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參數資料
| 型號： | LA1784M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | QIP-64 |
| 文件頁數： | 2/50頁 |
| 文件大小： | 568K |
| 代理商： | LA1784M |
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No. 6039-10/50
LA1784M
Pin No.
Function
Description
Equivalent circuit
23
+
–
+
–
+
–
4.9 V
50 k
150
50F
1.3 V
10 k
51 k
STOP
IF
BUFF.
Forced
SD: 2.5 V
SEEK
5 V
SD circuit
SW
VCC
AM MUTE
IF counter
buffer
A11724
32
24
10 k
10 k
VCC
FM
S-meter
AM
S-meter
AM/FM
SW
AM/FM
SW
MRC
Outputs a 1-mA
current during AM
reception
A11725
26
100 k
VDD
AM/FM
SD
Stereo
indicator
Seek/stop
switching
A11726
Continued from preceding page.
Continued on next page.
This pin functions both as the IF
counter buffer (AC output) and as
the seek/stop switch pin.
The voltage V23 switches
between the following three
modes.
23
IF counter buffer seek/stop
During FM reception:
switching
5 V:
Seek mode
2.5 V: Forced SD mode
0 V:
Reception mode
AM reception
(two modes: 0 and 5 V)
5 V:
Seek mode
0 V:
Reception mode
24
AM/FM signal meter
Fixed-current drive signal meter
output
In AM mode, pin 32 outputs a
32
Dedicated FM signal meter
1-mA current. Thus the HCC
circuit is turned off.
The voltage V23 switches
between three modes as follows.
FM reception:
5 V:
The SD pin operates linked
to the IF counter buffer.
26
Stereo indicator for the SD pin
2.5 V: Forced SD mode: operates
as the SD pin.
0.7 V: Reception mode: stereo
indicator
AM reception: (two modes: 0 and 5 V)
5 V:
Operates as the seek SD pin.
0 V:
Reception mode. Not used.
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