参数资料
型号: LA1781M
元件分类: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封装: 14 X 14 MM, QIP-64
文件页数: 3/48页
文件大小: 508K
代理商: LA1781M
LA1781M
No.6038-11/48
Continued from preceding page.
Pin No.
Pin function
Pin description
Equivalent circuit
29
HCC control input
The high band frequency output is
controlled by a 0 to 1V input.
It can also be controlled by the MRC
output.
Use a resistor of at least 100k
Ω when
controlling with the pin 32 FM S-meter
signal.
+
32
1
μF
29
VREF
30
31
Noise canceller input
AM/FM detector output
Pin 30 is the noise canceller input.
The input impedance is 50k
Ω.
Pin 31 is the AM and FM detector
output
In FM mode, this is a low-impedance
output.
In AM mode, the output impedance is
10k
Ω.
To improve the low band separation,
use a coupling capacitor of over 10
μF.
31
30
+
AM
detector
FM
detector
output
VCC
10k
Ω
1
μF
Noise
canceller
50k
Ω
4.2V
32
IF S-meter output and MRC
DC input
FM S-meter output block
MRC AC input block
Adjust the external 1k
Ω resistor to
attenuate the MRC AC input and
control the circuit.
+
32
VCC
10k
Ω
MRC input
1k
Ω
1
μF
Continued on next page.
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