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參數(shù)資料
| 型號： | LA1235 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | FM IF System Applications |
| 中文描述： | 調(diào)頻中頻系統(tǒng)應(yīng)用 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 1031K |
| 代理商： | LA1235 |
LA1235
No.873-4/12
Setting of muting sensitivity, hysteresis width (Refer to the
equivalent circuit block diagram and application circuit).
Muting sensitivity and hysteresis width are set arbitarily by
varying resistors R
204
and R
205
connected to pins 15 and 16,
respectively. Muting sensitivity is set by varying R
204
; and
if R
204
is made larger, muting sensitivity will shift to the
weak signal side. Hysteresis width is set by varying R
205
;
and if R
205
is made larger, hysteresis width will narrow.
Next, how to set muting sensitivity is concretely described as
follows. In case of using R
204
=50k
(semifixed resistor)
and R
205
=56k
, the upper limit of current I
16
, 50μA,
delivered from the signal meter driver at which muting is
turned ON is obtained from the first quadrant of Table for
muting adjustable lower limit calculation. Muting is turned
ON at I
16
≤
50μA. If I
16
≤
50μA, muting is already turned ON
at a point of input being stronger than the setting input and it
is impossible to adjust muting at the setting input. Therefore,
I
16
>50μA is required at the setting input. The input at which
a sample with a small I
16
output meets 50μA is obtained as
V
IN
=47dBμ. This input is the maximum value of muting
sensitivity, that is to say, the lower limit at with muting can
be set. The data for sample with a Small I
16
shown in this
Table is colose to the minimum value, but since samples
with values less than this munimum value may occur, a
margin of some dBμ must be allowed. From the above, the
minimum value for muting setting (muting ON input)
becomes 50dBμ for R
204
(semifixed resistor)=50k
and
R
205
=56k
.
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