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參數資料
| 型號： | LA3410 |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PDIP16 |
| 封裝： | DIP-16 |
| 文件頁數： | 10/13頁 |
| 文件大小： | 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
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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