AN7354SC

ICs for Cassette, Cassette Deck AN7354SC Dolby* B/C-type Noise Reduction s Overview The AN7354SC is an IC for 2 ch. Dolby B/C-Type noise reduction process. It requires fewer external parts and incorporates the functions of line-output muting and level detection and the delay circuit. 0.45 Unit : mm 1 42 skewing circuit not requiring external parts Line-output muting circuit built-in PB input delay circuit built-in Built-in level detection circuit for automatic level adjustment and level meter ON/OFF of NR, B-/C-type, REC./PB, MPX and muting function, and Hi/Lo changeover of level detection gain, directly-controllable by microcomputer 0.1±0.1 1.0 21 22 2.0±0.2 REC. OUT 1500pF 0.47µF 24 + 23 9.5±0.3 11.5±0.3 * Dolby symbols are the trademarks of Dolby Laboratory Licensing Corporation. The use of this products requires the approval of Dolby Laboratories Licensing Corporation in advance. 42-Lead SSOP Package (SSOP042-P-0450) s Block Diagram VCC REC. IN PB IN 1500pF 5.6kΩ MPX 2.4kΩ REC. /PB MPX METER OFF/ 0dB ON /20dB + 2.2µF 0.1µF + 1µF + LINE OUT 100kΩ LEVEL METER OUT 1500pF 0.47µF 1µF + 42 41 1µF + 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 + 25 0.15 0.9 0.3 21.25±0.3 22 SS HLS LLS SS HLS LLS 15 16 17 0.47µF 18 + 19 0.47µF 20 + 21 LINE OUT 1500pF LEVEL METER OUT 1500pF REC. OUT s Features Built-in spectral Delay Mute Rect Bias LOGIC Rect Delay Mute 1 + 1µF 2 22kΩ 3 + 1µF 4 5 6 7 2.4kΩ 8 9 10 11 + 12 0.1µF 13...