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參數(shù)資料
型號(hào): LA1776M
廠商: SANYO SEMICONDUCTOR CO LTD
元件分類: 調(diào)諧器
英文描述: 2-BAND, AUDIO TUNER, PQFP64
封裝: 14 X 14 MM, QFP-64
文件頁數(shù): 13/41頁
文件大小: 547K
代理商: LA1776M
No.8085-20/41
LA1776M
Continued on next page.
Continued from preceding page.
54
49
OSC
VCC 40 pin
40 pin VCC
10 k
10.7 M
54
49
AM MIX OUT
AM MIX IN
The mixer coil connected to the pin 54 mixer output
must be wired to VCC (pin 40).
The pin 49 mixer input impedance is 10
55
58
W-AGC
20 k
1.5 k
N-AGC
62 pin
VCC
30 pF
50 pF
S-meter
AM SD
C1
C2
MIX
IN
MIX
OUT
+
58
W-AGC IN
AM-SD Adj
N-AGC IN
Pins 55 and 58 include built-in DC cut capacitors.
The AGC on level is determined by the values of the
capacitors C1 and C2.
Pin 55 functions as the SD sensitivity adjustment pin
in AM mode.
V55 is changed by the value of the external resistor.
SD is operated by comparing V55 with the S-meter
voltage.
Seek mode stop condition: V55 < Vsm
48
VCC
50 pF
100
20 k
ANT DAMPING
DRIVER
W.AGC AMP.
FM Vsm
I48
0.022
F
48
AM antenna damping
drive output
Wideband AGC input
FM S-meter voltage shift
I48 = 6 mA
Antenna damping current
Resistor values under 5 k
cannot be used for the
FM S-meter shift resistor.
Pin No.
Pin
Description
Equivalent circuit
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