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參數資料
| 型號： | LA1784M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | QIP-64 |
| 文件頁數： | 35/50頁 |
| 文件大小： | 568K |
| 代理商： | LA1784M |
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19
5 k
0.047
F
C
To the
subdecoder
A12093
20 k
Larger
A12094
Separation adjustment (pin 19)
The separation is adjusted by modifying the input level to the subdecoder with the variable resistor connected to
pin 19. Since only the sub-modulation level is changed by changing the variable resistor setting, the monaural
(main) output level is not changed. Furthermore, degradation of high band separation in the decoder can be avoided
if the impedance of the external capacitor (C) in the subchannel frequency band (23 to 53 kHz) is made sufficiently
smaller than the variable resistor.
No. 6039-40/50
LA1784M
Fig. 49
+
24
S-meter
32
27
FM
S-meter
MRC
6.4 k
10 k
30 k
3.6 k
75 pF 1 k
DC buffer
VCC
2
A
100
QMRC
C27
VCC
To the SNC, pin 28
Noise amplifier
High-pass filter with
Fc = 70 kHz + amplifier
An external transistor equivalent
to the 2SC536 is required
Reason: A QMRC level shifter is
required to allow a simplified MRC
circuit to be used in the LA1781M.
A11768
9. MRC Circuit
Fig. 50
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