参数资料
型号: LA1787M-MPB-E
厂商: ON Semiconductor
文件页数: 13/54页
文件大小: 0K
描述: IC CAR RADIO TUNER 64QFP
标准包装: 60
频率: 520kHz ~ 1.71MHz,64MHz ~ 108MHz
调制或协议: AM,FM
应用: 车载音频
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
电源电压: 8V
工作温度: -40°C ~ 85°C
封装/外壳: *
供应商设备封装: *
包装: *
LA1787M
Continued from preceding page.
Pin No.
Function
Description
0.1 μ F
VREF
Equivalent circuit
R1
VCC
C
37
R2
36
35
34
?The resistor R 1 determines the
width of the band muting function.
Increasing the value of R 1
narrows the band.
Reducing the value of R 1 widens
the band.
VCC
Quadrature
detector
34
AGC
35
36
QD output
QD input
?Null voltage
When tuned, the voltage between
37
V REF
pins 34 and 37, V 34 – 37 , will be 0 V.
The band muting function turns
HOLE
DET
3pF
on when |V 34 – 37 | ≥ 0.7 V.
V 37 = 4.9 V
IF limitter amplifier
1k ?
Band
muting
A13577
A 130-μA current flows from pin
38
R
SD ADJ
38
FM SD ADJ
38 and, in conjunction with the
external resistance R, determines
130 μ A
the comparison voltage.
+
SD
Comparator
24
S-meter
A13578
The keyed AGC operates when
S-meter
6.4k ?
3.6k ?
24
the voltage created by dividing the
pin 24 S-meter output voltage by
Comparator
39
Keyed AGC
AM stereo buffer
the 6.4 and 3.6 k ? resistors
becomes lower than the voltage
determined by the resistor
between pin 39 and ground.
KEYED
AGC
+
1.3V
VCC
90 μ A
39
This pin also is used as the AM
stereo IF buffer pin.
AM IF out
50pF
150 ?
A13579
Continued on next page.
No. 6655-13/54
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