LA1145 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA1145

FM IF System (Quadrature Detector) for Car Radio

SANYO -> Panasonic 

LA1145, 1145M

SD Output Circuit

1. LA1145 SD output differs from the LA1140’s pin substitute SD output as shown below. The SD output on the LA1145 does

not operate in conjunction with the soft mute characteristics.

1) LA1140

Hole detector

Signal meter

Mute driver

Band mute

output

2) LA1145

Hole detector

Signal meter

Bandmute

Mute driver

Comparator

Exhibit hysteresis

output

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 15, 16, 17 and 8.

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 8)

An equivalent circuit to the band circuit is shown below.

Mute switch circuit

No. 2725-9/17

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