参数资料
型号: LA1776M
元件分类: 调谐器
英文描述: 2-BAND, AUDIO TUNER, PQFP64
封装: 14 X 14 MM, QFP-64
文件页数: 5/41页
文件大小: 547K
代理商: LA1776M
Pin No.
Pin
Description
Equivalent circuit
No.8085-13/41
LA1776M
Continued on next page.
Continued from preceding page.
23
3.3 V
1.3 V
3.3 V
51 k
STOP
2.5 V/5V
AM SD
FM SD
+
+
+
23
IF counter buffer
seek/stop switching
This pin functions both as the IF counter buffer (AC
output) and as the seek/stop switch pin.
FM mode
5 V (high): Seek mode
2.5 V: High-speed SD mode
0 V (low): Reception mode
AM mode
5 V (high): Seek mode
0 V (low): Reception mode
32
24
10 k
10 k
VCC
FM
S-meter
AM
S-meter
AM/FM
SW
24
32
AM/FM signal meter
Dedicated FM signal
meter
Fixed-current drive signal meter output
27
7
A
100
C2
VCC
28 pin
+
27
MRC output
The MRC detector time constant is determined by a
100
resistor and C2 when discharging and by the
7-A current and C2 when charging.
30 k
C1
Dedicated MRC
S-meter voltage
R2
26
+
26
MRC AC input
The LA1776M supports two methods: detecting IF S-
meter wideband components and detecting the
noise canceller high-pass filter noise output.
The noise amplifier gain is determined by R2 and the
internal 30 k
resistor as shown in the figure. Note
that the frequency characteristics are determined by
C1.
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