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参数资料
| 型号： | LA1784M |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封装： | QIP-64 |
| 文件页数： | 4/50页 |
| 文件大小： | 568K |
| 代理商： | LA1784M |
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No. 6039-12/50
LA1784M
Pin No.
Function
Description
Equivalent circuit
31
30
+
AM
detector
FM
detector
output
VCC
10 k
1
F
Noise
canceller
50 k
4.2 V
A11730
+
32
VCC
10 k
MRC input
1 k
1
F
A11731
+
33
HOLE
DET
SOFT
MUTE
Band
muting
SEEK
OFF
VCC
0.1
F
C1
50 k
10 k
50 k
MUTE
AMP.
SD circuit
A11732
Continued from preceding page.
Continued on next page.
30
Noise canceller input
Pin 30 is the noise canceller input.
The input impedance is 50 k
.
Pin 31 is the AM and FM detector
output
In FM mode, this is a low-
impedance output.
31
AM/FM detector output
In AM mode, the output
impedance is 10 k
.
To improve the low band
separation, use a coupling
capacitor of over 10 F.
FM S-meter output block
32
IF S-meter output and MRC
MRC AC input block
DC input
Adjust the external 1-k
resistor
to attenuate the MRC AC input
and control the circuit.
The muting time constant is
determined by an external RC
circuit as described below.
Attack time: TA = 10 k × C1
Release time: TR = 50 k × C1
Noise convergence adjustment
33
Mute drive output
The noise convergence can be
adjusted when there is no input
signal by inserting a resistor
between pin 33 and ground.
Muting off function
Ground pin 33 through a 4-k
resistor.
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