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參數(shù)資料
| 型號(hào)： | LA1867NM |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Car Radio Single-Chip Tuner System |
| 中文描述： | 汽車無(wú)線電單芯片調(diào)諧器系統(tǒng) |
| 文件頁(yè)數(shù)： | 19/32頁(yè) |
| 文件大?。?/td> | 941K |
| 代理商： | LA1867NM |
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3. FM muting on: Pin 33 (R33 = 100 k
)
The –3 dB limiting sensitivity can be changed by varying R
33
.
(Currently, R33 is 25 k
to set the –3 dB limiting sensitivity to 8 dBμ.)
4. FM muting attenuation adjustment: Pin 22 (R22 is a 30 or 50 k
variable resistor)
The pin 23 voltage is divided by the R
22
variable resistor and input to pin 22. The no-input noise convergence is
determined by value of the pin 22 voltage.
(The LA1867NM has a noise convergence design target of from 5 dB to 30 dB.)
5. Muting time constant
The LA1867NM allows the volume level to be changed gradually for field variations during weak field reception by
setting the attack and recovery times for the soft mute function.
6. FM mute off function
The muting function is turned off if pin 22 is forcibly connected to ground.
No. 4619-19/32
LA1867NM
Attack time setting
ta = R
23
*
C
22
= 940 μsec
Recovery time setting
tr = C
22
*
R
23
= 23500 μsec
Unit (resistance:
, capacitance: F)
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