PDF LA75691 Data sheet ( Hoja de datos )

Número de pieza	LA75691
Descripción	IF Signal-Processing IC
Fabricantes	Sanyo Electric
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No Preview Available ! Ordering number : EN5734 Monolithic Linear IC LA75691 IF Signal-Processing IC for PAL/NTSC Multichannel Audio TV and VCR Systems Overview The LA75691 is a PAL/NTSC multichannel audio VIF/SIF signal-processing IC that makes the minimum number of adjustments possible. The system is designed so that VCO adjustment makes AFT adjustment unnecessary, thus simplifying the adjustment steps in end- product manufacturing. PLL detection is adopted in the FM detector, allowing the LA75691 to support multichannel detection for the audio signal. In addition, it also incorporates a buzz canceller that suppresses Nyquist buzz for improved audio quality. Functions [VIF Block] • PLL detector with minimum number of adjustments • AFT • Equalizer amplifier • RF AGC [First SIF BLOCK] • First SIF detector • HPF [SIF Block] • PLL-based FM detector [Muting Block] • AV muting Package Dimensions unit: mm 3067-DIP24S [LA75691] SANYO: DIP24S Features • Excellent buzz and buzz/beating characteristics provided by a PLL detection technique that includes a buzz canceller. • The second IF AGC filter is built in. • No coils are used in the AFT and SIF circuits, making them adjustment free. Ambient temperature, Ta — °C Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein. SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 90898RM (OT) No. 5734-1/13 1 page NT (US) INTER LA75691 No. 5734-5/13 5 Page Continued from preceding page. Pin No. Pin LA75691 Function Equivalent circuit This filter is used to hold the FM detector output DC voltage fixed. 23 FM filter Normally, a 1-µF electrolytic capacitor should be used. The value of this capacitor can be increased to improve the low band (around 50 Hz) frequency characteristics. Audio FM detector output This is an emitter follower output with a 200-Ω resistor inserted in series. • Stereo applications Some applications may find that the stereo decoder input has a low input impedance, and that the left and right signals are distorted, i.e. that the stereo characteristics are degraded. If 24 FM Detector output that is a problem, add the resistor R1 shown in the figure between pin 24 and ground. R1 ≥ 5.1 kΩ • Mono applications Use an external deemphasis circuit with the following time constant: t = 2RC No. 5734-11/13 11 Page

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