Dual Digital BTSC Encoder with Integrated DAC
Rochester Electronics is the only authorized source of Analog Devices' products that have previously been discontinued or have become obsolete. Product availability should be checked directly with Rochester Electronics.
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.
In addition to the BTSC encoders, the AD71028 also includes a stereo image enhancement function, Phat Stereo, to increase the sense of spaciousness available from closely spaced TV loudspeakers. A dialog enhancement algorithm is also included to solve the problem of playing wide dynamic range sources over limited-performance TV speakers and amplifiers. An extensive SPI port allows click-free parameter updates. The AD71028 also includes ADI’s patented multibit Σ-Δ DAC architecture. This architecture provides 92 dB SNR and THD+N of -92 dB.