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LA1145M データシート(PDF) 11 Page - Sanyo Semicon Device |
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LA1145M データシート(HTML) 11 Page - Sanyo Semicon Device |
11 / 17 page Soft Mute Characteristics 1. Control The S/N setting (C/N) for weak inputs and the –3 dB limiting sensitivity can be controlled by obtaining the proper value for the un-soft muted input/output signal characteristic. However, usable sensitivity cannot be controlled as this is determined by the front end and IF design which are unrelated to soft muting. 2. Soft mute setting Soft mute operation depends on the S-meter circuit voltage and the hole detection circuit voltage. As shown in the graph on the right, the degree of soft muting correlates with the mute drive voltage, V15. The control signal line of the mute drive voltage switches before and after the 10 dBµ ANT divergence point. When adjusting the soft mute with a weak signal which does not affect the S-meter, first adjust it using the hole detection input signal. However, as the S-meter output will readjust the soft mute level, also adjust the soft mute using the S-meter output. At this point, the hole detection output adjusts the gain up to the IF input, causing a variance. Also, the S-meter output is varied by the value of R16. The LA1145 differs from the LA1140 in that it works with the internal soft mute circuit continuously engaged. 3. Soft mute transition response characteristic The degree of soft muting automatically varies according to the change in input field strength. Omitting the influence of the front end wideband AGC circuit, the LA1145’s response speed is dependent on the time constant at pins 15 and 16. Hole detector S-meter (Adjust R4, R5) ANT input level (dBµ) I/O Characteristics (RCT =0 Ω) IF input level, – dBµ Mute Driver Voltage Characteristics IF input level – dBµ I/O Characteristics (Mute Start Point) ANT input level – dBµ I/O Characteristics (Mute Gradient) ANT input level – dBµ LA1145, 1145M No. 2725-11/17 |
同様の部品番号 - LA1145M |
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同様の説明 - LA1145M |
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