DAC is provided to output the BTSC baseband composite signal. The output of the AD1970 can be connected with minimal external circuitr y to the input of a 4.5 MHz aural FM modulator.