TDA4482-D

TDA4482-D Quasi-Parallel Sound Processor for TV Sets Technology: Bipolar Features D High signal sensitivity D Simple filter configuration and few external components D Processing of two carrier stereo signals D ESD protected D Low intercarrier distortions D D D D Alignment-free intercarrier mixer Optimum tuning characteristics Improved linearity for NICAM applications AF output level matched to SIMAVELEC condition Case: DIP18 Block Diagram Figure 1. TELEFUNKEN Semiconductors Rev. A1, 29-Aug-96 1 (7) TDA4482-D Pin Configuration Pin 1–2 3 4 5 6 7–8 9 Function Vision-IF-carrier input Intercarrier input 5.74 MHz AGC storage capacitor Intercarrier output 5.74 MHz AF output 1 FM demod circuit 5.74 MHz Ground Pin 10–11 12 13 14 15 16–17 18 Function FM-demode circuit 5.5 MHz AF output 2 Intercarrier output 5.5 MHz Supply voltage Intercarrier input 5.5 MHz Sound-IF-carrier input Not conneccted Circuit Description This circuit configuration permits high-quality processing of audio carriers for FM-sound standards, providing separate inputs for the video and audio carrier. The audio carrier signal is passed to two multiplying mixer arrangements via a 3-stage variable wideband amplifier with led level output signals. One mixer generates the gain-control signal. The second mixer operates as an intercarrier demodulator and supplies the intermediate AF carrier. The video carrier signal required from the intercarrier is decoupled in a prelimited and selected form from the demodulato...