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參數(shù)資料
| 型號(hào)： | LA1260 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | FM/AM Tuner System for Radio-Casette Recorders, Music Centers |
| 中文描述： | 調(diào)頻/調(diào)幅調(diào)諧器系統(tǒng)的無線電Casette錄像機(jī)，音樂中心 |
| 文件頁(yè)數(shù)： | 4/14頁(yè) |
| 文件大?。?/td> | 924K |
| 代理商： | LA1260 |
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LA1260
No.1506-4/14
How to apply FM AFC
The S curve at the FM output pin (pin 8) is as shown in Figure 1. Therefore, the domestic (Japan) band (lower local
oscillation) use and foreign band (upper local oscillation) use differ as shown in Figures 2 and 3.
AM local oscillation
Since the LA1260 contains an ALC circuit, the oscillation level at pin 16 can be limited to 60 to 150mV in the
following applications where a coil is used.
Stable oscillation occurs at a coil impedance of 5k
or greater viewed from across pins 16 and 15. Turn ratio n and
Q
O
must be determined so that the oscillation level at pin 16 becomes 75mV or greater for MW use and 60mV or
greater for SW use.
If turn ratio n is increased more than needed, the oscillation level at pin 16
drops, thereby lowering the maximum sensitivity as shown in Figure 5 and 6.
Figure 7 shows the relation between turn ratio n and oscillation level at pin
16 in the MW band.
Unit (capacitance : F)
Figure 1
Figure 2 Domestic (lower local
oscillation) band
Figure 3 Foreign (upper local
oscillation) band
Unit (resistance :
, capacitance : F)
Unit (capacitance : F)
OSC injection voltage at pin 16 – mV
M
S
U
S
M
S
U
S
OSC injection voltage at pin 16 – mV
21MHz reception mode
f
r
=1000kHz reception
Maximum sensitivity
(input at detection
output –30dBm)
Maximum sensitivity
(input at detection
output –30dBm)
Usable sensitivity (S/N=20dB)
Usable sensitivity
(S/N=20dB)
Figure 5
Figure 6
Figure 4
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