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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)： | 2/48頁 |
| 文件大小： | 508K |
| 代理商： | LA1781M |
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LA1781M
No.6038-10/48
Continued from preceding page.
Pin No.
Pin function
Pin description
Equivalent circuit
24
32
AM/FM signal meter
Dedicated FM signal meter
Fixed-current drive signal meter
output.
In AM mode, pin 32 outputs a
1mA current. Thus the HCC
circuit is turned off.
32
24
10k
Ω
10k
Ω
VCC
FM
S-meter
AM
S-meter
AM/FM
SW
AM/FM
SW
MRC
Outputs a 1-mA
current during AM
reception
26
Stereo indicator for the SD pin
The voltage V23 switches between
three modes as follows.
FM reception :
5V :
The SD pin operates linked
to the IF counter buffer.
2.5V : Forced SD mode: operates
as the SD pin.
0.7V : Reception mode: stereo
indicator
AM reception : (two modes : 0 and 5V)
5V :
Operates as the seek SD pin.
0V :
Reception mode. Not used.
26
100k
Ω
VDD
AM/FM
SD
Stereo
indicator
Seek/stop
switching
27
MRC control voltage time
constant
The MRC detector time constant is
determined by a 100
Ω resistor and C2
when discharging and by the 2
μA
current and C2 when charging.
+
27
2
μA
100
Ω
C2
VCC
Pin 28
28
SNC control input
The sub-output is controlled by a 0 to
1V input.
28
VREF
Continued on next page.
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