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参数资料
| 型号： | LA1784M |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封装： | QIP-64 |
| 文件页数： | 5/50页 |
| 文件大小： | 568K |
| 代理商： | LA1784M |
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No. 6039-13/50
LA1784M
Pin No.
Function
Description
Equivalent circuit
37
36
35
34
HOLE
DET
Band
muting
Quadrature
detector
A11733
0.1
F V
REF
R1
R2
VCC
C
390
1 k
3 pF
IF limitter amplifier
24
38
+
–
SD
R
SD ADJ
130
A
Comparator
S-meter
A11734
24
39
+
–
KEYED
AGC
S-meter
A11735
6.4 k
3.6 k
Comparator
1.3 V
50 pF
150
90
A
VCC
AM IF out
Continued from preceding page.
Continued on next page.
The resistor R1 determines the
width of the band muting function.
Increasing the value of R1
narrows the band.
Reducing the value of R1 widens
the band.
34
AGC
35
QD output
Null voltage
36
QD input
When tuned, the voltage between
37
VREF
pins 34 and 37, V34 – 37, will be 0 V.
The band muting function turns
on when |V34 – 37| ≥ 0.7 V.
V37 = 4.9 V
A 130-A current flows from pin
38
FM SD ADJ
38 and, in conjunction with the
external resistance R, determines
the comparison voltage.
The keyed AGC operates when
the voltage created by dividing the
pin 24 S-meter output voltage by
the 6.4 and 3.6 k
resistors
39
Keyed AGC
becomes lower than the voltage
AM stereo buffer
determined by the resistor
between pin 39 and ground.
This pin also is used as the AM
stereo IF buffer pin.
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