參數(shù)資料
型號: 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): 9/41頁
文件大小: 547K
代理商: LA1776M
No.8085-17/41
LA1776M
Continued on next page.
Continued from preceding page.
40
VCC
IF, NC, MPX, VCC
42
DET
VCC
3.3 k
3.3 k
30 k
30 k
30 k
19 kHz
∠0
BIAS
1
F
1 k
C
1k
+
+
42
Pilot detector
AM L.C
This pin us used for both FM pilot detection and AM
low-cut filter.
Pilot detection
The system is forced to mono mode when a 1 M
resistor is inserted between pin 42 and ground. In
AM mode, the frequency characteristics of the
unneeded audio band below 100 Hz are modified
producing a clear audio signal.
AM low-cut filter
The cutoff frequency fC can be determined from the
following formula.
FC = 1/2 π × 3.3 k × C
0.8 V
Vsm
N-AGC
43
1 k
1 k
+
43
Keyed AGC
Dedicated keyed AGC S-meter
The keyed AGC function starts operation when V43
becomes less than or equal to 0.8 V. (Narrow AGC
off mode.)
24
38
SD
R
SD Adj
Vsm
4 V
Comparator
S-meter
20 k
+
41
FM SD
The comparison voltage is controlled by an external
resistor.
In seek mode, the seek operation will stop when V41
< Vsm.
Pin No.
Pin
Description
Equivalent circuit
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