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參數(shù)資料
| 型號： | LA3410 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | VCO Non-Adjusting PLL FM MPX Stereo Demodulator with FM Accessories(帶FM附件VCO無需調(diào)整PLL FM MPX立體聲解調(diào)器) |
| 中文描述： | 壓控振蕩器非盈豐調(diào)整鎖相環(huán)調(diào)頻立體聲調(diào)頻解調(diào)器與配件（帶調(diào)頻附件壓控振蕩器無需調(diào)整盈豐鎖相環(huán)調(diào)頻立體聲解調(diào)器） |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 449K |
| 代理商： | LA3410 |
LA3410
No.1407–6/13
(2) PLL loop filter constants
(a) The capture range of the LA3410 depends pri-
marily on input pilot level and PLL loop filter
constants C9 and R8 as shown in Fig. 4-A.
It is necessary to set C9 and R8, with the in-
put pilot level considered, so that the capture
range becomes wide but the stereo distortion
is kept rather low. The transfer function of the
loop filter is given by :
Lag filter F (S)=
Lag Lead filter F (S)=
R0 : IC internal resistance
and the response is given by Fig.4-B. The cap-
ture range may be made wide by the follow-
ing methods.
Set 3 high to make the band width wide (De-
crease C9).
Increase the high frequency gain F (
∞
) so long
as the characteristic of the Lag Lead filter is
not lost (Increases R8).
Fig. 4-C shows the capture range characteris-
tic when C9 and R8 are varied. When R8 is
increased, the capture range will increase to a
certain point. R8 must be set in this range.
When R8 is increased, the STEREO-L, R dis-
tortion may worsen at low frequencies (100
to 400Hz). In this case, connect a capacitor of
200 to 1000pF across pin 3 and GND to im-
prove the STEREO-L, R distortion (Refer to
Fig. 5).
(3) Fig. 4-D shows the capature range characteris-
tic when C10 is varied. The adequate value of
C10, which depends on C9 and R8, is 0.33 to
3.3
μ
F. If the value of C10 is decreased too
much, the capture range will decrease as seen
from Fig. 3 ; and if increased too much, the
stereo start time after VCO STOP release will
be made late.
1
SC9R0+1
SC10R8+1
SC10 (R0+R8)+1
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