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: 4/48页
文件大小: 508K
代理商: LA1781M
LA1781M
No.6038-12/48
Continued from preceding page.
Pin No.
Pin function
Pin description
Equivalent circuit
33
Mute drive output
The muting time constant is
determined by an external RC circuit
as described below.
Attack time : TA = 10kΩ × C1
Release time : TR = 50kΩ × C1
Noise convergence adjustment
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 4k
Ω
resistor.
+
33
HOLE
DET
SOFT
MUTE
Band
muting
SEEK
OFF
VCC
0.1
μF
C1
50k
Ω
10k
Ω
50k
Ω
MUTE
AMP.
SD circuit
34
35
36
37
AGC
QD output
QD input
VREF
The resistor R1 determines the width
of the band muting function.
Increasing the value of R1 narrows
the band.
Reducing the value of R1 widens the
band.
Null voltage
When tuned, the voltage between
pins 34 and 37, V34 - 37, will be 0V.
The band muting function turns
on when |V34 - 37| ≥ 0.7V.
V37 = 4.9V
37
36
35
34
HOLE
DET
Band
muting
Quadrature
detector
0.1
μF V
REF
R1
R2
VCC
C
390
Ω
1k
Ω
3pF
IF limiter amplifier
38
FM SD ADJ
A 130
μA current flows from pin 38
and, in conjunction with the external
resistance R, determines the
comparison voltage.
24
38
+
--
SD
R
SD ADJ
130
μA
Comparator
S-meter
Continued on next page.
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