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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(wú)線電Casette錄像機(jī)，音樂(lè)中心 |
| 文件頁(yè)數(shù)： | 5/14頁(yè) |
| 文件大小： | 924K |
| 代理商： | LA1260 |
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LA1260
No.1506-5/14
AM oscillation coil
Generally speaking, the following should be noted. Winding with loose
coupling between 1 and 2 and between 1 and 3 must be avoided. (Particularly
SW1, SW2).
To put in concretely, the pot core type is better than the screw core type which
is loose in coupling. This prevents the local oscillation frequency from turning
third resonance frequency related to the coupling coefficient.
LED unlighted time and distortion in AM (MW)
By increasing the value of the electrolytic capacitor for AGC at pin 11 (Figure 8), the distortion in the AM mode can
be improved, but the LED unlighted time is made longer. 10μF is recommended for obtaining the optimum LED
unlighted time and distortion. The LED unlighted time is 200ms at this value (Approximately 400ms at 22μF).
FM-AM selection and dc level at pin 12
(1) Pin 12-used method=recommended circuit
The FM mode is entered with pin 12 open. When pin 12 and pin 6
are at the same potential in terms of DC, the AM circuit is turned on
by the internal switch. It should be noted that the dynamic range is
narrowed whether the potential at pin 12 is lower or high than that
at pin 6.
(2) Pin 13-used method
The AM mode is entered with pin 13 open. When pin 13 is
grounded, the FM circuit is turned on and the AM circuit is turned
off by the internal switch. In this case, pin 12 and pin 6 (V
CC
) are
at the same potential.
Unit (capacitance : F)
Receiving frequency, f
r
– Hz
O
O
V
Figure 7
MW OSC characteristic
Modulation degree – %
T
Figure 8
Input 100dBm
V
=4.5V
AM mod. char. and electrolytic
capacitor at pin 11.
100Hz capactoracrosspn11andGnd:10μF
V
O
Relation between turn
ration n and OSC level
Unit (capacitance : F)
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