參數(shù)資料
型號: LA17000M
元件分類: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP80
封裝: 14 X 14 MM, QFP-80
文件頁數(shù): 35/54頁
文件大小: 830K
代理商: LA17000M
LA17000M
No. 6522-40/54
Continued from preceding page.
Pin No.
Function
Equivalent circuit
Description
69
72
78
70
MIX output 130
A
65
MIX input
71
W-AGC IN
AM SD Adjust
74
N-AGC IN
mute attenuation
adjusting pin
A13362
A13363
Continued on next page.
A13364
1ST.IF amplifier I/O pin
Inversion amplifier
V78 = 2 V Narrow 1st IF input
V72 = 2 V Wide 1st IF input
Input impedance
RIN = 330
V59 = 5.3 V
Output impedance
ROUT = 330
When SW1 open, SW2 short
When SW1 short, SW2 open
Switched by the CF band, switched
by voltage on pin 10.
Pin 71, 74 DC cut capacitors are on
chip.
The AGC on level is determined by
the capacitance of C1 and C2.
Pin 71 is the SD sensitivity adjusting
pin for AM.
Output current I71 = 50
A, and V71
varies according to the external
resistance.
SD is put into operation by
comparing V71 with the S-meter
voltage.
Wire the MIX coil that is connected to
the pin 70 MIX output to pin 56
(VCC).
Pin 65 MIX input.
Input impedance
330
Pin 56
VCC
VCC pin 56
Pin 77
VCC
S-meter
IF amplifier output
IF amplifier input wide
input
IF amplifier input
narrow input
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