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| 型號： | LA1245 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | AM Electronic Tuner |
| 中文描述： | 上午電子調(diào)諧器 |
| 文件頁數(shù)： | 3/11頁 |
| 文件大小： | 326K |
| 代理商： | LA1245 |
LA1245
No.737-3/11
Using the automatic search-stop signal
Signal Meter-driving output circuit is equivalent to Figure. 1, signal meter driving output (abbreviated as V
SM
) is
narrowed in band width and can be used as an automatic search-stop signal when a narrow band series resonator is
connected to pin 15. V
SM
can be adjusted with R
208
and R
211
both in wide band and narrow band since R
208
is
inversely proportional to V
SM
, while R
211
is proportional to V
SM
. R
208
is related to the Q of narrow band signal
meter. When the resistance of R
208
is increased, the Q will be damped and the band width increased. On the other
hand, R
211
used as the output impeadance of V
SM
and affects the cut-off frequency and time constant of low pass
filter for V
SM
and the meter drive impedance. The time constant
τ
and the cut-off frequency fc can be expressed as
follows :
τ
= (C
114
+C
115
+C
S
) (R
211
//Rin)
fc = 2
π
τ
A semi-fixed resistor is recommended to be used as R
211
to cope with the fluctuation of V
SM
. Refer to Figure. 3 for
the value of the semi-fixed resistor since this depends upon V
SM
and R
208
. Figure. 3 shows the lowest limit of the
semi-fixed resistor in relation to R
208
with the parameter of V
SM
set point, and the value of the semi-fixed resistor
will be equal to or greater than that shown in Figure. 3. For example, when V
SM
=5V and R
208
=240
, R
211
becomes
28k
. Thus, the value of the semi-fixed resistor is determined to be about 30k
. When the value of V
SM
is too large,
it is limited and saturated to the source voltage so it is recommended to follow the condition of V
SM
≤
V
CC
–2(V).
When a narrow band serial resonator is used, include the resonant impedance to determine the value of R
208
.
1
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| LA125P | 制造商:LEM 制造商全稱:LEM 功能描述:CURRENT TRANSDUCER LA 125-P |
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