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ULA1145 Datasheet(PDF) 7 Page - Unisonic Technologies |
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ULA1145 Datasheet(HTML) 7 Page - Unisonic Technologies |
7 / 10 page ULA1145 Preliminary CMOS IC UNISONICTECHNOLOGIESCO.,LTD 7 of 10 www.unisonic.com.tw QW-R106-006.a SD OUTPUT CIRCUIT 1. Hole detector Signal meter Bandmute Comparator 18 Exhibit hysteresis Mute driver 19 SD output 16 As shown, the SD output is the logical AND of the band mute and S-meter comparator outputs. 2. Signal search using the SD output circuit 2-1 The transition response characteristics of the SD output circuit depends on the time constants of pins 16, 17, 18 and 9. As the SD output transition response characteristics are determined by the pin with the largest time constant, erroneous stopping will result when a search time is less than the largest one. 2-2 Band mute range circuit time constant (pin 9) An equivalent circuit to the band circuit is shown below. 9 12 C RAFC VREF Mute switch circuit |
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