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参数资料
| 型号： | LA1787M |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封装： | 14 X 14 MM, QFP-64 |
| 文件页数： | 4/54页 |
| 文件大小： | 606K |
| 代理商： | LA1787M |
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No. 6655-12/54
LA1787M
Pin No.
Function
Description
Equivalent circuit
31
30
+
VCC
10k
FM
detector
output
AM
detector
Noise
canceller
1
F
50k
4.2V
A13574
+
32
VCC
10k
1k
1
F
A13575
MRC input
+
33
HOLE
DET
SOFT
MUTE
Band
muting
SEEK
OFF
VCC
0.1
F
C1
50k
10k
50k
MUTE
AMP.
SD circuit
A13576
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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| LA1787M_09 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Single-Chip Tuner IC for Car Radios |
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