PRODUCT OVERVIEW
The AD71028 dual digital BTSC encoder provides two complete digital BTSC encoder channels, including the pilot-tone generation and subcarrier mixing functions. Two built-in high performance DACs are provided to output the BTSC baseband composite signal. The output of the AD71028 can be connected with minimal external circuitry to the input of a 4.5 MHz aural FM modulator.

FEATURES
   2 complete independent BTSC encoders
   Pilot tone generator
   Includes subcarrier modulation
   Typical 23 dB to 27 dB separation, 16 dB minimum
   Signal bandwidth of 14 kHz
   Phat-StereoTM algorithm for stereo image enhancement
   Dialog enhancement function for playing wide dynamic
      range video sources over built-in TV speakers
   Includes L-R dual-band compressor
   SPI® port for control of modes and effects
   Differential output for optimum performance
   DAC performance: 92 dB dynamic range, –92 dB THD+N
   Output level control for setting aural carrier deviation
   Flexible serial data port with right-justified, left-justified,
   I2S compatible, and DSP serial port modes
   48-lead LQFP plastic package

APPLICATIONS
   Digital set-top box BTSC encoder