參數(shù)資料
型號: LA1781M
元件分類: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封裝: 14 X 14 MM, QIP-64
文件頁數(shù): 33/48頁
文件大?。?/td> 508K
代理商: LA1781M
LA1781M
No.6038-39/48
Separation adjustment (pin 19)
Fig. 49
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 53kHz) is made sufficiently smaller
than the variable resistor.
9. MRC Circuit
Fig. 50
19
5k
Ω
0.047
μF
C
To The
subdecoder
20k
Ω
Larger
+
24
S-meter
32
27
FM
S-meter
MRC
6.4k
Ω
10k
Ω
30k
Ω
3.6k
Ω
75pF 1k
Ω
DC buffer
VCC
2
μA
100
Ω
QMRC
C27
VCC
To the SNC, pin 28
Noise amplifiter
High-pass filter with
Fc = 70 kHz + amplifiter
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.
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